建筑垃圾低强度CFG桩桩身材料性质试验研究

Experimental Study on Material Properties of Construction Waste Low- strength CFG Pile

对建筑垃圾（废混凝土）再生骨料的基本物理力学性质和不同配合比的建筑垃圾低强度（≤C7.5）CFG桩桩身材料试件强度进行了试验研究,结果表明：（1）建筑垃圾再生骨料可满足作为低强度CFG桩桩身材料的骨料要求;（2）建筑垃圾低强度CFG桩桩身材料早期强度较低,但28-90d龄期内的后期强度仍有一定增长;（3）建筑垃圾低强度CFG桩桩身材料中的粉煤灰掺量和粉煤灰取代水泥率可适当加大;（4）32.5复合硅酸盐水泥可用于强度等级小于C7.5的建筑垃圾CFG桩桩身材料中。

The basic physical and mechanical properties of the recycled aggregate from the construction waste（ concrete） and the material strength of the construction waste low- strength（ ≤C7. 5） CFG piles with different mix proportions have been tested in the laboratory. The result shows：（ 1） The recycled aggregate is qualified to be the material of the low- strength CFG pile;（ 2） the early strength of the construction waste low- strength CFG pile is relatively low,but there is an increase in the post strength at the period of 28 d - 90d;（ 3） the proportion and the replacement rate of fly ash can be appropriately increased in the construction waste low- strength CFG pile;（ 4） P. C 32. 5 cement can be used in construction waste low- strength（ C7. 5） CFG piles.