石灰石粉与不同矿物掺合料复掺对高强自密实混凝土性能的影响

Influence of compounding lime stone pow der and different mineral admixture on properties of high strength self compacting concrete

基于混凝土的自密实性能和强度试验结果,研究了石灰石粉分别与粉煤灰、矿粉和硅灰3种不同矿物掺合料复掺组合对高强自密实混凝土性能的影响。结果表明:在合适的掺量范围和复配合比例条件下,将低活性的石灰石粉与高活性的硅灰复掺有很好的互补效应,对混凝土的自密实性能和强度产生了积极影响;石灰石粉与矿粉复掺不仅可以改善混凝土的自密实性能,同时也能满足高强要求。石灰石粉与硅灰、石灰石粉与矿粉复掺组合是制备高强自密实混凝土的有效技术手段。石灰石粉与粉煤灰复掺虽然显著提高了混凝土的自密实性能,但是不能满足高强要求,只能制备中、低强度自密实混凝土。

Based on the self compacting properties and strength test results of concrete,This paper studies the influence of compounding lime stone powder and other three different mineral admixtures,including fly ash,mineral powder and silica fume,on the properties of high strength self compacting concrete.The results show that:in the dosage range of appropriate proportion and conditions,the low activity of limestone powder and high active silica fume has complementary good effect,and a positive impact on the concrete self compacting performance and strength.The addition of limestone powder and mineral powder can not only improve the self compacting performance of concrete,but also meet the requirements of high strength.The combination of limestone powder and silica fume,limestone powder and mineral powder are effective methods to prepare high strength self compacting concrete.The addition of limestone powder and fly ash can remarkably improve the self compacting performance of concrete,but it can not meet the requirements of high strength.Only medium and low strength self compacting concrete can be prepared.