Abstract
With advances in construction industry, restraining the shrinkage cracking of cement-based materials has become increasingly prominent. Shrinkage reducing admixtures (SRA) can reduce the shrinkage of materials. SRA with low surface tension can effectively reduce shrinkage, but some problems such as strength reduction and compatibility exist. The shrinkage reduction effect is more obvious when SRA is mixed with other admixtures, such as expansion agent, superabsorbent polymers, fiber and so on. The shrinkage inhibition effect of SRA is not only related to its surface tension, but also related to the hydration products and micropore structure of the hardened cement paste material. This paper reviews contemporary findings on the influence of SRA on the properties of cement-based materials, and summarises and prospects the problems existing in the SRA
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