阿蒂奥李约瑟夫,贝洛托吉尔伯托

在这项工作中，作者评估了控制石灰石煅烧粘土水泥(LC3)新鲜状态特性的因素，并将其与波特兰水泥和二元水泥进行了比较，通过将流变学测量与凝结时间测定和塑性收缩评估相结合，扩展了先前的研究范围一种新颖的方法。当向系统施加应力时，屈服应力和弹性模量被视为结构建立/破坏过程的指标。另一方面，塑性收缩发生在从混合到新鲜糊状物凝固的过程中，并且在控制由于沉降和蒸发引起的微观结构变化方面起着重要作用。流变学特性随时间的评估适合于概述不同添加材料的影响和行为。所有粘合剂（熟料、LC3、熟料-石灰石和熟料-煅烧粘土）的弹性模量从混合到固化60分钟增加如下：5.27×103至9.50×105Pa，5.94×103至9.87×105Pa,6.89×103至5.62×105Pa和7.85×103至1.27×106Pa。此外，在固化的前三个小时内，与熟料水泥相比，LC3的塑性收缩率降低了2倍以上。由于絮凝作用和增加吸水性，使用带有熟料的煅烧粘土增加了系统的弹性模量，而当存在大量石灰石时，由于反絮凝作用和系统中自由水的增加而产生了稀释效果在二元水泥中。石灰石和煅烧粘土与熟料的结合可以引发额外的化学反应，从而控制塑性收缩等早期特性。本文所获得的结果有助于通过基于知识的方法优化OPC、煅烧粘土和石灰石三元混合物的新鲜状态特性。

石灰石煅烧粘土水泥；LC3；屈服应力；塑性粘度；流变学；塑性收缩

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