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选用木钠减水剂、UEA-H膨胀剂、早强剂、柠檬酸缓凝剂以常用掺量外掺入矿粉水泥中,检测其化学收缩和干缩性能,同时将各掺量的外加剂分别引入到矿渣水泥混凝土中,检测其抗压强度以及早期抗裂性能,结果表明:木钠减水剂增加矿渣水泥的早期化学收缩,也增大矿渣水泥胶砂的干缩值;UEA-H膨胀剂增加矿渣水泥的化学收缩,并能降低矿渣水泥胶砂的干缩;早强剂则在早期就大幅度增加矿渣水泥的化学收缩,对胶砂体系干缩性能影响与基准矿渣水泥体系相当;柠檬酸缓凝剂能降低矿渣水泥的化学收缩值,但会提高胶砂体系的干缩值。木钠减水剂、UEA-H膨胀剂和早强剂都能提高矿渣水泥混凝土的早期抗裂性能,其中早强剂在所选用的几种外加剂中效果最好,而缓凝剂对矿渣水泥混凝土早期抗裂性能具有不利影响。
Use of sodium superplasticizer, UEA-H expansive agent, early strength agent, citric acid retarder outside the usual dosage of slag powder mixed with cement to detect the chemical shrinkage and shrinkage properties, while the amount of the additional Agent were introduced into the slag cement concrete to test its compressive strength and early crack resistance, the results show that: the sodium superplasticizer increases the early chemical shrinkage of slag cement, but also increase the shrinkage value of slag cement mortar; UEA- H expansive agent to increase the chemical shrinkage of slag cement and reduce the dry shrinkage of slag cement mortar; Early strength agent in the early substantial increase in chemical shrinkage of slag cement, rubber mortar shrinkage drying system and the benchmark cement system Equivalent; retarder citric acid can reduce the chemical shrinkage value of slag cement, but will increase the drying shrinkage value of the mortar system. The sodium sulfite superplasticizer, UEA-H expansive agent and early strength agent can all improve the early crack resistance of slag cement concrete. Among them, the early strength agent is the best one among several admixtures, Early cracking resistance of cement concrete has an adverse effect.