超厚底板低水化热泵送混凝土研究

Research on pumped concrete about low heat of hydration

为解决超厚底板混凝土的温度裂缝问题,在综合防裂措施中采用低水化热的混凝土是非常有效的,结合沈阳地区2个厚度超过8 m的超厚底板混凝土的工程实际,探索了掺入大量降低水化热的复合掺合料(最高达到58%)和控制水化热技术,缓凝、泵送、防水一体化的技术。研究发现,过多粉煤灰掺量早期强度低,过多矿渣粉易开裂,较好的配合比关系是粉煤灰∶矿渣粉为1.5∶1,实测表明,浇筑后超厚混凝土底板内部最高温度为67℃。

To avoid thermal crack of superthick soleplate concrete,using concrete of low heat development is effective.based on projects of Shenyang, these technology which consist of concrete mixed with compound mineral admixture, controlling heat development heat and retarda- tion setting,pumping,water proofing are argued in the paper.The results show that the strength of concrete mixed with a large amount of fly ash is lower, and the concrete is apt to cracking, proper relations between fly ash and slag powder is 1.5 to 1, testing shows that the highest temperature of the concrete in its interior is 67 ℃.