化学发泡陶粒泡沫混凝土力学及热工性能研究

Mechanical and thermal properties of ceramsite foamed concrete prepared with chemical foaming method

为改善泡沫混凝土的抗裂性能和热工性能,利用双氧水、陶粒、玻化微珠、玻璃纤维、水泥等材料,通过化学发泡法制备玻璃纤维增强型陶粒泡沫混凝土砌块,并采用单因素控制变量法进行顺序试验,分析了各因素对材料力学性能和热工性能的影响,通过多元线性回归得出满足劈拉强度在0.80～0.90 MPa、抗压强度在7.0～8.0 MPa的泡沫混凝土砌块最优配合比。结果表明：泡沫混凝土脆性随双氧水、玻化微珠和陶粒用量的增加而显著增大;玻璃纤维既可提高泡沫混凝土强度,又可改善其热工性能。当双氧水、玻璃纤维、玻化微珠和陶粒掺量分别为水泥质量的7.5%、1.0%、8.5%和8.5%时,泡沫混凝土导热系数为0.203 W/（m·k）,劈裂抗拉强度达到0.81 MPa,抗压强度达到7.3 MPa。化学发泡法制备的玻璃纤维增强型陶粒泡沫混凝土拉压比高,保温性能好。

In order to improve crack resistance and thermal properties of foamed concrete,hydrogen peroxide,ceramsite,glazed hollow bead,glass fiber,and cement were used to prepare glass fiberreinforced ceramsite foamed concrete blocks with the chemical foaming method. A single factor control variate method was used to test the blocks,and the effect of various factors on mechanical and thermal properties of the concrete was analyzed. An optimal mixture ratio was obtained through a multiple linear regression analysis. The splitting tensile strength of the foamed blocks was between0. 80 MPa and 0. 90 MPa,and the compressive strength was between 7. 0 MPa and 8. 0 MPa. Results show that the brittleness of foamed concrete corresponds with the increase of the hydrogen peroxide and glazed hollow bead contents. Glass fiber can improve the splitting tensile strength and thermal performance of foamed concrete. When the hydrogen peroxide,glass fiber and glazed hollowbeads are 7. 5%,1. 0%,8. 5% and 8. 5% of the cement mass content,respectively,the thermal conductivity of foamed concrete is 0. 203 W /（ m·k）,the splitting tensile strength is 0. 81 MPa,and the compressive strength is 7. 3 MPa. Glass fiber-reinforced ceramsite foamed concrete prepared with the chemical foaming method,have high ratio of tension to compression and good thermal properties.