何若楠,王元纲,黄凯健,陶有华,黄 权,张高勤
何若楠,王元纲,黄凯健,等.钢渣微粉及复合掺合料对水泥和自密实混凝土性能的影响[J].混凝土与水泥制品,2019(6):88-93.
HE R N,WANG Y G,HUANG K J,et al.The Influence of Steel Slag Powder and Compound Admixture on Performance of Cement and Self-compacting Concrete (SCC)[J].China Concrete and Cement Products,2019(6):88-93.
钢渣微粉及复合掺合料对水泥和自密实混凝土性能的影响
何若楠,王元纲,黄凯健,陶有华,黄 权,张高勤
何若楠,王元纲,黄凯健,等.钢渣微粉及复合掺合料对水泥和自密实混凝土性能的影响[J].混凝土与水泥制品,2019(6):88-93.
HE R N,WANG Y G,HUANG K J,et al.The Influence of Steel Slag Powder and Compound Admixture on Performance of Cement and Self-compacting Concrete (SCC)[J].China Concrete and Cement Products,2019(6):88-93.
摘 要:为扩大钢渣微粉在自密实混凝土(SCC)中的应用,采用标准试验方法研究了钢渣微粉及复合掺合料对硅酸盐水泥凝结时间、SCC拌和物填充性及凝结时间的影响。结果表明,钢渣微粉对水泥净浆的凝结具有明显的延缓作用,钢渣微粉掺量越大,水泥的凝结时间就越长;与钢渣微粉相比,复合掺合料的缓凝作用明显减小。采用钢渣微粉掺量为10%~50%,并按SF1级坍落扩展度要求配制的SCC拌和物具有良好的填充性;掺比例为1∶1的钢渣微粉-粉煤灰复合掺合料时,SCC拌和物的填充性明显提高。掺加钢渣微粉使SCC拌和物的凝结时间明显延长;与单掺钢渣微粉相比,掺比例为1∶1的钢渣微粉-矿渣微粉复合掺合料对SCC拌和物凝结时间的影响显著减小。
Abstract: In order to expand the application of steel slag powder in self-compacting concrete(SCC), the effects of steel slag powder and compound admixtures on setting time of portland cement paste, filling ability and setting time of SCC mixture were studied by standard test methods. The results show that steel slag powder has obvious retarding effect on the setting of cement paste. The larger the content of steel slag powder mixing in cement, the longer the setting time of cement paste. Compared with the steel slag powder, the retarding effect of compound admixtures is obviously reduced. The SCC mixtures with 10%~50% steel slag powder according to slump-flow requirements of SF1 grade have good filling ability. When the steel slag powder-fly ash compound admixture is mixed with a ratio of 1∶1, the filling ability of SCC mixture can be obviously improved. The setting time of SCC mixture is obviously prolonged by mixing with steel slag powder. Compared with the single steel slag powder, the effect of the steel slag powder-slag powder compound admixture with a ratio of 1∶1 on the setting time of SCC mixture is significantly reduced.
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