通过胶砂强度、热分析、扫描电镜等测试手段研究了不同掺合料在蒸汽养护条件下的水化行为。试验结果表明,在90℃的蒸汽养护条件下,矿粉和粉煤灰能够部分消耗水泥水化产生的Ca(OH)2,因而具有较高的抗压强度,而磨细石英砂没有参与水化反应。在180℃、1MPa蒸汽养护条件下,所有矿物掺合料都与水泥水化产生的水化产物发生充分的化学反应,其中磨细石英砂与水泥水化生成的氢氧化钙以及硅酸钙反应生产致密的水化产物,因而能够大幅度地提高抗压强度。
Hydration characteristics of mineral admixture under steam curing condition were studied by compressive strength test, differential scanning calorimetry( DSC) and scanning electron microscope( SEM) . The results indicate that Ca( OH) 2 produced by the hydration of cement is partially consumed by ground granulated blast furnace slag(GGBS) and fly ash (FA),but the ground quartz ( GQ) does not take part in reaction under steam curing of 90 ℃ and normal pressure. When the paste is cured under the condition of 180 ℃ and 1MPa pressure, all the mineral admixtures react heavily with the hydration product of cement. The GQ reacts with both Ca( OH) 2 and C-S?H, forming compact hydration product,which makes great contribution to compressive strength.