矿物掺合料对高性能混凝土自收缩影响及计算模型研究

为研究矿物掺合料对高性能混凝土自收缩的影响及其计算模型,采用混凝土自收缩无接触自动测试装置进行粉煤灰掺量及品质、粉煤灰与偏高岭土复掺及粉煤灰与矿渣复掺对高性能混凝土自收缩性能的影响。研究结果表明:随着粉煤灰掺量的增加,高性能混凝土的自收缩值随之下降;在同掺量下,提高粉煤灰的品质可降低高性能混凝土的自收缩值。在粉煤灰高性能混凝土中复掺偏高岭土会增大其自收缩值;粉煤灰与矿渣复掺可进一步降低高性能混凝土的自收缩值,且在复掺比例为1∶1时最佳。通过对现有混凝土自收缩计算模型与试验数据对比分析,提出高性能混凝土自收缩计算模型,该模型计算结果与试验结果吻合良好。

Effects of mineral admixtures on autogenous shrinkage of high-performance concrete and its computation model establishment

To study the effects of mineral admixtures on the autogenous shrinkage of high-performance concrete(HPC),the non-contact automatic testing device was used to test the autogenous shrinkage of HPC.It can be concluded that,the autogenous shrinkage of HPC decreases with the increase of the content or the quality of fly ash.The autogenous shrinkage of HPC mixed with metakaoli and fly ash is higher than HPC only with fly ash.However,the mixing of fly ash and slag may reduce the autogenous shrinkage of HPC.And,the...