Volumetric deformation of gap-graded blended cement pastes with large amount of supplementary cementitious materials
Volumetric deformation of gap-graded blended cement pastes with large amount of supplementary cementitious materials
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DOI：
10.1016/j.conbuildmat.2013.12.053
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发表时间：
2014-03
影响因子：
7.4
通讯作者：
Tongsheng Zhang;P. Gao;Ruifeng Luo;Jiangxiong Wei;Q. Yu
中科院分区：
文献类型：
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作者：
Tongsheng Zhang;P. Gao;Ruifeng Luo;Jiangxiong Wei;Q. Yu
本文研究了掺入大量辅助胶凝材料的GAP级配水泥浆体的体积变形，并与硅酸盐水泥和基准混合水泥浆体的体积变形进行了比较。结果表明，GAP级配水泥浆体具有较高的初始堆积密度，因此需要较少的水化产物才能获得致密的微观结构，从而导致较小的化学收缩。值得注意的是，GAP级配水泥的大部分化学收缩发生在骨架结构形成之后，因此由于骨架结构的约束，GAP级配水泥的自收缩显著降低。此外，GAP级配水泥浆体由于颗粒细化和明显的水化作用，其微观结构致密均匀，收缩应力小且分布均匀。结果表明，GAP级配混合水泥浆体变形小，抗裂性能优于硅酸盐水泥和基准水泥浆体。
In this study, volumetric deformation of gap-graded blended cement pastes with large amount of supplementary cementitous materials was investigated and compared with those of Portland cement and reference blended cement pastes. The results show that the gap-graded blended cement pastes presented a higher initial packing density, therefore smaller amount of hydration products was needed to achieve dense microstructure, resulting in smaller chemical shrinkage. Notably, most of chemical shrinkage of gap-graded blended cements was occurred after the formation of skeleton structure, thus the autogenous shrinkage of gap-graded blended cements was reduced significantly due to restraint of the skeleton structure. Further, the microstructure of gap-graded blended cement pastes was dense and homogeneous due to grain size refinement and significant hydration of GBFS, and shrinkage stress was small and uniformly distributed. As a result, gap-graded blended cement pastes presented smaller volumetric deformation and superior resistance to cracking than Portland cement and reference cement pastes.