矿渣-胶粉轻骨料混凝土早期力学性能的试验研究

Experimental Investigation on Early Mechanical Properties of Slag-Rubber Powder Lightweight Aggregate Concrete

采用正交试验方法研究了橡胶粉粒径、橡胶粉掺量、粒化高炉矿渣粉取代率对混凝土抗压强度、劈裂抗拉强度的影响,用Rapid Air 457气孔结构分析仪分析混凝土硬化气泡结构并运用灰色理论分析气泡参数与混凝土28 d强度之间的内在规律。试验结果表明:矿渣粉取代率为10%,橡胶粒径为120目(掺量为2%)时,混凝土的抗压强度和劈裂抗拉强度最高。橡胶粉的掺入可以明显提高混凝土的塑性性能。气泡参数中,平均孔隙半径是影响矿渣-胶粉轻骨料混凝土的抗压强度的主要因素。孔径参数中,500~1000μm的孔径是影响矿渣-胶粉轻骨料混凝土的抗压强度的主要因素。

The influences of three factors,including the size of rubber powder,contents of granulated blast furnace slag powder,substitution rate of granulated blast furnace slag powder,on the compressive strength,splitting tensile strength of concrete were investigated by utilizing the orthogonal testing method.RapidAir 457 stomatal analyzer was used to analyze the structure of concrete hardening bubbles and to analyze the inherent law between the bubble parameters and the strength of concrete 28 d by using gray theory.The test results indicate that the compressive strength and splitting tensile strength of concrete are the highest when slag replacement rate is 10%and rubber particle size is 120 mesh(content is 2%).The incorporation of rubber powder can significantly improve the plastic properties of concrete.In bubble parameters,the average radius is the main factor that affects the compressive strength of slag-rubber powder lightweight aggregate concrete.In the aperture parameters,the pore size of 500-1000μm is the main factor that affects the compressive strength of slag-rubber powder lightweight aggregate concrete.