萘系减水剂对发泡水泥浆体及制品的影响

Effect of Naphthalene Series Water Reducing Agent on Foaming Cement Paste and Products

以复合硅酸盐水泥和快硬硫铝酸盐水泥为胶凝材料,双氧水为发泡剂,硬脂酸钙为稳泡剂,硅灰和减水剂等原料为添加剂,制备了发泡水泥。采用旋转黏度计测量不同萘系减水剂用量发泡水泥浆体的黏度,采用紫外分光光度计测量出发泡水泥对不同用量萘系减水剂的吸附率,并测试分析了萘系减水剂对发泡水泥制品的抗折强度、吸水率及干密度等性能的影响。结果表明:浆体的黏度随萘系减水剂用量的增加而减小,发泡水泥对萘系减水剂的吸附率下降,在测试范围内,发泡水泥制品的干密度随萘系减水剂用量的增多而先减小后增大,抗折强度和抗压强度增加,吸水率先增大后减小,减水剂用量控制在一定范围内可有效提高发泡水泥的综合性能。

Foamed cement was prepared with composite portland cement and fast hardening sulphoaluminate cement as cementitious materials,hydrogen peroxide as foaming agent,calcium stearate as foam stabilizer,silica fume and water reducer as additives.The viscosity of foamed cement paste with different dosage of naphthalene series water reducing agent was measured by rotary viscometer,and the absorption rate of foamed cement to naphthalene series water reducing agent with different dosage was measured by ultraviolet spectrophotometer.The influence of naphthalene series water reducing agent on the flexural strength,water absorption and dry density of foamed cement products was tested and analyzed.The results showed that the viscosity of slurry decreased with the increase of naphthalene water reducer dosage,and the adsorption rate of foaming cement to naphthalene water reducer decreased.In the test range,with the increase of naphthalene water reducer dosage,the dry density of foaming cement products first decreased and then increased,the flexural strength and compressive strength increased,and the water absorption first increased and then decreased.The suitable amount of water reducer can effectively improve the comprehensive performances of foaming cement within a certain range.