超细矿渣对高强混凝土补偿收缩性能的影响

Effect of the Superfine Slag on the Shrinkage-Compensating Performance of the High Strength Concrete (HSC)

研究了超细矿渣对高强混凝土和补偿收缩混凝土的收缩、膨胀性能的不同影响。研究结果表明 ,掺加超细矿渣可降低高强混凝土的收缩 ,因掺加矿渣后可减少用水量 ,保证孔体系中的相对湿度仍近于 10 0 % ;另一方面 ,由于矿渣具有微集料效应和火山灰效应 ,可生成致密的水化C -S -H凝胶 ,填充了孔隙 ,从而降低了干缩。掺加超细矿渣却使补偿收缩混凝土的膨胀量降低 ,因掺加矿渣后火山灰反应消耗了Ca(OH) 2 ,降低了水泥石溶液的碱度 。

In this paper,dealt with are the different effects of the superfine slag on the shrinkage and expansivity of the high strength concrete (HSC) and the shrinkage-compensating concrete.The result of aforesaid research indicates that shrinkage of HSC can be reduced by adding superfine slag,for,slag having been added,water consumption can be decreased so that the relative humidity of the porocity system can be ensured to be near to the 100%.On the other hand,because the slag has fine filler and pozzuolanic effects,it can produce the solid C-S-H gel to fill the pores so as to reduce the dry shrinkage.Adding superfine slag can also lower the expansivity of the shrinkage-compensating concrete,for,in this case,pozzuolanic reaction consumes calcium hydroxide,reduces solution basicity of cement stone and,as a result,changes the properties of ettringites.