有机纤维与聚合物对水泥混凝土层间黏结性能影响研究

摘要

Adding organic fiber and polymer into cement concrete is used to increase the interlayer bonding performance. The impact of organic fiber and polymer on the interlayer bonding performance was studied by shear strength and tensile strength test. The mix design of the interface agent was optimized through the tensile bending tests of different fiber and polymer dosage. The impact of casting meth-ods and interface agent mix was studied through tests. The test results show that adding organic fiber and polymer into cement concrete could significantly increase the interlayer bond strength. The interface agent of SBR( styrene-butadiene rubber)latex modified cement paste has better tensile bonding properties. When the ratio of cement to DB-1 latex is 3:2,it will effectively increase the interlayer bonding performance of cement concrete.%水泥混凝土中掺加有机纤维或聚合物能够提高其层间黏结性能。通过层间抗剪强度试验和层间抗拉强度试验方法研究了掺加有机纤维与聚合物对提高水泥混凝土层间黏结强度的效果。对比研究在不同聚合物改性水泥净浆作为界面剂的条件下，水泥混凝土抗拉黏结性能受影响的情况，并对界面剂的配合比；并通过劈裂抗拉黏结性能试验，研究了影响界面黏结性能的浇筑方式和界面黏结剂配合。结果表明：将有机纤维与聚合物掺入水泥混凝土中能够显著提高层间黏结强度，其中丁苯DB-1乳液改性水泥净浆效果最优，尤其当改性水泥净浆作为界面剂的掺量配合比为水泥：DB-1乳液＝3：2时，新老混凝土可得到较好的层间黏结性能。