【摘要】：利用粉煤灰/礦渣粉作為復(fù)合外摻料等量替代部分水泥,探究外摻合料的組成及摻量對箱梁C50混凝土工作性及力學(xué)性能的影響,并通過SEM觀察混凝土微觀結(jié)構(gòu),結(jié)果表明:復(fù)合摻合料中,粉煤灰與礦渣粉最佳質(zhì)量比為1∶2。外摻合料摻量從0%增至30%過程中,C50混凝土工作性有所改善,但混凝土3 d、10 d、28 d、56 d強(qiáng)度均隨外摻合料摻量增加而降低。通過SEM觀察,摻外摻合料體系水化生成的C-S-H凝膠數(shù)目較少,使得混凝土界面粘接強(qiáng)度不高,導(dǎo)致抗壓強(qiáng)度降低。
[Abstract]:Fly ash / slag powder is used as composite admixture to replace part of cement. The effect of composition and content of external admixture on workability and mechanical properties of box girder C50 concrete is investigated. The microstructure of concrete is observed by SEM. The results show that the optimum mass ratio of fly ash to slag powder is 1 鈮，

本文編號(hào)：2506708