In this study, hourly three-minute creep testing is used to elucidate the evolution of the viscoelastic behavior of cement pastes produced with ordinary Portland cement (OPC), limestone Portland cement (LPC), and limestone calcined clay cement (LC3), from 1 to 7 days after production. An innovative test evaluation protocol, accounting for shrinkage, is used to identify values of the elastic modulus, the creep modulus, and the creep exponent, without making assumptions. The S-shaped shrinkage evolution of the LC3 paste is explained by Portlandite dissolution and the associated redistribution of chemical shrinkage-induced compressive stresses to the remaining solid skeleton. The evolution of the elastic stiffness of the LC3 paste is explained by space filling by C-A-S-H phases. The small creep compliance of the LC3 paste is explained by C-A-S-H which creeps less than C-S-H, and by AFm phases which precipitate in nanoscopic slit pores between C-S-H structures, gluing viscous interfaces.

中文翻译：

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LC3 浆料在早期每小时 3 分钟的蠕变试验：高级试验评估和火山灰反应对收缩率、弹性刚度和蠕变的影响


在本研究中，每小时进行 3 分钟的蠕变测试，以阐明用普通波特兰水泥 （OPC）、石灰石波特兰水泥 （LPC） 和石灰石煅烧粘土水泥 （LC3） 生产的水泥浆在生产后 1 至 7 天的粘弹性行为演变。使用一种创新的测试评估协议来确定弹性模量、蠕变模量和蠕变指数的值，而无需做出假设。LC3 浆料的 S 形收缩演变可以用波特兰石溶解和相关的化学收缩诱导的压应力重新分布到剩余的固体骨架来解释。LC3 浆料弹性刚度的演变可以用 C-A-S-H 相的空间填充来解释。LC3 浆料的小蠕变柔度可以用 C-A-S-H 小于 C-S-H 和 AFm 相来解释，它在 CSH 结构之间的纳米级狭缝孔中沉淀，粘合粘性界面。