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Effect of temperature on the long-term properties of mortars containing waste glass powder and ground granulated blast furnace slag 温度对含废玻璃粉和磨粒矿渣砂浆长期性能的影响
IF 0.7 4区 工程技术 Q4 CONSTRUCTION & BUILDING TECHNOLOGY Pub Date : 2021-01-01 DOI: 10.32047/cwb.2021.26.4.1
Jakub Szydłowski, Wojciech Szudek, Ł. Gołek
The paper presents new and unique results of two-year examinations of mortars containing ground glass, as a substitute for 15 or 30% by mass of ordinary Portland cement in comparison with the properties of mortars with the analogous addition of ground granulated blast furnace slag, in different temperatures. Moreover, after a two-year curing period, the mortars were autoclaved. Samples were subjected to compressive strength measurements, XRD analysis and the determination of calcium hydroxide content, by means of thermogravimetric analysis. The results confirm that as an additive, glass powder, thanks to its pozzolanic properties, can compete with common SCMs like granulated blast furnace slag. Additionally, a reduction in strength was not observed after the autoclaving process, for the mortars with 15% glass addition. The data collected in the paper confirms that the pozzolanic properties of ground glass allows its use as an additive. It also shows the ability of these mortars to maintain a constant level of strength in the long term and even after the autoclaving of two-year-old samples
本文介绍了用磨砂玻璃代替15%或30%质量的普通硅酸盐水泥的砂浆,在不同温度下,与类似添加磨砂的高炉矿渣砂浆的性能进行了为期两年的试验,得出了新的、独特的结果。此外,经过两年的养护期后,砂浆进行高压灭菌。对样品进行了抗压强度测定、XRD分析、氢氧化钙含量测定和热重分析。结果证实,玻璃粉作为添加剂,由于其火山灰性质,可以与粒状高炉渣等普通SCMs竞争。此外,对于添加15%玻璃的砂浆,在高压灭菌过程后没有观察到强度的降低。本文收集的数据证实,磨砂玻璃的火山灰性质允许其作为添加剂使用。它还表明,这些砂浆的能力,以保持一个恒定的强度水平在长期,甚至在高压灭菌两年的样品
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引用次数: 5
Microstructure and properties of geopolymers formed in the alkali activation process of fly ash 粉煤灰碱活化过程中形成的地聚合物的微观结构和性能
IF 0.7 4区 工程技术 Q4 CONSTRUCTION & BUILDING TECHNOLOGY Pub Date : 2021-01-01 DOI: 10.32047/cwb.2021.26.4.2
K. Rajczyk, Grzegorz Janus
The paper presents the results of the study on the possibility of obtaining high-strength durable geopolymer concrete with fly ash as the basic component. As a result of the research conducted, it was found that the highest potential to obtain geopolymer concrete with high strength was shown for fine-grained, specially selected siliceous ashes from coal combustion. However, the geopolymer concrete obtained by alkaline activation of these ashes with the 8M NaOH solution was not resistant to freeze-thaw cycles. Replacement of 15% fly ash with calcined waste clay and the use of the mixture of NaOH solution and water glass as an activator substantially increased the durability of this concrete. This modification of the concrete composition changed the microstructure of the matrix in the hardened concrete, since the cancrinite was found in the study.
本文介绍了以粉煤灰为基本组分获得高强耐用地聚合物混凝土可能性的研究结果。通过研究发现,获得高强度地聚合物混凝土的潜力最大的是细粒度的、特别选择的煤燃烧产生的硅灰。然而,用8M NaOH溶液对这些灰进行碱性活化得到的地聚合物混凝土不耐冻融循环。用煅烧的废粘土代替15%的粉煤灰,并使用氢氧化钠溶液和水玻璃的混合物作为活化剂,大大提高了混凝土的耐久性。这种混凝土成分的改性改变了硬化混凝土中基体的微观结构,因为在研究中发现了癌灰岩。
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引用次数: 0
Particles spasing of supplementary cementitious materials in binary blended cements 二元混合水泥中补充胶凝材料的颗粒间距
IF 0.7 4区 工程技术 Q4 CONSTRUCTION & BUILDING TECHNOLOGY Pub Date : 2021-01-01 DOI: 10.32047/cwb.2021.26.5.1
Guillermina Marchetti, Antonella Di Salvo Barsi, V. Rahhal, Egdardo Irassar
The effect of limestone filler [LF], dolomite filler [DF], metakaolin [MK], and metaillite [MI] additives on the packing density of the binary blended cements were studied using of the water film thickness [WFT] and the optimal water demand [OWD]. The influence of these supplementary cementitious materials [SCM] on the flowability of cement pastes and mortars was analyzed and the compressive strength of mortars was discussed. The results indicate that the incorporation of these SCM on the packing density is highly related to the particle size distribution and the optimal addition of SCM to the blended cements, assures maximum packing density. The effects on flowability not only depend on packing density but of the surface area of particles and the addition of SCM enhance the compressive strength of the mortars.
以水膜厚度[WFT]和最佳需水量[OWD]为指标,研究了石灰石填料[LF]、白云石填料[DF]、偏高岭土[MK]、偏钛石[MI]添加剂对二元混合水泥充填密度的影响。分析了这些补充胶凝材料对水泥浆体和砂浆流动性的影响,并对砂浆的抗压强度进行了讨论。结果表明,填料密度与掺加SCM的粒径分布密切相关,掺加SCM能保证最大的填料密度。砂浆的抗压强度不仅与填料密度有关,还与颗粒表面积有关。
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引用次数: 0
Experimental and numerical study of fiber reinforced concrete beams in four-point bending 纤维混凝土梁四点弯曲试验与数值研究
IF 0.7 4区 工程技术 Q4 CONSTRUCTION & BUILDING TECHNOLOGY Pub Date : 2021-01-01 DOI: 10.32047/cwb.2021.26.5.6
R. Tuğrul Erdem
In this study, the behavior of concrete beams with and without fiber was investigated. In the experimental part, a total of 16 beam specimens were manufactured having different section sizes. 12 specimens were reinforced with synthetic fibers, that provide toughness, impact, and fatigue strength to concrete. The fiber ratios of the samples varied between 0% and 0.20% by mass. The samples were subjected to a four-point bending test to obtain the maximum load and displacement values, until they reached the failure modes. Subsequently, the beam samples were modelled in the Abacus finite element analysis software. Due to the comparison of experimental and numerical values and stress distributions of the specimens, it is seen that numerical analysis could be an option when investigating the behavior of beams with different dimensions in four-point bending.
本文研究了有纤维和无纤维混凝土梁的受力性能。在实验部分,共制作了16个不同截面尺寸的梁试件。12个试件用合成纤维增强,以提高混凝土的韧性、冲击强度和疲劳强度。样品的纤维质量比在0% ~ 0.20%之间。试样进行了四点弯曲试验,以获得最大载荷和位移值,直到达到破坏模式。随后,在Abacus有限元分析软件中对梁样进行建模。通过对试验值和数值值以及试件应力分布的比较,可以看出,在研究不同尺寸梁在四点弯曲中的行为时,数值分析是一种选择。
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引用次数: 0
Unground granulated slag as a substitute for natural aggregate during concrete production 在混凝土生产中,未磨碎的矿渣作为天然骨料的替代品
IF 0.7 4区 工程技术 Q4 CONSTRUCTION & BUILDING TECHNOLOGY Pub Date : 2021-01-01 DOI: 10.32047/cwb.2021.26.3.2
S. Krispel, Helga Zeitlhofer, M. Peyerl
In order to evaluate the usefulness of unground granulated slag for the concrete production, as the partial replacement of fine aggregate – namely sand, the detailed studies of the influence of this addition on the properties of the fresh and hardened concrete were conducted. These studies included the compression strength and the modulus of elasticity determination, as well as the evaluation of durability by the determination of frost resistance. The evaluation of the properties of concretes hardened under winter conditions, at +10oC and summer conditions at +20oC. These studies also covered the resistance to chloride attack and carbonization. The long-lasting examination covered also the ASR. At the end, under real construction conditions in the Austrian prefabrication plant, the unground granulated slag was examined. Under these conditions especially the long-lasting measurements of the strength development of the precast elements were verifi ed. In order to evaluate the usefulness of the unground granulated slag, as partial replacement of fine aggregate, the concretes with the additions of slag of 10% and 15% were produced and examined. For this evaluation, the slags of two Austrian plants from Upper Austria and Styria were used. The old and fresh slags from these two plants were used because the old slags can also be adopted for concrete production. Presented in the paper results are confi rming that the natural aggregate of the fraction < 4 mm can be successfully replaced by unground granulated slag, without any negative influence on the properties of concrete.
为了评价未磨粒矿渣作为部分替代细骨料(即砂)用于混凝土生产的有效性,详细研究了未磨粒矿渣对新拌混凝土和硬化混凝土性能的影响。这些研究包括抗压强度和弹性模量的测定,以及通过测定抗冻性来评估耐久性。在冬季、+10℃和夏季+20℃条件下硬化混凝土的性能评价。这些研究还包括抗氯侵蚀和抗碳化。长期的检查也包括ASR。最后,在奥地利预制厂的实际施工条件下,对未磨粒渣进行了检测。在这些条件下,特别是对预制构件强度发展的长期测量进行了验证。为了评估未磨碎的粒状矿渣作为部分替代细骨料的有用性,生产并检查了矿渣添加量为10%和15%的混凝土。为了进行评估,使用了来自上奥地利州和施蒂里亚州的两个奥地利工厂的炉渣。由于旧渣也可用于混凝土生产,因此采用了这两个厂的新旧渣。本文的研究结果证实,未磨粒渣可以成功地替代小于4mm的天然骨料,而不会对混凝土的性能产生任何负面影响。
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引用次数: 0
Utilization of ground waste glass cullet in the industrial production of precast concrete elements 地面废玻璃屑在混凝土预制构件工业生产中的利用
IF 0.7 4区 工程技术 Q4 CONSTRUCTION & BUILDING TECHNOLOGY Pub Date : 2021-01-01 DOI: 10.32047/cwb.2021.26.2.6
Ł. Gołek, Wojciech Szudek, G. Łój
In the study, a field trial was carried out to evaluate the applicability of ground waste glass cullet as a binder component, in the industrial production of precast concrete elements. The influence of glass cullet addition on the properties of fresh and hardened concretes was compared to siliceous fly ash. Moreover, the effects of a partial substitution of the natural aggregate with recycled concrete and expanded clay aggregate were determined. The compressive strength of concretes, in which 25% of cement was substituted with ground waste glass cullet, was even 20% higher compared to elements with an analogous addition of siliceous fly ash. Over 56 days, no drops in strength related to the harmful effects of the alkali-silica reaction were observed. Replacing half of the natural aggregate with graded recycled concrete aggregate, allowed to lower the thermal conductivity of the walls by approx. 10%, with no negative impact on the compressive strength of precast elements. However, a decrease in the consistency of fresh mix was observed after 30 minutes. Replacing the 2÷8 mm gravel with the same fraction of expanded clay resulted in an approx. 18% decrease in thermal conductivity, while maintaining satisfactory mechanical properties. It was concluded that ground waste glass cullet can be successfully used as a fly ash replacement in the production of precast concrete elements.
在研究中,进行了现场试验,以评估地面废玻璃碎料作为粘结剂成分在预制混凝土构件工业生产中的适用性。研究了玻璃屑掺量对新拌混凝土和硬化混凝土性能的影响,并与硅质粉煤灰进行了比较。此外,还确定了再生混凝土和膨胀粘土骨料部分替代天然骨料的效果。混凝土的抗压强度,其中25%的水泥是用磨碎的废玻璃屑代替的,甚至比添加类似硅质粉煤灰的元素高出20%。在56天内,没有观察到与碱-硅反应有害影响相关的强度下降。用分级再生混凝土骨料代替一半的天然骨料,使墙体的导热性降低了大约。10%,对预制构件抗压强度无负面影响。然而,30分钟后观察到新鲜混合物的稠度下降。将2÷8 mm的砾石替换为相同比例的膨胀粘土,结果约为。导热系数降低18%,同时保持令人满意的机械性能。试验结果表明,地面废玻璃屑可成功地替代粉煤灰用于混凝土预制构件的生产。
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引用次数: 3
Elevated temperature study on geopolymer concrete with ferrochrome slag aggregates 铬铁渣骨料地聚合物混凝土的高温研究
IF 0.7 4区 工程技术 Q4 CONSTRUCTION & BUILDING TECHNOLOGY Pub Date : 2021-01-01 DOI: 10.32047/cwb.2021.26.4.6
P. Indu, S. Greeshma
This paper deals with the strength and mass loss of geopolymer concrete in comparison with conventional cement concrete after elevated temperature exposure. In this study, the coarse aggregates of the conventional geopolymer concrete are replaced partially (40%) with ferrochrome slag aggregates, to obtain the replacement mix of geopolymer concrete. The microstructure of geopolymer concrete was examined by XRD, X-ray tomography, and SEM and also discussed in this paper. The results concluded that after exposure at elevated temperature, the conventional cement concrete has a strength loss of about 18% higher than the geopolymer concrete. It was also noted that though replacement geopolymer mix exhibited the strength loss of 24.4% and mass loss of 1.35% higher than the conventional geopolymer mix, it had greater strength than conventional geopolymer mix, for most of the temperature ranges. Thus the replacement mix of geopolymer concrete behaves better than conventional geopolymer concrete, both at ambient and elevated temperature conditions.
本文研究了地聚合物混凝土与常规水泥混凝土高温暴露后的强度和质量损失。本研究将常规地聚合物混凝土的粗骨料部分(40%)替换为铬铁渣骨料,得到地聚合物混凝土的替代配合比。采用x射线衍射(XRD)、x射线层析成像(X-ray tomography)和扫描电子显微镜(SEM)对地聚合物混凝土的微观结构进行了研究,并对其进行了讨论。结果表明,高温暴露后,常规水泥混凝土的强度损失比地聚合物混凝土高18%左右。还注意到,虽然替代地聚合物混合物的强度损失比常规地聚合物混合物高24.4%,质量损失高1.35%,但在大多数温度范围内,它的强度都高于常规地聚合物混合物。因此,无论是在环境条件下还是在高温条件下,地聚合物混凝土的替代配合比传统地聚合物混凝土性能更好。
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引用次数: 2
Properties of alkali-activated roller compacted concretes produced from waste aggregates 废骨料生产碱活化碾压混凝土的性能研究
IF 0.7 4区 工程技术 Q4 CONSTRUCTION & BUILDING TECHNOLOGY Pub Date : 2021-01-01 DOI: 10.32047/cwb.2021.26.4.7
Saadet Gökçe Gök, I. Kilic, O. Sengul
The energy consumption and the release of carbon dioxide during cement production require the search for alternative building materials. There is an increasing need for more environmentally friendly, more economical, durable and high-strength materials. Studies on recycling of waste materials in construction contribute to meeting this need. In this study, a new material that allows reuse of wastes was produced using known materials and techniques. Alkali-activated roller compacted concrete [AARCC] was produced with recycled coarse aggregates and the mechanical properties of this material were investigated. In this experimental study, the objective was to produce an alternative construction material composed of waste or by-products. Ground granulated blast furnace slag [GGBFS] was activated with a sodium silicate [Na2SiO3] and 10 M sodium hydroxide [NaOH] solution. The Na2SiO3 / NaOH ratio was 2.5 in the activator solution. The coarse aggregates were obtained from roller compacted concrete (RCC) wastes and an environmentally friendly material was produced without using any cement. As a roller compacted concrete is produced with a very dry consistency compared to conventional concrete, the amount of activator used is low, which provides environmental and economic benefits. The compressive strengths of the cube RCC specimens were determined at the ages of 7 and 28 days. Using the mix proportions designed in this study, it was found that the compressive strengths of alkali-activated RCCs were higher than roller compacted Portland cement concrete having high dosage of cement. Unit mass, total water absorption, ultrasonic pulse velocity [UPV], and modulus of elasticity of alkali-activated RCCs were also determined.
水泥生产过程中的能源消耗和二氧化碳释放要求寻找替代建筑材料。人们越来越需要更环保、更经济、更耐用和高强度的材料。对建筑废料回收的研究有助于满足这一需求。在这项研究中,利用已知的材料和技术生产了一种允许废物再利用的新材料。以再生粗集料为原料制备碱活化碾压混凝土,并对其力学性能进行了研究。在这项实验研究中,目标是生产一种由废物或副产品组成的替代建筑材料。用水玻璃[Na2SiO3]和10 M氢氧化钠[NaOH]溶液对磨碎的矿渣[GGBFS]进行活化。在激活剂溶液中,Na2SiO3 / NaOH比为2.5。从碾压混凝土(RCC)废料中获得粗集料,在不使用任何水泥的情况下生产出一种环保材料。由于与传统混凝土相比,碾压混凝土具有非常干燥的稠度,因此活化剂的使用量很低,从而提供了环境和经济效益。测定了立方体碾压混凝土试件在7天和28天时的抗压强度。采用本研究设计的配合比,发现碱活化rcc的抗压强度高于高水泥掺量的碾压波特兰水泥混凝土。测定了碱活化rcc的单位质量、总吸水率、超声脉冲速度(UPV)和弹性模量。
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引用次数: 1
Multi-recycled aggregate concrete towards a sustainable solution – a review 多再生骨料混凝土走向可持续解决方案-综述
IF 0.7 4区 工程技术 Q4 CONSTRUCTION & BUILDING TECHNOLOGY Pub Date : 2021-01-01 DOI: 10.32047/cwb.2021.26.1.4
Madhavi Latha Kasulanati, Rathish Kumar Pancharathi
Reduce, reuse and recycle are the important facets of susta-inable construction and environmental recovery. Increase in the construction activity generates huge amount of construction and demolition waste worldwide, and has a potential to be used as concrete coarse aggregate. In the future, where, most of the cities are likely to become concrete jungles, recycling and multi-recycling of concrete becomes all the more important. Also, the precast industry generates large amount of wastes due to discrepancies in quality of materials. Instead of depositing them as landfi lls or rejecting recycled materials, the possibility of reusing them is investigated and the fi nite number of times the recycling can be done, is examined. The present paper ponders on literature works, done by various researchers to check the variation in properties of recycled concrete aggregate, after fi nite number of generations of recycling. The studies on fresh and hardened state properties of recycled aggregate concrete showed a decrease in quality, with respect to mechanical performance of newly made concrete. The recycled concrete aggregate from precast rejects performed equal to natural concrete and even showed slightly higher compressive strength than natural aggregate concrete and can be replaced up to 20% of natural aggregate, to produce the concrete of accepted quality. The third generation recycled concrete aggregate showed almost twice the amount of mortar as that of fi rst generation re-cycled concrete aggregate. It can be seen that the concrete can be recycled only a fi nite number of times. A relationship between strength and durability properties of recycled aggregate concrete of different generations was derived based on multi-linear regres-sion analysis.
减少、再利用和再循环是可持续建筑和环境恢复的重要方面。建筑活动的增加在世界范围内产生了大量的建筑和拆除垃圾,并有可能用作混凝土粗骨料。在未来,大多数城市都有可能成为混凝土丛林,混凝土的回收和多次回收就变得更加重要。此外,由于材料质量的差异,预制工业产生了大量的废物。我们不是把它们作为堆填区填埋,也不是拒绝回收材料,而是对它们进行再利用的可能性进行调查,并对可循环利用的有限次数进行检查。本论文对各种研究人员所做的文献作品进行了思考,以检查再生混凝土骨料经过有限代回收后性能的变化。对再生骨料混凝土的新鲜和硬化状态性能的研究表明,相对于新制混凝土的力学性能,再生骨料混凝土的质量有所下降。预制废料再生混凝土骨料的性能与天然混凝土相当,甚至比天然骨料混凝土的抗压强度略高,可替代高达20%的天然骨料,以生产质量合格的混凝土。第三代再生混凝土骨料的砂浆用量几乎是第一代再生混凝土骨料的两倍。可以看出,混凝土只能循环使用有限次。基于多元线性回归分析,推导了不同龄期再生骨料混凝土强度与耐久性之间的关系。
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引用次数: 1
Addition of graphene oxide to increase the performance of concrete 添加氧化石墨烯,提高混凝土性能
IF 0.7 4区 工程技术 Q4 CONSTRUCTION & BUILDING TECHNOLOGY Pub Date : 2021-01-01 DOI: 10.32047/cwb.2021.26.4.3
Małgorzata Wydra, Hubert Szulc
The aim of the research was to explain how the addition of graphene oxide [GO] to concrete influences performance parameters such as compressive, tensile, and flexural strength, air permeability, sorptivity, absorbability, frost resistance, and thermal conductivity. It was found that the addition of GO in most cases decreased the compressive strength. Nevertheless, an improvement of selected parameters has been observed, eg, an increase in flexural strength by 7% and a split tensile strength by 6% for concrete with GO in the content of 0.005%. Concrete mixes with higher fluidity and improvement of homogenization procedures are suggested for future research areas.
该研究的目的是解释在混凝土中加入氧化石墨烯(GO)如何影响混凝土的抗压、拉伸和抗弯强度、透气性、吸附性、吸收率、抗冻性和导热性等性能参数。结果表明,在大多数情况下,氧化石墨烯的加入降低了材料的抗压强度。然而,已观察到所选参数的改善,例如,在0.005%的氧化石墨烯含量下,混凝土的抗折强度增加了7%,劈裂抗拉强度增加了6%。建议今后的研究方向是提高混凝土的流动性和改进均质化程序。
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引用次数: 0
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Cement Wapno Beton
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