Obviously, the addition of polypropylene fibers is significant in controlling plastic shrinkage cracks in the early stage and improving ductility for concrete at low fiber volume fraction.

低掺量的聚丙烯纤维掺入混凝土后可显著控制混凝土早期收缩裂缝，提高混凝土的耐久性。

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The autogenous shrinkage of HPC develops greatly and mainly during early age due to a low water binder ratio, but there is no standard test method for early autogenous shrinkage of the concrete.

高性能混凝土因水胶比低、自收缩大且主要发生在早期，而目前对于早期自收缩的测量还没有统一标准可依。

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Aiming at these defects, a kind of special mortar for plastering aerated concrete with good workability, good water retention, high bonding strength and low shrinkage ratio has been prepared.

针对这些缺陷，研制了一种和易性好、保水性好、粘结强度高、收缩率低，适合加气混凝土抹灰用的砂浆。

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