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开展了不同粒径骨料机制砂自密实混凝土构件的性能研究.结果表明:不同粒径骨料机制砂自密实混凝土工作性能良好,其抗压强度及密实度较大.相比普通粒径骨料机制砂自密实混凝土,超大粒径和大粒径骨料机制砂自密实混凝土内部温峰降低18~23℃,温峰出现时间延长4~9h,但是,其构件受弯极限载荷较低,且所受弯矩越大,超大粒径骨料的尺寸影响效应越明显.超大粒径及大粒径骨料的粒径、堆积程度、分布状态、界面黏结情况是影响机制砂自密实混凝土构件受力性能,尤其是抗弯拉性能的关键因素.
The performance of self-compacting concrete with different particle size aggregate mechanism sand was studied.The results show that the workability of self-compacting concrete with different particle size aggregate mechanism sand is good, the compressive strength and the compactness are higher than ordinary size bone The internal temperature peak of the self-compacting concrete with self-compacting concrete, ultra-large particle size and large particle size aggregate self-compacting concrete decreased 18 ~ 23 ℃ and the peak temperature appeared 4 ~ 9h. However, the flexural ultimate load of the self- And the larger the bending moment, the more obvious the effect of the size effect of the super-large-size aggregate.The size, accumulation, distribution and interface bonding of the super-large and large-size aggregates are the factors that affect the self- Force performance, especially the key factor of bending resistance.