發(fā)布時間：2018-12-20 22:30

【摘要】：在石膏基復合膠凝材料優(yōu)化配合比的基礎上,研究了石膏原料煅燒溫度、萘系減水劑、聚羧酸減水劑、養(yǎng)護條件等因素對其性能的影響,借助掃描電鏡SEM、X射線衍射的表征手段,分析石膏基復合膠凝材料水化過程特點、凝結硬化作用機理。結果表明:當脫硫建筑石膏、粉煤灰、水泥、熟石灰用量分別為52%、25%、20%、3%,復合激發(fā)劑適量,基準水膠比0.40時,常溫自然養(yǎng)護條件下該復合材料28 d和56 d抗壓強度分別為24.25 MPa和26.20MPa,軟化系數(shù)0.816。常溫下粉煤灰水化反應條件不同于一般水泥基材料的情況,關鍵是控制堿性激發(fā)劑用量應適中。適宜蒸養(yǎng)工藝參數(shù)為70℃、24 h,還需再經(jīng)適當齡期常溫養(yǎng)護,可以顯著加快CSH凝膠和AFt的生成數(shù)量。
[Abstract]:On the basis of the optimized mix ratio of gypsum based composite cementing materials, the effects of calcination temperature of gypsum raw materials, naphthalene water reducer, polycarboxylic acid water reducer and curing conditions on the properties of gypsum composite cementitious materials were studied by means of scanning electron microscope (SEM,). The characteristics of hydration process and the mechanism of setting hardening of gypsum based composite cementitious materials were analyzed by means of X-ray diffraction. The results show that when the amount of desulphurized building gypsum, fly ash, cement and hydrated lime is 52% and 25% and 20% respectively, the compound activator is suitable, and the reference water-binder ratio is 0.40. The compressive strength of the composite is 24.25 MPa for 28d and 26.20MPa for 56d under natural curing condition at room temperature. The softening coefficient is 0.816. The hydration reaction conditions of fly ash at room temperature are different from those of common cement based materials. The key point is to control the amount of alkaline activator. The optimum steaming parameters were 70 鈩，

本文編號：2388520