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首页> 外文期刊>Cement & concrete composites >Enhancing the performance of calcium sulfoaluminate blended cements with shrinkage reducing admixture or lightweight sand
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Enhancing the performance of calcium sulfoaluminate blended cements with shrinkage reducing admixture or lightweight sand

机译：通过收缩减少混合物或轻质沙子增强磺盐混合水泥的性能

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This study investigates the effect of using shrinkage reducing admixture (SRA) or lightweight sand (LWS) on enhancing the performance of calcium sulfoaluminate (CSA) cement in combination with ordinary Portland cement (OPC). Of special interest is the efficacy of the SRA or LWS in modifying the expansion/shrinkage and compressive strength characteristics of OPC-CSA systems in the absence of adequate duration of water curing, which is critical for the expansive reaction of CSA cement and its ability to mitigate shrinkage. Hydration kinetics, autogenous and drying deformation, thermogravimetry, and scanning electron microscopy (SEM) are used to evaluate the effect of SRA or LWS on the performance of the OPC-CSA systems. Test results indicate that the OPC-CSA system can exhibit similar drying shrinkage to that of the plain OPC mixture when no moist curing is applied. In the presence of LWS or SRA, the OPC-CSA systems exhibited lower shrinkage or higher extent of expansion compared to the corresponding OPC-CSA mixture alone. This is attributed to delay of the drop in internal relative humidity and promoting hydration of the OPC-CSA system which can enhance the ettringite-generating potential of CSA cement. The use of LWS was found to be highly effective in enhancing compressive strength of OPC-CSA system. SEM results at 91 days confirm the higher density and lower porosity for the paste surrounding LWS particles compared to the corresponding mixture made without LWS. In the case of inadequate moist curing, the presence of LWS or SRA is shown to enhance the overall performance of OPC-CSA system. For a given overall desirability value of 0.65 determined by multi-objective optimization, the incorporation of 1% SRA or 10% LWS was found to enable the reduction the required period of moist curing from 6 days to 5 and 3 days, respectively. (C) 2017 Elsevier Ltd. All rights reserved.
机译：本研究研究了使用收缩减少混合物（SRA）或轻质砂（LWS）对普通波特兰水泥（OPC）组合增强磺碱酸钙（CSA）水泥的性能的影响。特别兴趣是SRA或LW在没有足够的水固化持续时间的情况下改变OPC-CSA系统的膨胀/收缩和抗压强度特征，这对于CSA水泥的膨胀反应至关重要，这对综合反应至关重要减轻收缩。水合动力学，自生和干燥变形，热重试验和扫描电子显微镜（SEM）用于评估SRA或LWS对OPC-CSA系统性能的影响。试验结果表明，当没有施加湿固化时，OPC-CSA系统可以表现出类似的干燥收缩率与普通OPC混合物相似的干燥收缩。在LWS或SRA存在下，与单独的OPC-CSA混合物相比，OPC-CSA系统表现出较低的膨胀程度或更高的膨胀程度。这归因于内部相对湿度下降的延迟，促进OPC-CSA系统的水合，这可以增强CSA水泥的Ettringite产生潜力。发现LWS的使用在提高OPC-CSA系统的压缩强度方面非常有效。与没有LW的相应混合物相比，SEM在91天内确认围绕LWS颗粒的糊状物的较高密度和更低的孔隙率。在潮湿固化不足的情况下，显示LWS或SRA的存在，提高OPC-CSA系统的整体性能。对于通过多目标优化确定的给定总体期望值0.65，发现掺入1％SRA或10％LWS，使降低6天至5和3天的所需期限。 （c）2017 Elsevier Ltd.保留所有权利。

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