In order to study the influence of high-volume slag and limestone powder on the shrinkage performance of concrete under different water-binder ratios,30％and 20％cement were replaced by high-volume slag and limestone powder respectively,and compared with the benchmark silicate concrete.The shrinkage performance change of concrete under the joint action of double-doped slag and limestone powder under different water-binder ratios was derived,and the shrinkage curve of double-doped concrete was predicted by the model.The test results show that:(1)The self-shrinkage and drying shrinkage of concrete will decreases with the increase of water-binder ratio.(2)The large amount of slag and limestone powder replacing cement is not conducive to the self-shrinkage and drying shrinkage of concrete,which is related to the respective amounts of slag and limestone powder.(3)Slag-limestone powder concrete autogenous shrinkage curve and drying shrinkage curve trend is roughly the same as the reference concrete,and double concrete autogenous shrinkage and drying shrinkage difference compared with the reference concrete,will gradually shrink with the increase of age.(4)It takes the form of a logarithmic function of the slag-limestone powder concrete shrinkage-age curve to make model predictions,with good corrclation.the American Concrete Institute(ACI)recommended concrete shrinkage equation in the form of hyperbolic function correlation is better.
关键词
矿渣-石灰石粉混凝土/自收缩/干燥收缩/模型预测
Key words
slag-limestone concrete/autogenous shrinkage/drying shrinkage/predict model
维普
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