Effect of Expansive Additives on the Early Age Elastic Modulus Development of Cement Paste by Ambient Response Method (ARM)
Effect of Expansive Additives on the Early Age Elastic Modulus Development of Cement Paste by Ambient Response Method (ARM)
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DOI：
10.1007/978-3-030-72921-9_26
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发表时间：
2021
期刊：
影响因子：
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通讯作者：
Mayank Gupta;Igarashi Go;J. Granja;M. Azenha;T. Ishida
中科院分区：
文献类型：
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作者：
Mayank Gupta;Igarashi Go;J. Granja;M. Azenha;T. Ishida
膨胀剂作为减缩补偿剂被广泛应用于混凝土结构中，以减少混凝土的早期开裂和化学预应力。这种膨胀添加剂影响水泥水化产物的组成和水泥和混凝土的机械性能（刚度和强度），这最终影响早期变形。在目前的研究中，EMM-ARM（环境响应法测量弹性模量），是因为它能够连续监测水泥的实时刚度发展与膨胀添加剂浆。通过在刚度测量期间允许自由膨胀，在不受约束的条件下捕获具有膨胀添加剂的水泥浆体的刚度发展。本文研究了一种水泥取代率为10%（重量）的膨胀剂。从EMM-ARM的结果进行了比较，从圆柱形试样的压缩试验的弹性模量测量，并在早期的微观结构上的膨胀作用的机制进行了讨论。
Expansive additives are being widely used as shrinkage reducing/compensating admixture to reduce the early-age cracking and chemical prestressing. Such expansive additives influence the composition of cement hydration products and mechanical properties (stiffness and strength) of the cement and concrete, which ultimately affects the early age deformation. In the current study, the EMM-ARM (Elastic Modulus Measurement by Ambient Response Method), is used because of its ability to continuously monitor cement's real-time stiffness development paste with expansive additives. Stiffness development of the cement paste with expansive additives is captured in the unrestrained condition by allowing the free expansion during the stiffness measurement. An expansive additive, based on free lime, with a 10% (by weight) cement replacement ratio is studied in the current work. Results from the EMM-ARM are compared to the elastic modulus measurement from the compression testing of cylindrical specimens, and the mechanisms of expansive action on the microstructure in early-age are discussed.