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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。
In order to study the influence of mineral admixture on self-shrinkage of high-performance concrete and its calculation model, concrete self-shrinking non-contact automatic test equipment was used to carry out fly ash content and quality, fly ash and metakaolin complex admixture and fly ash Effect of slag doping on self - shrinkage of high performance concrete. The results show that with the increase of fly ash content, the self-shrinkage value of high performance concrete decreases. At the same dosage, improving the quality of fly ash can reduce the self-shrinkage of high performance concrete. In the fly ash high performance concrete complex metakaolin will increase its self-shrinkage value; Fly ash and slag complex can further reduce the self-shrinkage of high performance concrete, and the ratio of 1: . By comparing and analyzing the existing self-shrinkage calculation model and experimental data, the self-shrinkage calculation model of high performance concrete is put forward. The calculated results are in good agreement with the experimental results.