减水剂与磷建筑石膏基胶凝材料兼容性研究

以磷建筑石膏、粉煤灰、水泥、硅灰制备磷建筑石膏基胶凝材料。通过分析聚羧酸系减水剂(HC)、萘系减水剂(FDN)、木质素磺酸钙(MG)对磷建筑石膏基胶凝材料减水率、初凝时间、终凝时间、抗压强度、抗折强度、流动度经时损失等性能的影响,研究减水剂与磷建筑石膏基胶凝材料的兼容性。试验表明:萘系减水剂具有缓凝、增强的效果,与磷建筑石膏基胶凝材料兼容效果好;聚羧酸系减水剂在提高抗压强度、抗折强度方面有明显的优势;木质素磺酸钙具有促凝的效果,与磷建筑石膏基胶凝材料兼容效果较差。

Study on Compatibility between Superplasticizer and Phosphor Building Gypsum-Based Cementitious Material

The phosphor building gypsum-based cementitious material is prepared by phosphor building gypsum, fly ash, cement and silica fume. The compatibility between superplasticizer and phosphor building gypsum-based cementitious material is studied by effects of polycarboxylate superplasticizer (HC), naphthalene superplasticizer (FDN) and calcium lignosulfonate (MG) on properties of phosphogypsum-based cementitious materials about water reduction rate, initial setting time, final setting time, compressive strength, flexural strength, time dependency of fluidity. Tests show that: naphthalene superplasticizer have an effect on retardation and enhancement, which is strong compatible with phosphorus building gypsum-based cementitious material. Polycarboxylate superplasticizer has obvious advantages in improving compressive strength, flexural strength. Calcium lignosulfonate has the effect of promoting coagulation, which is weak compatible with phosphorus building gypsum-based cementitious material.