道路有机硅密封胶的性能评价与技术要求

Performance Evaluation and Technical Requirements of Pavement Silicone Sealant

为了评价道路有机硅密封胶的性能，分析了国内外的各种技术标准，根据路用性能要求，提出了表干时间、固化时间、流平性、流值、弹性（复原）率以及低温拉伸这6个评价指标．分别对4种有机硅密封胶（2种进口材料和2种国产材料）进行试验，试验证实这些材料均为自流平材料，表干时间不超过90min，固化时间为2～3周，弹性（复原）率均超过90％，90℃流值均为0mm，-30℃下至少可通过100％拉伸量的3次循环．结果表明：有机硅密封胶是高弹性材料，具有开放交通快、施工方便等优点，且具有优越的高低温性能．另外还根据试验结果提出了相应的技术要求．

In order to evaluate the performance of pavement crack silicone sealant, a variety of domestic and international specifications were analyzed, six evaluation indexes including tack free time, cure time, level- ing, flow value, resilience and bond were proposed according to the requirements of pavement perforn）.- anee. Two imported sealants and two domestic sealants were tested. The results show that all the sealants are leveling materials, and their tack free time are no lo＇nger than 90 minutes, cure time are between 2 and 3 weeks, resilience are more than 90%, flow value are 0 mm at 90 ℃, and all the sealants passed 3 cycles at 100% extension at --30 ℃ in the bond tests. It indicates that silicone sealant is high resilience material with the advantages of open traffic, easy to work, and superior high and low temperature performance. According to the test results, the technical requirements of the evaluation indexes are developed.