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采用新研制的智能型非接触式微位移传感器法对加掺合料高性能混凝土从成型后6h到3d龄期内的自生收缩和单面干燥条件下的总收缩进行试验研究,同时测量了不同龄期混凝土的强度和试件的重量损失。结果表明:掺入硅灰会略微增加混凝土早期自生收缩,而对早期干燥收缩影响不大;粉煤灰的掺入能大幅度地减小混凝土早期自生收缩,但使早期干燥收缩增加;磨细矿渣只有在掺量较多时才能明显降低早期自生收缩,却对早期干燥收缩不利。同水胶比加掺合料混凝土的早期自生收缩与抗压强度之间有很好的线性关系。
The newly developed intelligent non-contact micro-displacement sensor method was used to test the self-shrinking and single-side drying shrinkage of high performance concrete with admixture from 6h to 3d after forming. The effects of different age The strength of concrete and specimen weight loss. The results show that the incorporation of silica fume will slightly increase the early spontaneous shrinkage of concrete, but has little effect on the early drying shrinkage. The addition of fly ash can greatly reduce the early autogenous shrinkage of concrete but increase the early drying shrinkage. Slag only significantly reduces the early spontaneous contraction when the dosage is high, but it is unfavorable to the early drying shrinkage. There is a good linear relationship between the early autogenous shrinkage and the compressive strength of water-cement ratio plus admixture concrete.