复合胶凝剂和废玻璃钢纤维改性半水脱硫石膏
Modification on desulfurization gypsum by compound gelling agent and waste glass-reinforced plastic fiber
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摘要: 以工业副产物脱硫建筑石膏为原料，采用超细钢渣-矿渣-电石渣（SGC）复合胶凝剂和废玻璃钢纤维对其进行改性研究，得到适宜的改性条件为：复合胶凝剂适宜掺量为20%~25%，废玻璃钢纤维最佳长度为10~15 mm，适宜掺量为1.0%，且经过EDTA溶液浸泡处理的废玻璃钢纤维对石膏基体的改性效果较好。改性后石膏制品的软化系数提高到0.91，抗折强度为7.6 MPa，抗压强度为23.4 MPa，耐水性与力学强度显著提高，实现了不同工业废弃物的协同处置和脱硫石膏的高质化利用，也为难以处置的玻璃钢废弃物找到一种有效利用途径。Abstract: The semi-hydrated desulfurization gypsum is modified with steel slag-granulated blast-furnace slag-carbide slag (SGC)binder and waste glass-reinforced plastic fiber, and the appropriate modification conditions are obtained:the content of SGC 20% to 25%, the suitable content of waste glass fiber-reinforced plastic (WGFP) fiber, with the optimal length of 10 to 15 mm, is 1.0%. The WGFP fiber is better to be treated with EDTA solution. The softening coefficient of modified gypsum products increases to 0.91, the flexural strength is 7.6 MPa, the compressive strength is 23.4 MPa. The water resistance and mechanical strength of modified gypsum products are improved significantly. The co-processing of different industrial waste and high quality utilization of the desulfurization gypsum are realized, and by which, an effective way of waste GFRP utilization which is difficult to dispose is found.
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