复合助剂改性混凝土的韧性与刚性研究

采用正交试验研究了水胶比、胶粉掺量、硅粉掺量以及消泡剂掺量对混凝土的韧性与刚性的影响规律。结果表明:四个因素对混凝土的折压比影响的主次顺序是胶粉掺量最大,消泡剂掺量次之,水胶比第三,硅粉掺量最小;而对于弹性模量影响的主次顺序是胶粉掺量最大,硅粉掺量次之,消泡剂掺量第三,水胶比最小。胶粉能显著提高混凝土的折压比,改善混凝土的韧性;且胶粉掺量越大,效果越明显。组成参数为水胶比0.35、胶粉掺量8.0%、硅粉掺量6.0%、消泡剂掺量0.8%的复合助剂改性混凝土混凝土,其抗折强度为7.05 MPa,折压比为0.159,弹性模量为20.16 GPa,其综合力学性能良好,韧性最大,适合用作混凝土路面材料。

Toughness and Rigidity of Composite Additives Modified Concrete

The effects of water-cement ratio, latex powder, silica fume and defoamer on the toughness and rigidity of composite additives modified concrete were studied by orthogonal experiment in this paper. The results show that in the given value range of each factor, latex powder has the greatest effect on ratio of bending strength to compressive strength(RBSCS) , next comes defoamer, thirdly comes water-cement ratio followed by silica fume, while on elastic modulus, the corresponding order is latex powder, silica fume, defoamer, water-cement ratio. Latex powder can improve RBSCS and toughness of concrete greatly, and the effect is more obvious with the adding amount increasing. When the mixSparameters are water-cement ratio 0.35, latex powder content 8.0%, silica fume content 6.0% and defoamer content 0.8%, the bending strength of composite additives modified concrete is 7.05 Mpa, RBSCS is 0.159, elastic modulus is 20.16 Gpa, so it is suitable for concrete pavement material.