The Siberian State Academy of Mining and Metallurgy together with the joint-stock company of the West-Siberian Metallurgical Works and UralNIIStromprojekt have developed compositions and technology for fireproof concrete made from local materials and industrial by-products. The concrete is designated for the production of unburnt blocks and bricks to be used for lining heating facilities of metallurgical enterprises (there are four of them in Novokuznetsk). Concrete for producing blocks for soaking pits consists of the following components: quartzites of three grading fractions (0 to 8 mm - 36%, 0 to 3 mm - 50%, powder fraction - 14%) and a binder (technical grade liquid glass) with a density of 1.42 to 1.44 g/sq cm (10-14% above 100% aggregate). The technical grade liquid glass was made by solution of silica fume with the fineness of 60 to 90 sq m/g and beyond 90% free SiO2 content in sodium hydroxide. The technical grade liquid glass developed increased the strength of concrete and its heat resistance by 35 to 45% and 25 to 30%, respectively, as compared with the commonly used liquid glass. The service life of the blocks manufactured at the pilot plant of the West-Siberian Metallurgical Works in walls of a soaking pit was 18 months, while that of the blocks produced by the Pervouralsky plant ranges from 6 to 12 months. The construction of a department for producing blocks and bricks from the above concrete is in the stage of completion at the West-Siberian Steel Works.
{"title":"Fireproof Concrete for Lining of Soak Pits","authors":"S. Pavlenko, A. Permyakov, Yu. N. Pronyakin","doi":"10.14359/6055","DOIUrl":"https://doi.org/10.14359/6055","url":null,"abstract":"The Siberian State Academy of Mining and Metallurgy together with the joint-stock company of the West-Siberian Metallurgical Works and UralNIIStromprojekt have developed compositions and technology for fireproof concrete made from local materials and industrial by-products. The concrete is designated for the production of unburnt blocks and bricks to be used for lining heating facilities of metallurgical enterprises (there are four of them in Novokuznetsk). Concrete for producing blocks for soaking pits consists of the following components: quartzites of three grading fractions (0 to 8 mm - 36%, 0 to 3 mm - 50%, powder fraction - 14%) and a binder (technical grade liquid glass) with a density of 1.42 to 1.44 g/sq cm (10-14% above 100% aggregate). The technical grade liquid glass was made by solution of silica fume with the fineness of 60 to 90 sq m/g and beyond 90% free SiO2 content in sodium hydroxide. The technical grade liquid glass developed increased the strength of concrete and its heat resistance by 35 to 45% and 25 to 30%, respectively, as compared with the commonly used liquid glass. The service life of the blocks manufactured at the pilot plant of the West-Siberian Metallurgical Works in walls of a soaking pit was 18 months, while that of the blocks produced by the Pervouralsky plant ranges from 6 to 12 months. The construction of a department for producing blocks and bricks from the above concrete is in the stage of completion at the West-Siberian Steel Works.","PeriodicalId":255305,"journal":{"name":"SP-179: Fourth CANMET/ACI/JCI Conference: Advances in Concrete Technology","volume":"214 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115466361","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
When high-strength concretes are conveyed by pumping, the pumping pressure may increase and the flowability of high-fluidity concrete may be greatly decreased. This is a problem for construction of concrete-filled tubular steel columns. In this study, pumping tests and filling tests of steel tubular model columns with several kinds of high-fluidity concrete having a water/cement ratio of 30% were conducted. Silica fume results in better pumpability. The pressure loss reflects good correlation to the plastic viscosity of the concrete calculated from the time taken for it to discharge from an inverted slump cone. When the concretes used in the tests were pumped into tubular columns, the cavity area under the diaphragm plates was less than 10% and the core strength obtained at 91 days was over 80 N/sq mm. If the slump flow of concrete at the top of the column is more than 45 cm, it can be expected that the column will be filled well. The pressure of concrete at the bottom of the column is approximately 1.2 times the head pressure.
{"title":"Application of High-Strength Concrete to Fill Tubular Steel Columns","authors":"S. Kuroiwa, K. Kuroha, M. Hayakawa, K. Watanabe","doi":"10.14359/6050","DOIUrl":"https://doi.org/10.14359/6050","url":null,"abstract":"When high-strength concretes are conveyed by pumping, the pumping pressure may increase and the flowability of high-fluidity concrete may be greatly decreased. This is a problem for construction of concrete-filled tubular steel columns. In this study, pumping tests and filling tests of steel tubular model columns with several kinds of high-fluidity concrete having a water/cement ratio of 30% were conducted. Silica fume results in better pumpability. The pressure loss reflects good correlation to the plastic viscosity of the concrete calculated from the time taken for it to discharge from an inverted slump cone. When the concretes used in the tests were pumped into tubular columns, the cavity area under the diaphragm plates was less than 10% and the core strength obtained at 91 days was over 80 N/sq mm. If the slump flow of concrete at the top of the column is more than 45 cm, it can be expected that the column will be filled well. The pressure of concrete at the bottom of the column is approximately 1.2 times the head pressure.","PeriodicalId":255305,"journal":{"name":"SP-179: Fourth CANMET/ACI/JCI Conference: Advances in Concrete Technology","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134279936","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Measuring sensors made of ceramic have been studied for measuring the moisture content of concrete. As a result, the moisture content distribution inside concrete has been clarified. Furthermore, a moisture content measuring sensor equipped with small stainless steel electrodes, measuring 0.7 mm in diameter and 20 mm in length, was developed for the current study to locally measure the moisture content distribution inside concrete, thereby examining the temperature, applied voltage, influence of metal near the electrodes, and the coefficient of variation of specific electrical resistance during the test.
{"title":"Method for Measuring Moisture Content in Concrete With Small Stainless Steel Electrodes","authors":"N. Yuasa, Y. Kasai, I. Matsui","doi":"10.14359/6058","DOIUrl":"https://doi.org/10.14359/6058","url":null,"abstract":"Measuring sensors made of ceramic have been studied for measuring the moisture content of concrete. As a result, the moisture content distribution inside concrete has been clarified. Furthermore, a moisture content measuring sensor equipped with small stainless steel electrodes, measuring 0.7 mm in diameter and 20 mm in length, was developed for the current study to locally measure the moisture content distribution inside concrete, thereby examining the temperature, applied voltage, influence of metal near the electrodes, and the coefficient of variation of specific electrical resistance during the test.","PeriodicalId":255305,"journal":{"name":"SP-179: Fourth CANMET/ACI/JCI Conference: Advances in Concrete Technology","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133278047","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
High volume waste concrete (HVWC) containing hundreds of kg of waste-derived materials in unit volume of concrete as raw materials was prepared to examine the workability, strength development, hydration of cement, composition and structure, and dissolution of harmful elements from hardened concrete to increase the amounts of waste-derived material that can be used for manufacturing concrete. The waste-derived materials tested in this experiment were incineration ash of urban refuse and sintered coal ash as the substitution for fine aggregates, and sintered sewage sludge and glass cullet as the substitution for coarse aggregates. It was determined that HVWC could keep good workability without segregation and developed higher strength than ordinary concrete even if the amounts of waste-derived aggregates in concrete exceeded 600 kg/cu m. Increase in combined water in hardened HVWC and the production of cement hydrates including C-S-H with age was normal and the influence of trace elements contained in waste-derived aggregates on the cement hydration was negligible. Decrease in the amounts of Ca(OH)2 and increase in C-S-H which was estimated from the pore volume of 3 to 6 mm in diameter was recognized in later age in the case when blast furnace slag or fly ash was used as a binder. Non-uniformity in distribution of aggregate, large pore and microgroove between aggregate and cement paste which might occur by the use of large amounts of waste-derived aggregate was not observed. There was no remarkable difference in type and quantity of elements between HVWC and ordinary concrete dissolved from them. From the results described above, it is considered that the use of HVWC is a very promising technique to safely consume large amounts of wastes.
高容量废弃混凝土(HVWC)在单位体积的混凝土中含有数百公斤的废物衍生材料作为原材料，用于检查可工作性、强度发展、水泥水化、成分和结构以及硬化混凝土中有害元素的溶解，以增加可用于制造混凝土的废物衍生材料的数量。本实验试验的废源材料为城市垃圾焚烧灰和烧结粉煤灰替代细骨料，烧结污泥和玻璃屑替代粗骨料。试验结果表明，即使混凝土中废骨料的掺量超过600 kg/cu m, HVWC仍能保持良好的和易性，且具有比普通混凝土更高的强度。随着龄期的增加，HVWC中结合水的增加和C-S-H等水泥水化产物的生成是正常的，废骨料中微量元素对水泥水化的影响可以忽略不计。用高炉矿渣或粉煤灰作为粘结剂时，随着年龄的增长，Ca(OH)2的含量减少，C-S-H的含量增加，这是由孔径3 ~ 6mm估算的。没有观察到骨料分布不均匀，骨料与水泥浆体之间存在大量废骨料可能产生的大孔隙和微槽。HVWC与普通混凝土在溶出元素的种类和数量上无显著差异。综上所述，我们认为利用高压捕集器是一种非常有前途的安全处理大量废物的技术。
{"title":"High Volume Wastes Concrete (HVWC)","authors":"H. Uchikawa, S. Hanehara, H. Hirao","doi":"10.14359/6029","DOIUrl":"https://doi.org/10.14359/6029","url":null,"abstract":"High volume waste concrete (HVWC) containing hundreds of kg of waste-derived materials in unit volume of concrete as raw materials was prepared to examine the workability, strength development, hydration of cement, composition and structure, and dissolution of harmful elements from hardened concrete to increase the amounts of waste-derived material that can be used for manufacturing concrete. The waste-derived materials tested in this experiment were incineration ash of urban refuse and sintered coal ash as the substitution for fine aggregates, and sintered sewage sludge and glass cullet as the substitution for coarse aggregates. It was determined that HVWC could keep good workability without segregation and developed higher strength than ordinary concrete even if the amounts of waste-derived aggregates in concrete exceeded 600 kg/cu m. Increase in combined water in hardened HVWC and the production of cement hydrates including C-S-H with age was normal and the influence of trace elements contained in waste-derived aggregates on the cement hydration was negligible. Decrease in the amounts of Ca(OH)2 and increase in C-S-H which was estimated from the pore volume of 3 to 6 mm in diameter was recognized in later age in the case when blast furnace slag or fly ash was used as a binder. Non-uniformity in distribution of aggregate, large pore and microgroove between aggregate and cement paste which might occur by the use of large amounts of waste-derived aggregate was not observed. There was no remarkable difference in type and quantity of elements between HVWC and ordinary concrete dissolved from them. From the results described above, it is considered that the use of HVWC is a very promising technique to safely consume large amounts of wastes.","PeriodicalId":255305,"journal":{"name":"SP-179: Fourth CANMET/ACI/JCI Conference: Advances in Concrete Technology","volume":"318 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132910494","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
K. Fujii, M. Kakizake, H. Edahiro, Y. Unisuga, Y. Yamamoto
Meeting the needs of urban development, high strength concrete has made remarkable progress where the standard concrete strength of 60 MPa level is attained with the help of high performance air entraining water-reducing agents. High strength lightweight concrete could be more advantageous with respect to the reduction of dead load and resulting construction cost reduction, and has been successfully applied to marine concrete constructions. This paper deals with the high strength, high fluidity lightweight concrete with bulk densities from 1.8 to 2.0 t/cu m and compressive strength from 60 to 90 MPa manufactured with belite-rich low heat cement and silica fume cement, and discusses the influences of materials and mixture proportions upon the properties of fresh and hardened concretes. Compressive strength with a water-cement ratio of 0.23 was 65 to 79 MPa when silica fume blended cement was used, and was 59 to 68 MPa when belite-rich low heat cement was used.
{"title":"Mixture Proportions of High-Strength and High-Fluidity Lightweight Concrete","authors":"K. Fujii, M. Kakizake, H. Edahiro, Y. Unisuga, Y. Yamamoto","doi":"10.14359/6052","DOIUrl":"https://doi.org/10.14359/6052","url":null,"abstract":"Meeting the needs of urban development, high strength concrete has made remarkable progress where the standard concrete strength of 60 MPa level is attained with the help of high performance air entraining water-reducing agents. High strength lightweight concrete could be more advantageous with respect to the reduction of dead load and resulting construction cost reduction, and has been successfully applied to marine concrete constructions. This paper deals with the high strength, high fluidity lightweight concrete with bulk densities from 1.8 to 2.0 t/cu m and compressive strength from 60 to 90 MPa manufactured with belite-rich low heat cement and silica fume cement, and discusses the influences of materials and mixture proportions upon the properties of fresh and hardened concretes. Compressive strength with a water-cement ratio of 0.23 was 65 to 79 MPa when silica fume blended cement was used, and was 59 to 68 MPa when belite-rich low heat cement was used.","PeriodicalId":255305,"journal":{"name":"SP-179: Fourth CANMET/ACI/JCI Conference: Advances in Concrete Technology","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130506333","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
This paper describes rapid testing methods for determining blocking behaviour, deformability and segregation resistance of self-compacting concrete. Laboratory test results have shown that the proposed methods can reduce the required extent of laboratory testing and enable the tests to be carried out in less time. A simple apparatus for segregation resistance testing is also proposed. This apparatus and modified L-box apparatus are considered useful for rapid testing of segregation resistance, deformability and blocking behaviour of fresh self-compacting concrete.
{"title":"Rapid Testing Methods for Segregation Resistance and Filling Ability of Self-Compacting Concrete","authors":"B. K. Van, D. Montgomery, I. Hinczak, K. Turner","doi":"10.14359/6033","DOIUrl":"https://doi.org/10.14359/6033","url":null,"abstract":"This paper describes rapid testing methods for determining blocking behaviour, deformability and segregation resistance of self-compacting concrete. Laboratory test results have shown that the proposed methods can reduce the required extent of laboratory testing and enable the tests to be carried out in less time. A simple apparatus for segregation resistance testing is also proposed. This apparatus and modified L-box apparatus are considered useful for rapid testing of segregation resistance, deformability and blocking behaviour of fresh self-compacting concrete.","PeriodicalId":255305,"journal":{"name":"SP-179: Fourth CANMET/ACI/JCI Conference: Advances in Concrete Technology","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117182342","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
This paper presents the results of an experimental investigation of shrinkage and creep under uniaxial compressive loading of Reactive Powder Concrete (RPC). RPCs are ultra-high strength concretes characterized by high silica fume content and steel fiber reinforcement. The present study focuses on RPC with a very low water/binder ratio (0.17) and a compressive strength at 28 days of 160 MPa and 200 MPa after a 90 deg C heat treatment. The thermogravimetric analysis shows that in RPC a high proportion of cement remains unhydrated, and the pozzolanic reaction becomes predominant two weeks after mixing. The autogenous shrinkage and creep of RPC were measured on sealed specimens. The stress level on the creep specimens represented 20% of the concrete compressive strength at the time of loading. The basic creep kinetics of RPC is very rapid and does not differ from high strength concrete, whereas its magnitude can be twice as much. The basic creep amplitude and kinetics of RPC are strongly affected by the age of loading. After a heat treatment of RPC at 90 deg C, the shrinkage becomes insignificant, and the basic creep is highly reduced.
{"title":"A Study on Delayed Deformations of an Ultra High Strength Cementitious Material","authors":"A. Loukili, P. Richard, J. Lamirault","doi":"10.14359/6080","DOIUrl":"https://doi.org/10.14359/6080","url":null,"abstract":"This paper presents the results of an experimental investigation of shrinkage and creep under uniaxial compressive loading of Reactive Powder Concrete (RPC). RPCs are ultra-high strength concretes characterized by high silica fume content and steel fiber reinforcement. The present study focuses on RPC with a very low water/binder ratio (0.17) and a compressive strength at 28 days of 160 MPa and 200 MPa after a 90 deg C heat treatment. The thermogravimetric analysis shows that in RPC a high proportion of cement remains unhydrated, and the pozzolanic reaction becomes predominant two weeks after mixing. The autogenous shrinkage and creep of RPC were measured on sealed specimens. The stress level on the creep specimens represented 20% of the concrete compressive strength at the time of loading. The basic creep kinetics of RPC is very rapid and does not differ from high strength concrete, whereas its magnitude can be twice as much. The basic creep amplitude and kinetics of RPC are strongly affected by the age of loading. After a heat treatment of RPC at 90 deg C, the shrinkage becomes insignificant, and the basic creep is highly reduced.","PeriodicalId":255305,"journal":{"name":"SP-179: Fourth CANMET/ACI/JCI Conference: Advances in Concrete Technology","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115376297","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In recent years, high strength concrete (HSC) has become at attractive alternative to traditional normal strength concrete (NSC). With the increased use of HSC, concern has developed regarding the behaviour of such concrete in fire. Studies are in progress at the National Research Council of Canada for developing design guidelines for the use of HSC under fire conditions. The behaviour of HSC columns is illustrated by comparing the fire resistance performance of HSC columns with that of NSC columns. Results from experimental studies that were carried out to determine the thermal properties of HSC, with and without steel fibre-reinforcement, at elevated temperatures are also presented. The effect of temperature on thermal conductivity, thermal expansion, specific heat and mass loss of HSC is discussed. Test data indicate that the type of aggregate has significant influence on the thermal properties of HSC, while the presence of steel fibre-reinforcement has very little influence on the thermal properties of HSC.
{"title":"Thermal Properties of High Strength Concrete at Elevated Temperatures","authors":"Venkatesh R. Kodur, M. Sultan","doi":"10.14359/6056","DOIUrl":"https://doi.org/10.14359/6056","url":null,"abstract":"In recent years, high strength concrete (HSC) has become at attractive alternative to traditional normal strength concrete (NSC). With the increased use of HSC, concern has developed regarding the behaviour of such concrete in fire. Studies are in progress at the National Research Council of Canada for developing design guidelines for the use of HSC under fire conditions. The behaviour of HSC columns is illustrated by comparing the fire resistance performance of HSC columns with that of NSC columns. Results from experimental studies that were carried out to determine the thermal properties of HSC, with and without steel fibre-reinforcement, at elevated temperatures are also presented. The effect of temperature on thermal conductivity, thermal expansion, specific heat and mass loss of HSC is discussed. Test data indicate that the type of aggregate has significant influence on the thermal properties of HSC, while the presence of steel fibre-reinforcement has very little influence on the thermal properties of HSC.","PeriodicalId":255305,"journal":{"name":"SP-179: Fourth CANMET/ACI/JCI Conference: Advances in Concrete Technology","volume":"138 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114567122","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
This paper presents an empirical equation representing the relation between the amount of air laden chlorides reaching a concrete surface and the rate of chloride ions penetrating into concrete. By using this proposed equation as a boundary condition, an analytical diffusion model is presented, where various factors such as water-cement ratio (w/c ratio), carbonation depth, and lapse of time after construction are considered. Comparing the analytical results obtained from the proposed model with the experimental results, the effectiveness of this proposed model is confirmed.
{"title":"Study of the Penetrating Process of Chloride Ions into Concrete","authors":"Y. Yamada, T. Oshiro, Y. Masuda","doi":"10.14359/6048","DOIUrl":"https://doi.org/10.14359/6048","url":null,"abstract":"This paper presents an empirical equation representing the relation between the amount of air laden chlorides reaching a concrete surface and the rate of chloride ions penetrating into concrete. By using this proposed equation as a boundary condition, an analytical diffusion model is presented, where various factors such as water-cement ratio (w/c ratio), carbonation depth, and lapse of time after construction are considered. Comparing the analytical results obtained from the proposed model with the experimental results, the effectiveness of this proposed model is confirmed.","PeriodicalId":255305,"journal":{"name":"SP-179: Fourth CANMET/ACI/JCI Conference: Advances in Concrete Technology","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123427981","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
This paper presents an experimental investigation on shrinkage and creep of high strength concrete, in which 200 x 250 x 300 mm specimens were used, sealed or dried and loaded at different ages, including earlier age after casting. For this purpose high strength concrete was made with high-early strength cement and silica fume. The effects of the age at which drying and loading started on shrinkage and creep properties are discussed. Creep at early age of loading develops very quickly. The earlier the age when drying, the larger the total shrinkage is, and the relation between increment of autogenous shrinkage after drying and increment of drying shrinkage is approximately linear, independent of the age when drying started. Based on the experimental results, the equations of CEB-FIP MODEL CODE 1990 are modified by using regression analysis for predicting autogenous shrinkage and creep of high strength concrete at various ages.
{"title":"Experimental Investigation on Shrinkage and Creep of High Strength Concrete at Early Ages","authors":"Y. Yang, M. Xu, R. Sato, M. Tezuka","doi":"10.14359/6040","DOIUrl":"https://doi.org/10.14359/6040","url":null,"abstract":"This paper presents an experimental investigation on shrinkage and creep of high strength concrete, in which 200 x 250 x 300 mm specimens were used, sealed or dried and loaded at different ages, including earlier age after casting. For this purpose high strength concrete was made with high-early strength cement and silica fume. The effects of the age at which drying and loading started on shrinkage and creep properties are discussed. Creep at early age of loading develops very quickly. The earlier the age when drying, the larger the total shrinkage is, and the relation between increment of autogenous shrinkage after drying and increment of drying shrinkage is approximately linear, independent of the age when drying started. Based on the experimental results, the equations of CEB-FIP MODEL CODE 1990 are modified by using regression analysis for predicting autogenous shrinkage and creep of high strength concrete at various ages.","PeriodicalId":255305,"journal":{"name":"SP-179: Fourth CANMET/ACI/JCI Conference: Advances in Concrete Technology","volume":"337 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124741947","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：