石膏基复合材料性能影响因素的研究

从材料组分、缓凝剂掺量和水灰比,采用正交实验方法研究各因素对石膏基复合材料性能影响的规律。结果表明,石膏基复合材料的强度和软化系数均明显高于纯石膏;硅酸盐水泥对复合材料具有明显的促凝作用,当掺量在10%～15%时,水泥能提高石膏基复合材料的强度和软化系数,掺量过大,则会导致材料强度和软化系数下降;磷酸盐缓凝剂改变了二水石膏晶体生长习性和材料内的孔径分布,使得晶体粗化,孔结构劣化,最终导致强度下降。

Research on contributing factors of gypsum-based composite material performance

The rules of various factors influence the gypsum-based composite material(GBCM) performance are studied,using orthogonal experiment from the material components,retarder dosages and different w/c ratio.The results show that the strength and softness coefficient of GBCM are obviously higher than that of pure gypsum.The Portland cement can markedly accelerate the coagulation of GBCM,when its mixed amount is 10%~15% it can enhance the strength and softness coefficient of GBCM but overdosage will cause fall of the strength and softness coefficient of GBCM.The phosphate retarder changes the growth habit of dehydrate gypsum crystal and the aperture distribution of GBCM,which correspondingly makes the crystal thickening and the pore structure deteriorating,and ultimately leads to reduce the strength of GBCM.