石灰石粉复合低品位粉煤灰矿物掺合料性能研究

Research on the Properties of Limestone Powder and Low-quality Fly Ash Mineral Admixture

对镁质石灰石粉复掺粉煤灰对混凝土的影响进行了研究。通过对不同比例矿物掺合料和不同比例石灰石粉掺料下混凝土的工作性、强度和耐久性的试验和分析,研究石灰石粉复合低品位粉煤灰对混凝土性能的影响。试验表明:镁质石灰石粉对萘系减水剂的适应性较差;掺入石灰石粉可以使混凝土获得更好的工作性能;矿物掺合料的比例达到30%和40%时,石灰石粉在矿物掺合料中的比例大小对混凝土的强度影响不大;掺入石灰石粉的混凝土具有和掺入粉煤灰的混凝土同样良好的抗氯离子性能和抗碳化性能。

The effect of magnesium limestone replacement of low-quality fly ash concrete was investigated.The workability、compressive strength and durability of concrete were analyzed based on various proportions of mineral admixture and limestone powder.Testing results show： Magnesium limestone powder is poor on the adaptability of naphthalene super-plasticizer;Limestone powder can be mixed with the concrete to work better;When the mineral admixture radio get to 30% and 40%,limestone powder in the ratio of compound mineral admixture size has little effect on the strength of concrete;The concrete mixed with limestone powder has the same good performance with the concrete mixed with fly ash in anti-Cl-and anti-carbonation properties.