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为制成玻璃纤维增强水泥制品需要一种具有一定强度和碱度较低对玻璃纤维侵蚀性小的水泥。根据CaO-Al_2O_3-CaSO_4-H_2O和CaO-SiO_2-H_2O 相图,水泥水化物中钙矾石的最低 CaO平衡浓度比C-S-H 低;同时在钙矾石析晶面上,与最低CaO 浓度的液相相平衡的固相必须是钙矾石、二水石膏和水化氧化铝凝胶。本试验采用 C_4A_3S、C_2在等单矿物和CaO、CaSO_4化学试剂配制成混合物,用化学、X射线、差热、pH等分析方法,着重对水化混合物的碱度以及与最低碱度的液相平衡的水化产物进行了研究。调整石膏和CaO量,在水化达到平衡后测出各混合物在相图上的相应位置和平衡液相可能达到的最低CaO 浓度。试验和实践表明,Ⅰ型低碱度水泥水化后的液相,其化学成分、碱度和水化产物属于CaO-Al_2O_3-CaSO_4-H_2O 相图的最低范围(即CaO 的浓度为17.7mg/l),用这种水泥配制的玻璃纤维水泥制品,具有较好的耐久性。
In order to make a glass fiber reinforced cement product, a cement having a certain strength and a low alkalinity which is less aggressive to glass fibers is required. According to the CaO-Al 2 O 3 -CaSO 4 -H 2 O and CaO-SiO 2 -H 2 O phase diagrams, the lowest CaO balance concentration of ettringite in the cement hydrate is lower than that of CSH; meanwhile, the liquid phase equilibrium with the lowest CaO concentration on the crystallization face of the ettringite The solid phase must be ettringite, dihydrate gypsum, and hydrated alumina gel. This test uses C_4A_3S, C_2 in a mixture of single minerals and CaO, CaSO_4 chemical reagents, chemical, X-ray, differential heat, pH and other analytical methods, focusing on the alkalinity of the hydration mixture and the liquid phase with the lowest alkalinity Balanced hydration products were studied. Adjust the amount of gypsum and CaO, and after hydration reaches equilibrium, measure the corresponding position of each mixture on the phase diagram and the lowest possible CaO concentration that the equilibrium liquid phase can reach. Tests and practices have shown that the chemical composition, alkalinity, and hydration products of the liquid phase after hydration of Type I low-alkalinity cements fall within the lowest range of the CaO-Al 2 O 3 -CaSO 4 -H 2 O phase diagram (ie, the CaO concentration is 17.7 mg/L). l) Glass fiber cement products formulated with this cement have good durability.