Anti-ultraviolet Aging Of PTN Bitumen Polyurethane Joint Material

At present, PTN materials are widely used in the settlement joints, expansion joints, construction joints of channels, aqueducts, levees etc. PTN materials have many features.Such as strong cohesiveness, good water effect, excellent high and low temperature performance, a degree of elasticity and simple construction etc. Ultraviolet aging of polymer materials is a common fault, studying PTN materials ultraviolet aging performance, summarizing PTN materials ultraviolet aging law, can predict PTN materials engineering life. Now, have not yet found a sealant ultraviolet aging performance research, therefore, the study has certain innovative and certain reference value for other types of polymer sealant materials ultraviolet aging performance study.This paper firstly determined the PTN materials A and B by three kinds of proportion of 1:1, 1:2 and 1:3. Test, tests PTN materials blank group, artificial ultraviolet aging group, natural ultraviolet aging group of hardness, tensile properties, tensile bond properties. Before testing tensile bond properties, need to test three kinds of new interface materials and concrete bonding performance in different operating conditions, choose the best interface materials. The main test contents and the results are as follows:(1) The determination of blank group, artificial ultraviolet aging group and natural ultraviolet aging group of hardness value. Experimental data show that: as the group B content increases hardness decreases; in the same proportion, as the aging time increases hardness decreases.(2) The determination of blank group, artificial ultraviolet aging group and natural ultraviolet aging group of tensile strength and elongation at break. Experimental data show that: as the group B content increases the tensile strength decreases, as the group B content increases elongation at break increases; in the same proportion, as the aging time increases tensile strength and elongation at break decrease; when the artificial aging 300 d, material surface lose structure, lose tensile properties. PTN materials fatigue damage.(3) The determination of three kinds of new interface materials and concrete bonding performance in high and normal temperature. Experimental data show that: polyurea base on the tensile properties of different operating conditions is better than the other two new interface materials, party A and B component proportion is 1.5:0.5 the largest tensile strength and elongation at break.(4) The determination of blank group, artificial ultraviolet aging group and natural ultraviolet aging group of tensile bond strength and tensile bond elongation at break. Experimental data show that: as the group B content increases the tensile bond strength decreases, as the group B content increases tensile bond elongation at break increases; in the same proportion, as the aging time increases tensile bond strength and tensile bond elongation at break decrease; when the artificial aging 300 d, material surface lose structure, but it does not affect the performance of tensile bond properties below the surface of materials.PTN materials still have engineering strength, can be used continually.(5) There is a project life-style model of relationship between artificial ultraviolet aging and natural ultraviolet aging tension bond strength, a relationship with the tensile bond elongation at break. So it can predict PTN materials engineering life can reach more than 80.(6) Scanning electron microscopy photos show that: as ultraviolet aging time increases, surface aging damage, part of the surface of the aging will act as a protective layer to prevent ultraviolet radiation of the lower material.Therefore, thin samples than thick samples are prone to ultraviolet aging.