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Effect of shrinkage reducing admixture on early expansion and strength evolution of calcium sulfoaluminate blended cement

机译：收缩减少混合物对磺酸钙硫铵混纺水泥早期膨胀和强度演化的影响

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摘要

This research examines the influence of presence of shrinkage reducing admixture (SRA) on expansion, hydration, and strength evolution of calcium sulfoaluminate-based expansive agent (CSA-based EX) blended with ordinary portland cement (OPC) in the absence of initial moist curing. The performance of inclusion of SRA in OPC-CSA system and without moist curing was compared to the moist-cured OPC-CSA system made without any SRA. The investigation uses the measurements of cement hydration from isothermal calorimetry, autogenous and drying volume changes, internal relative humidity, X-ray diffraction (XRD), and thermogravimetry, as well as compressive strength to characterize the expansion and hydration of OPC-CSA mortar systems. The results indicate that under unsealed conditions, the expansion and strength evolution of OPC-CSA system is significantly sensitive to the presence of moist curing. Mortar containing 15% CSA-based EX resulted in no expansion and had comparable magnitude of total deformation to that of the plain OPC system when no moist curing was adopted. This is linked to the: (i) reduced ettringite formation; and (ii) decreased stiffness which translates to the lower resistance to deformation. Analysis of calorimetry, XRD pattern, and thermogravimetry indicates the synergistic effect of using SRA in OPC-CSA system, which contributes towards higher early-age expansion and increased later-age strength compared to the similar system made without any SRA. In the absence of moist curing, the OPC-CSA system containing SRA exhibited 20% higher non-evaporable water content than OPC-CSA system alone, confirming the effect of SRA addition on hydration reaction progress of OPC-CSA system. The outcomes of this research provide insights into formulation of CSA-based suspensions with the aim of reduced shrinkage, when insufficient initial moist curing is applied.
机译：本研究检测收缩减少混合物（SRA）对氟丙酸钙的膨胀，水合和强度演进的影响，在没有初始潮湿固化的情况下与普通植物水泥（OPC）混合的膨胀性，水合和强度演化。将SRA在OPC-CSA系统中含有的性能和没有湿润固化的比较，与没有任何SRA的湿固化OPC-CSA系统。该研究使用来自等温热量的水泥水合的测量，自生和干燥体积变化，内部相对湿度，X射线衍射（XRD）以及热重定义，以及抗压强度，表征OPC-CSA砂浆系统的膨胀和水合。结果表明，在未密封的条件下，OPC-CSA系统的膨胀和强度演化对湿固化的存在显着敏感。砂浆含有15％CSA的EX，导致没有膨胀，并且当未采用湿润固化时，普通OPC系统的总变形的相当大。这与：（i）减少了eTtringite形成; （ii）降低刚度，转化为较低抗变形性。热量测定法，XRD图谱和热重试验表明，在OPC-CSA系统中使用SRA的协同效应，与没有任何SRA的类似系统相比，有助于更高的早期扩张和增加的后续年龄强度。在没有湿润固化的情况下，含有SRA的OPC-CSA系统单独表现出比OPC-CSA系统更高的非蒸发水含量，证实了SRA加法对OPC-CSA系统的水化反应进展的影响。该研究的结果为基于CSA的悬浮液的制定提供了洞察，目的是在应用不充分的初始潮湿固化时的收缩。

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