旧半刚性基层材料性能的试验研究

分析旧半刚性基层材料性能对于再生利用具有一定的指导作用。选取4个不同工程施工现场提取的旧半刚性基层材料对其原材料各项性能及其水稳再生后的强度进行系统的试验分析,并与天然碎石和规范标准进行比较,评价其再生可能性及适用性。结果表明:旧半刚性基层材料经铣刨后,集料表面有砂浆裹附且产生了新的断面,这有助于再生材料强度的增强。集料级配满足传统悬浮密实型级配范围的要求。集料中残留的活性已基本丧失,再生骨料仍具有一定强度,集料吸水性较好。旧半钢性基层材料水稳再生后的强度满足规范中各等级公路底基层的强度要求。

Experiment on performance of old semi-rigid base materials

Analysis of performance of old semi-rigid base material has a certain guiding role for the old semi-rigid material recycling. The paper selected old semi-rigid base material extracted from four different construction sites to make a systematic analysis of raw material performances and the strength of recycled materials through test, and compared that with the natural gravel and normative standards to evaluate the possibility and applicability of its recycling. Result shows that the old semi-rigid material after milling,its surface wrapped with mortar created new section which helps to enhance the strength of recycled materials. The aggregate gradation meets the requirements of traditional suspension dense gradation range. The residual activity of aggregate has been basically lost,but recycled aggregates still has certain strength and is absorbent. The strength of recycled materials meets the strength requirements of each grade highway subbase in specification.