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Amazon açaí fiber-Portland cement compatibility: a challenge to produce cement-bonded fiberboards? 亚马逊阿萨伊纤维与硅酸盐水泥的兼容性:生产水泥粘结纤维板的挑战?
IF 2 4区 工程技术 Q3 CONSTRUCTION & BUILDING TECHNOLOGY Pub Date : 2024-05-05 DOI: 10.1680/jadcr.23.00074
Dhimitrius Neves Paraguassú Smith de Oliveira, Tiago Marcolino de Souza, Nilson dos Santos Ferreira, Jefferson Bezerra Bezerra, Guillaume Polidori, Lina Bufalino
The açaí waste from Amazon contains short fibers that show potential for reinforcing cement-bonded fiberboards (CBFBs), although their compatibility with cement matrix is still unknown. This work aimed to characterize raw and pretreated açaí fibers and analyze their compatibility with Portland cement by different techniques, besides developing a CBFB. The fibers were subjected to thermal (180, 200, and 220 °C), cold and hot water, alkaline (NaOH), and bleaching (NaOH-H2O2) pretreatments. The chemical and water pretreatments raised the fiber crystalline indexes (28%-57%). The chemical pretreatments individualized the fiber bundles and removed hemicelluloses. Alkali-pretreated and raw fibers had the highest (96%) and lowest (65%) cement compatibility indexes. Portlandite and ettringite appeared after 24 h for most pastes but were delayed for raw and 220 °C-pretreated fibers. In contrast, only the raw fiber specimens reached the required compression strength of 34 MPa after 28 days; hence, they were chosen to produce a CBFB. The boards showed proper thickness swelling (1.4%), but low bending strength (MOE = 647.8 MPa; MOR = 1.9 MPa). Overall, the fiber modifications improved the compatibility with cement, but not the composite's mechanical strength. Açai-fiber CBFB is a promising building material, but future studies must overcome its poor mechanical performance.
亚马逊河流域的阿萨伊废弃物中含有短纤维,这些纤维具有增强水泥粘结纤维板(CBFB)的潜力,但它们与水泥基质的兼容性仍是未知数。这项工作的目的是分析未加工和预处理的阿萨伊纤维的特性,并通过不同的技术分析它们与波特兰水泥的兼容性,同时开发一种 CBFB。对纤维进行了热处理(180、200 和 220 °C)、冷水和热水处理、碱处理(NaOH)和漂白处理(NaOH-H2O2)。化学预处理和水预处理提高了纤维的结晶指数(28%-57%)。化学预处理使纤维束个体化,并去除半纤维素。碱预处理纤维和未加工纤维的水泥相容性指数最高(96%),最低(65%)。大多数浆料在 24 小时后出现波长石和乙炔石,但未加工纤维和经 220 °C 预处理的纤维则延迟出现。相比之下,只有原纤维试样在 28 天后达到了所需的 34 兆帕压缩强度;因此,它们被选为生产 CBFB 的试样。这些木板显示出适当的厚度膨胀(1.4%),但弯曲强度较低(MOE = 647.8 兆帕;MOR = 1.9 兆帕)。总的来说,纤维改性提高了与水泥的相容性,但没有提高复合材料的机械强度。阿萨伊纤维 CBFB 是一种很有前途的建筑材料,但未来的研究必须克服其机械性能差的问题。
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引用次数: 0
Influences of metakaolin and calcined clay blended cement on chloride resistance and electrical resistivity of concrete 偏高岭土和煅烧粘土混合水泥对混凝土抗氯性和电阻率的影响
IF 2 4区 工程技术 Q3 CONSTRUCTION & BUILDING TECHNOLOGY Pub Date : 2024-05-05 DOI: 10.1680/jadcr.23.00162
Aunchana Kijjanon, Taweechai Sumranwanich, Somnuk Tangtermsirikul
There are many different grades of kaolinite clays around the world. Low-grade kaolinite clay is more abundant than high-grade kaolinite clay in various regions. To aim toward the utilization of low-grade kaolinite clay having an original kaolinite content of about 40% to produce calcined clay, this paper investigated the durability properties of concrete incorporating calcined clay produced from high-grade kaolinite clay or high kaolinite content (commercially available metakaolin or CC1) and calcined clay produced from a low-grade kaolinite clay (CC2). Concrete mixtures were designed to have a water-to-binder ratio of 0.60. A fly ash-to-binder ratio of 0.20 and calcined kaolinite clay-to-binder ratios of 0.10 and 0.20 were studied. The chloride penetration resistance and the electrical resistivity of concrete were assessed, while the mercury intrusion porosimetry (MIP) was utilized in evaluating the pore structure of concrete. The test results revealed that concrete with CC1 and CC2 exhibited superior chloride penetration resistance and chloride binding capacity than OPC and FA20 concretes. Moreover, using a higher calcined clay-to-binder ratio resulted in a more refined pore structure, which significantly enhanced the chloride resistance of concrete. Although CC2 revealed less performance in improving chloride resistance than CC1, it had superior performance compared to fly ash.
全世界有许多不同等级的高岭石粘土。在不同地区,低品位高岭石粘土比高品位高岭石粘土更为丰富。为了利用原始高岭石含量约为 40% 的低品位高岭土生产煅烧粘土,本文研究了使用高品位高岭土或高岭石含量高的煅烧粘土(市售偏高岭土或 CC1)和使用低品位高岭土(CC2)生产的煅烧粘土制成的混凝土的耐久性能。混凝土混合物的水胶比设计为 0.60。研究了粉煤灰与粘结剂的比率为 0.20,煅烧高岭土与粘结剂的比率为 0.10 和 0.20。对混凝土的抗氯化物渗透性和电阻率进行了评估,并利用汞侵入孔隙模拟法(MIP)评估了混凝土的孔隙结构。测试结果表明,与 OPC 和 FA20 混凝土相比,CC1 和 CC2 混凝土的抗氯化物渗透能力和氯化物结合能力更强。此外,使用较高的煅烧粘土与粘结剂之比会使孔隙结构更加细化,从而显著提高混凝土的抗氯化物能力。虽然 CC2 在提高抗氯化物性能方面不如 CC1,但与粉煤灰相比,它的性能更优越。
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引用次数: 0
3D printing concrete technology from a rheology perspective: a review 从流变学角度看 3D 打印混凝土技术:综述
IF 2 4区 工程技术 Q3 CONSTRUCTION & BUILDING TECHNOLOGY Pub Date : 2024-04-21 DOI: 10.1680/jadcr.23.00205
Liuhua Yang, Yang Gao, Hui Chen, Huazhe Jiao, Mengmeng Dong, Thomas A. Bier, Mintae Kim
The flow and deformation of cement-based materials accompanies the full cycle of 3DPC technology and profoundly affects the quality of printed structures. Therefore, rheology is closely related to this technology. However, since printing materials undergo complex changes (from fluid to solid) during the entire technical process, it is extremely difficult to accurately obtain the rheological parameters of the material, which makes it difficult to characterize the material properties and explore the rheological laws within the technical cycle. In this regard, this article starts from the perspective of rheology, systematically reviews the performance requirements of 3DPC technology for printing materials, critically discusses the existing methods for characterization of material printability, including various conventional and unconventional methods, and clarifies the scope of application of each method. In addition, this article introduces several buildability models based on considering material time dependence, pointing out the direction for the performance optimization of printing materials.
水泥基材料的流动和变形伴随着 3DPC 技术的整个周期,并深刻影响着打印结构的质量。因此,流变学与这项技术密切相关。然而,由于打印材料在整个技术过程中会发生复杂的变化(从流体到固体),要准确获得材料的流变参数极其困难,这就给表征材料特性和探索技术周期内的流变规律带来了困难。为此,本文从流变学的角度出发,系统回顾了 3DPC 技术对打印材料的性能要求,批判性地讨论了现有的材料打印性表征方法,包括各种常规和非常规方法,并明确了每种方法的适用范围。此外,本文还在考虑材料时间依赖性的基础上介绍了几种可构建性模型,为打印材料的性能优化指明了方向。
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引用次数: 0
Investigation of anionic group characteristics of PCEs on the behavior of fly ash cementitious systems 研究聚氯乙烯阴离子基团特性对粉煤灰胶凝体系行为的影响
IF 2 4区 工程技术 Q3 CONSTRUCTION & BUILDING TECHNOLOGY Pub Date : 2024-04-07 DOI: 10.1680/jadcr.23.00201
Kemal Karakuzu, Veysel Kobya, Ali Mardani, Burak Felekoğlu, Kambiz Ramyar
This study investigated the compatibility of polycarboxylate-based water reducing admixtures (PCE) having different carboxylate, phosphate and sulfonate anionic groups with paste and mortar mixtures containing fly ash. According to the results, with the increase of the fly ash content of the mixtures, PCE requirement for the target flow decreased, as well as consistency retention performance improved due to the decrease in the amount of hydrated cement. An improvement in rheological parameters was observed with the increase in fly ash content from 15% to 30%. However, increasing the fly ash replacement level beyond 30% caused stability problems in the mixtures. This problem was eliminated with PCE addition. In the paste and mortar mixtures, regardless of the fly ash substitution ratio, the best performance was obtained with PCEs containing 7% and 5% phosphate and sulfonate, respectively. The most suitable fly ash replacement ratio in terms of rheological parameters and 28-day compressive strength was 30% and 15%, respectively. It was observed that PCE anionic group content did not have any significant effect on all fly ash substitution ratios.
本研究调查了具有不同羧酸盐、磷酸盐和磺酸盐阴离子基团的聚羧酸盐基减水剂(PCE)与含粉煤灰的浆料和砂浆混合物的相容性。结果表明,随着混合物中粉煤灰含量的增加,目标流动度所需的 PCE 量减少,同时由于水化水泥量减少,稠度保持性能也得到改善。随着粉煤灰含量从 15% 增加到 30%,流变参数也有所改善。然而,粉煤灰替代量增加到 30% 以上时,混合物的稳定性就会出现问题。添加 PCE 后,这一问题得以解决。在糊状混合物和砂浆混合物中,无论粉煤灰替代率如何,磷酸盐和磺酸盐含量分别为 7% 和 5% 的聚合氯化铝的性能最佳。就流变参数和 28 天抗压强度而言,最合适的粉煤灰替代率分别为 30% 和 15%。据观察,PCE 阴离子基团含量对所有粉煤灰替代率均无显著影响。
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引用次数: 0
Assessment of meta-schist as a novel sustainable resource for Portland cement manufacturing 评估作为硅酸盐水泥生产新型可持续资源的元片石
IF 2 4区 工程技术 Q3 CONSTRUCTION & BUILDING TECHNOLOGY Pub Date : 2024-03-29 DOI: 10.1680/jadcr.23.00132
Abdul Korkmaz, Hasan Hacifazlioğlu
In this study, the use of meta-schist as an alternative to sand-clay in preparing cement raw mixtures was investigated for the first time. Although there are high meta-schist reserves in many countries, especially in Turkey and America, there have not been enough experimental studies for their use in cement production, and their superior technical features still need to be demonstrated. To produce the highest quality Portland cement clinker by examining the mineral and chemical properties of meta-schists, two different raw meal samples were prepared, utilizing conventional cement clay as a baseline sample ((PC) Ref) and the other with meta-schist ((PC) MSC). The effects of both raw mixtures on burnability tests and reactivity were evaluated based on the unreacted lime content in samples after sintered at 1200, 1300, 1350, 1400, and 1450 °C. As a result of firing at 1450 °C, ((PC) MSC) exhibited good sintering properties by showing less than 1% free lime by weight. The porosity amount, distribution, grain structure of silicate phase crystals and equivalent crystal diameters and amounts of meta-schist clinker phases (C3S, C2S, C3A and C4AF) examined by polarizing optical microscope showed that they are suitable for the production of PC. The point counting method, Bogue model calculations, and XRD patterns have confirmed this result. The hydration products of the cement mortars were determined by SEM and EDX analysis at 2, 7, and 28 days. In addition, the compressive strength test results of ((PC) MSC) and ((PC) Ref) mortars after 28 days of curing ranged between 57 and 55,5 MPa, and the produced cement was classified as CEM I 42,5R.
在这项研究中,首次调查了在制备水泥生料混合物时使用元冲灰岩替代砂粘土的情况。虽然许多国家,特别是土耳其和美国的元页岩储量很高,但在水泥生产中使用元页岩的实验研究还不够多,其优越的技术特性仍有待证明。为了通过研究元片麻岩的矿物和化学特性来生产最高质量的波特兰水泥熟料,我们制备了两种不同的生料样品,一种以传统水泥粘土为基准样品((PC)Ref),另一种以元片麻岩为基准样品((PC)MSC)。根据在 1200、1300、1350、1400 和 1450 °C 下烧结后样品中未反应的石灰含量,评估了两种生料混合物对燃烧性测试和反应性的影响。在 1450 °C 煅烧后,((PC)MSC)表现出良好的烧结性能,游离石灰含量小于 1%(按重量计)。通过偏光光学显微镜检测硅酸盐相晶体的孔隙率、分布、晶粒结构以及元硬石膏相(C3S、C2S、C3A 和 C4AF)的等效晶体直径和数量,结果表明它们适合生产 PC。点计数法、博格模型计算和 X 射线衍射图均证实了这一结果。水泥砂浆的水化产物是在 2 天、7 天和 28 天时通过 SEM 和 EDX 分析测定的。此外,((PC) MSC)和((PC) Ref)砂浆在 28 天固化后的抗压强度测试结果介于 57 和 55.5 兆帕之间,生产的水泥被归类为 CEM I 42.5R。
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引用次数: 0
Experimental investigation on chemical and thermomechanical properties of concrete incorporating Washingtonia Robusta fibers 掺入华盛顿罗布斯塔纤维的混凝土化学和热力学性能实验研究
IF 2 4区 工程技术 Q3 CONSTRUCTION & BUILDING TECHNOLOGY Pub Date : 2024-03-25 DOI: 10.1680/jadcr.23.00036
Sakami Siham, Lahcen Boukhattem, Mustapha Boumhaout
This work aims to provide new composite material for thermal insulating building applications. The composite was made with mortar reinforced with natural fibers that were extracted from petiole of WR palm tree. The used fibers were first chemically characterized by EDS, SEM, X-ray and infrared diffractometry spectroscopies as well as tensile test to know their morphological structure. Afterward, the fibers were incorporated into mortar with different mass percentages varying from 0 to 4% to experimentally determine the thermomechanical properties of the manufactured samples. The chemical findings indicated that the WR fibers are rich in cellulose, hemicellulose, and lignin, and possess high crystallinity index; which enhance the mechanical properties and durability of the composite. Furthermore, the obtained density of the composite W2RC4% is of 1305 kg/m3 and less than 2000 kg/m³; this composite can be then classified as lightweight concretes according to the standard NF EN 206+A2/CN (2022). The thermal conductivity and thermal effusivity dropped by about 60% and 42% respectively. Moreover, the WR reduces the compressive strength (76%) and the flexural strength (36%) to minimum values respectively of 5.9 MPa and 3.8 MPa. These values meet the mechanical requirements of lightweight concretes (>3.5 MPa).
这项工作旨在为隔热建筑应用提供新型复合材料。这种复合材料是用从 WR 棕榈树叶柄中提取的天然纤维增强砂浆制成的。首先通过 EDS、SEM、X 射线和红外衍射光谱以及拉伸试验对所用纤维进行化学表征,以了解其形态结构。然后,将纤维以 0% 至 4% 的不同质量百分比加入砂浆中,通过实验确定所制造样品的热机械性能。化学研究结果表明,WR 纤维含有丰富的纤维素、半纤维素和木质素,并具有较高的结晶度指数,这增强了复合材料的机械性能和耐久性。此外,W2RC4% 复合材料的密度为 1305 kg/m3,小于 2000 kg/m³;根据 NF EN 206+A2/CN 标准(2022 年),该复合材料可归类为轻质混凝土。导热系数和热效率分别降低了约 60% 和 42%。此外,WR 还降低了抗压强度(76%)和抗弯强度(36%),最低值分别为 5.9 兆帕和 3.8 兆帕。这些值符合轻质混凝土的机械要求(3.5 兆帕)。
{"title":"Experimental investigation on chemical and thermomechanical properties of concrete incorporating Washingtonia Robusta fibers","authors":"Sakami Siham, Lahcen Boukhattem, Mustapha Boumhaout","doi":"10.1680/jadcr.23.00036","DOIUrl":"https://doi.org/10.1680/jadcr.23.00036","url":null,"abstract":"This work aims to provide new composite material for thermal insulating building applications. The composite was made with mortar reinforced with natural fibers that were extracted from petiole of WR palm tree. The used fibers were first chemically characterized by EDS, SEM, X-ray and infrared diffractometry spectroscopies as well as tensile test to know their morphological structure. Afterward, the fibers were incorporated into mortar with different mass percentages varying from 0 to 4% to experimentally determine the thermomechanical properties of the manufactured samples. The chemical findings indicated that the WR fibers are rich in cellulose, hemicellulose, and lignin, and possess high crystallinity index; which enhance the mechanical properties and durability of the composite. Furthermore, the obtained density of the composite W2RC4% is of 1305 kg/m<sup>3</sup> and less than 2000 kg/m³; this composite can be then classified as lightweight concretes according to the standard NF EN 206+A2/CN (2022). The thermal conductivity and thermal effusivity dropped by about 60% and 42% respectively. Moreover, the WR reduces the compressive strength (76%) and the flexural strength (36%) to minimum values respectively of 5.9 MPa and 3.8 MPa. These values meet the mechanical requirements of lightweight concretes (&gt;3.5 MPa).","PeriodicalId":7299,"journal":{"name":"Advances in Cement Research","volume":"31 1","pages":""},"PeriodicalIF":2.0,"publicationDate":"2024-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140314963","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Influence of thermochemical high-temperature reconstruction on mechanical properties and activity of stainless steel slag 热化学高温重构对不锈钢渣机械性能和活性的影响
IF 2 4区 工程技术 Q3 CONSTRUCTION & BUILDING TECHNOLOGY Pub Date : 2024-02-24 DOI: 10.1680/jadcr.23.00083
Pengjie Xu, Jintao Fan, Rongjin Liu, Ping Chen, Jiazhan Wei, Yi Yang, Xiaochun Tang
The stainless steel slag's low activity, primarily attributed to its high γ-C2S and low C3S content, impedes its effective utilization. This study employs a thermochemical high-temperature reconstruction method utilizing lime and bauxite as tempering agents to regulate the mineral phase. Through an array of tests and analytical techniques, including compressive strength test, activity index, XRD, SEM, and hydration heat analysis, the impact of Ca/Si ratio and sintering temperature on the mechanical properties and activity of reconstituted stainless steel slag mortar is examined. The findings indicate that at a Ca/Si ratio of 4.2 and a sintering temperature of 1290°C, the reconstructed slag demonstrates optimal mechanical properties and activity, yielding compressive strengths of 43.69 MPa and 62.58 MPa at 7 days and 28 days, respectively, with remarkable 28 day activity index of 143.49%. The proposed thermochemical high-temperature reconstruction method ingeniously employs high temperature to increase the content of C3S while rapid cooling prevents the alteration of the C2S crystalline structure. This innovation significantly enhances the mechanical properties and activity of the stainless steel slag, offering promising avenues to increase its utilization rate.
不锈钢渣的活性较低,主要原因是其γ-C2S 含量较高,而 C3S 含量较低,这阻碍了其有效利用。本研究采用热化学高温重构法,利用石灰和铝矾土作为调质剂来调节矿物相。通过一系列测试和分析技术,包括抗压强度测试、活性指数、XRD、SEM 和水化热分析,研究了 Ca/Si 比和烧结温度对重组不锈钢渣砂浆机械性能和活性的影响。研究结果表明,在 Ca/Si 比为 4.2 和烧结温度为 1290°C 的条件下,重构矿渣具有最佳的机械性能和活性,7 天和 28 天的抗压强度分别为 43.69 兆帕和 62.58 兆帕,28 天活性指数高达 143.49%。所提出的热化学高温重构方法巧妙地利用高温来增加 C3S 的含量,同时快速冷却以防止 C2S 晶体结构的改变。这一创新大大提高了不锈钢渣的机械性能和活性,为提高其利用率提供了广阔的前景。
{"title":"Influence of thermochemical high-temperature reconstruction on mechanical properties and activity of stainless steel slag","authors":"Pengjie Xu, Jintao Fan, Rongjin Liu, Ping Chen, Jiazhan Wei, Yi Yang, Xiaochun Tang","doi":"10.1680/jadcr.23.00083","DOIUrl":"https://doi.org/10.1680/jadcr.23.00083","url":null,"abstract":"The stainless steel slag's low activity, primarily attributed to its high <i>γ</i>-C<sub>2</sub>S and low C<sub>3</sub>S content, impedes its effective utilization. This study employs a thermochemical high-temperature reconstruction method utilizing lime and bauxite as tempering agents to regulate the mineral phase. Through an array of tests and analytical techniques, including compressive strength test, activity index, XRD, SEM, and hydration heat analysis, the impact of Ca/Si ratio and sintering temperature on the mechanical properties and activity of reconstituted stainless steel slag mortar is examined. The findings indicate that at a Ca/Si ratio of 4.2 and a sintering temperature of 1290°C, the reconstructed slag demonstrates optimal mechanical properties and activity, yielding compressive strengths of 43.69 MPa and 62.58 MPa at 7 days and 28 days, respectively, with remarkable 28 day activity index of 143.49%. The proposed thermochemical high-temperature reconstruction method ingeniously employs high temperature to increase the content of C<sub>3</sub>S while rapid cooling prevents the alteration of the C<sub>2</sub>S crystalline structure. This innovation significantly enhances the mechanical properties and activity of the stainless steel slag, offering promising avenues to increase its utilization rate.","PeriodicalId":7299,"journal":{"name":"Advances in Cement Research","volume":"34 1","pages":""},"PeriodicalIF":2.0,"publicationDate":"2024-02-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140167982","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Effects of stream curing on the pore structure of recycled aggregate concrete 流水养护对再生骨料混凝土孔隙结构的影响
IF 2 4区 工程技术 Q3 CONSTRUCTION & BUILDING TECHNOLOGY Pub Date : 2024-02-19 DOI: 10.1680/jadcr.22.00092
Yuzhi Chen, Yingjie Ning, Xudong Chen, Weihong Xuan, Yuzhu Guo
Pore in steam-cured concrete affect its strength and durability, and the optimization of steaming system can improve the pore structure to some extent. However, the influence mechanism of evaporation on recycled aggregate concrete (RCA) remains unclear. In this paper, the effects of curing temperature (20°C, 40°C, 60°C and 80°C), steam curing time (6h, 9h and 12h) and pozzolans (slag powder and fly ash) on the compressive strength and pore structure of RAC were studied. The microstructure characteristics such as pore size and pore size distribution were analyzed by the mercury injection porosimetry. The results shown that steam curing can significantly improve the compressive strength and reduce the most probable aperture and average pore sizes of RAC. Moreover, the effect of slag powder on RAC pore structure is better than that of fly ash. And there is a linear correlation between the compressive strength and the average pore size of steam-cured RAC. This can be an important parameter for constructing future steam cured RAC strength prediction models.
蒸养混凝土中的孔隙会影响其强度和耐久性,优化蒸养系统可在一定程度上改善孔隙结构。然而,蒸发对再生骨料混凝土(RCA)的影响机理尚不清楚。本文研究了养护温度(20°C、40°C、60°C 和 80°C)、蒸气养护时间(6 小时、9 小时和 12 小时)和胶凝剂(矿渣粉和粉煤灰)对再生骨料混凝土抗压强度和孔隙结构的影响。孔隙大小和孔隙分布等微观结构特征由汞注射孔隙测定法进行分析。结果表明,蒸汽固化能显著提高 RAC 的抗压强度,降低其最大可能孔径和平均孔径。此外,矿渣粉对 RAC 孔隙结构的影响优于粉煤灰。而且,蒸汽固化 RAC 的抗压强度与平均孔径之间存在线性关系。这可以作为未来构建蒸汽固化 RAC 强度预测模型的一个重要参数。
{"title":"Effects of stream curing on the pore structure of recycled aggregate concrete","authors":"Yuzhi Chen, Yingjie Ning, Xudong Chen, Weihong Xuan, Yuzhu Guo","doi":"10.1680/jadcr.22.00092","DOIUrl":"https://doi.org/10.1680/jadcr.22.00092","url":null,"abstract":"Pore in steam-cured concrete affect its strength and durability, and the optimization of steaming system can improve the pore structure to some extent. However, the influence mechanism of evaporation on recycled aggregate concrete (RCA) remains unclear. In this paper, the effects of curing temperature (20°C, 40°C, 60°C and 80°C), steam curing time (6h, 9h and 12h) and pozzolans (slag powder and fly ash) on the compressive strength and pore structure of RAC were studied. The microstructure characteristics such as pore size and pore size distribution were analyzed by the mercury injection porosimetry. The results shown that steam curing can significantly improve the compressive strength and reduce the most probable aperture and average pore sizes of RAC. Moreover, the effect of slag powder on RAC pore structure is better than that of fly ash. And there is a linear correlation between the compressive strength and the average pore size of steam-cured RAC. This can be an important parameter for constructing future steam cured RAC strength prediction models.","PeriodicalId":7299,"journal":{"name":"Advances in Cement Research","volume":"96 1","pages":""},"PeriodicalIF":2.0,"publicationDate":"2024-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140168505","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Study on the effect of gypsum content in cement on the adaptability between cement and alkali-free accelerator at different temperatures 水泥中石膏含量对不同温度下水泥与无碱促进剂适应性的影响研究
IF 2 4区 工程技术 Q3 CONSTRUCTION & BUILDING TECHNOLOGY Pub Date : 2023-12-26 DOI: 10.1680/jadcr.23.00165
Qin Wang, Zhixiang Guo, Fanchao Zeng, Hongwei Wang, Huaixia Qin
The setting time and early strength of shotcrete is greatly affected by the gypsum content of cement. In this paper, setting time and compressive strength, and microscopic methods such as XRD quantitative analysis, thermogravimetric analysis and scanning electron microscope observation were used to determine the effects of changes in gypsum content on the hydration and mechanical properties of cement mixed with accelerator at different temperatures. The results showed that an increase in the gypsum content of cement promoted the formation of ettringite (AFt) and decreased the setting times of cement pastes at 0°C, 20°C and 40°C. Mortar compressive strength test revealed that after curing at 0°C, 20 °C and 40°C, the highest compressive strength was exhibited with final molar C3A/SO3 ratio of 0.84, 0.84 and 1.18, respectively. The mechanical properties of hardened cement pastes were adversely affected by C3A/SO3 ratios that were too high or too low. When the C3A/SO3 ratio was too high, which facilitated conversion of AFt to monosulphate(AFm) and slowed C3S hydration. Conversely, when the C3A/SO3 ratio was too low, which enabled large numbers of AFt to occupy the space where C-S-H gels was formed, resulting in decalcification of C-S-H gels.
喷射混凝土的凝结时间和早期强度受水泥中石膏含量的影响很大。本文采用凝结时间和抗压强度,以及 XRD 定量分析、热重分析和扫描电镜观察等微观方法,测定了石膏含量的变化对不同温度下掺加促进剂的水泥的水化和力学性能的影响。结果表明,水泥中石膏含量的增加会促进乙丁睛石(AFt)的形成,并缩短水泥浆在 0°C、20°C 和 40°C 时的凝结时间。砂浆抗压强度测试表明,在 0°C、20°C 和 40°C 下固化后,最终摩尔 C3A/SO3 比率分别为 0.84、0.84 和 1.18 时,抗压强度最高。C3A/SO3 比率过高或过低都会对硬化水泥浆的机械性能产生不利影响。当 C3A/SO3 比率过高时,会促进 AFt 转化为单硫酸盐(AFm),减缓 C3S 的水化。相反,当 C3A/SO3 比率过低时,大量 AFt 会占据 C-S-H 凝胶形成的空间,导致 C-S-H 凝胶脱钙。
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引用次数: 0
Accelerated carbonation of regenerated binding material prepared with waste cement paste powder 用废弃水泥浆粉制备的再生结合材料的加速碳化
IF 2 4区 工程技术 Q3 CONSTRUCTION & BUILDING TECHNOLOGY Pub Date : 2023-12-25 DOI: 10.1680/jadcr.23.00098
Linnu Lu, Peng Wang, Yongjia He, Ma Jie, Fazhou Wang, Shuguang Hu
An approach for efficient re-utilization of waste cement paste powders is proposed, that is, the powders are heated to a certain temperature to prepare Regenerated Binding Materials (RBMs), and then rapid carbonated by high concentration CO2 to prepare high-strength products. The structural evolution during the heating process of waste cement paste powder and the carbonation process of RBMs were investigated by XRD, SEM, and 29Si NMR etc., and the compressive strength of the carbonated RBM samples was measured. The results show that the differences in carbonation reactivity, carbonation products of RBMs, and properties of carbonated RBMs are mainly attributed to the differences in structural order degree of newly formed β-C2S, the content of β-C2S, f-CaO and incomplete decomposed C-S-H in RBMs. The strength of the carbonated sample of RBM prepared at 1050 °C was the highest, followed by that prepared at 950 °C, which was significantly higher than those prepared at 650 °C, 750 °C and 850 °C. The content of highly ordered β-C2S in RBMs with high carbonation reactivity, and the dense stacking of the carbonation products are beneficial for the mechanical properties.
提出了一种高效再利用废弃水泥浆粉末的方法,即将粉末加热到一定温度制备再生结合材料(RBM),然后用高浓度二氧化碳快速碳化制备高强度产品。通过 XRD、SEM 和 29Si NMR 等方法研究了废弃水泥浆粉末加热过程和 RBM 碳化过程中的结构演变,并测量了碳化 RBM 样品的抗压强度。结果表明,碳化反应性、RBM 的碳化产物和碳化 RBM 性能的差异主要归因于 RBM 中新形成的 β-C2S 结构阶次、β-C2S、f-CaO 和未完全分解的 C-S-H 的含量不同。在 1050 ℃ 下制备的碳化 RBM 样品强度最高,其次是 950 ℃ 下制备的碳化 RBM 样品,明显高于 650 ℃、750 ℃ 和 850 ℃ 下制备的碳化 RBM 样品。碳化反应活性高的 RBM 中高度有序的 β-C2S 含量以及碳化产物的致密堆积有利于其机械性能的提高。
{"title":"Accelerated carbonation of regenerated binding material prepared with waste cement paste powder","authors":"Linnu Lu, Peng Wang, Yongjia He, Ma Jie, Fazhou Wang, Shuguang Hu","doi":"10.1680/jadcr.23.00098","DOIUrl":"https://doi.org/10.1680/jadcr.23.00098","url":null,"abstract":"An approach for efficient re-utilization of waste cement paste powders is proposed, that is, the powders are heated to a certain temperature to prepare Regenerated Binding Materials (RBMs), and then rapid carbonated by high concentration CO<sub>2</sub> to prepare high-strength products. The structural evolution during the heating process of waste cement paste powder and the carbonation process of RBMs were investigated by XRD, SEM, and <sup>29</sup>Si NMR etc., and the compressive strength of the carbonated RBM samples was measured. The results show that the differences in carbonation reactivity, carbonation products of RBMs, and properties of carbonated RBMs are mainly attributed to the differences in structural order degree of newly formed <i>β</i>-C<sub>2</sub>S, the content of <i>β</i>-C<sub>2</sub>S, <i>f</i>-CaO and incomplete decomposed C-S-H in RBMs. The strength of the carbonated sample of RBM prepared at 1050 °C was the highest, followed by that prepared at 950 °C, which was significantly higher than those prepared at 650 °C, 750 °C and 850 °C. The content of highly ordered <i>β</i>-C<sub>2</sub>S in RBMs with high carbonation reactivity, and the dense stacking of the carbonation products are beneficial for the mechanical properties.","PeriodicalId":7299,"journal":{"name":"Advances in Cement Research","volume":"3 1","pages":""},"PeriodicalIF":2.0,"publicationDate":"2023-12-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139055687","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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Advances in Cement Research
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