二灰碎石快速养生技术研究

Study on Rapid Curing Technology of Lime-fly Ash Stabilized Macadam

以高温养生、标准养生为手段,通过配合比试验、抗压回弹模量试验、劈裂强度试验,对二灰碎石的力学性能进行了系统研究.通过对试验数据进行回归分析,得到高温养生与标准养生条件下材料的强度增长规律关系,从而由短龄期的高温养生强度确定标准养生下180 d龄期的强度.并利用电镜扫描技术,对高温养生和标准养生条件下试样的微结构进行观测对比分析.研究表明,高温养生可改善二灰碎石的微结构,显著提高其早期强度,缩短稳定材料的养生龄期,快速确定二灰碎石的设计参数和施工配合比设计主要控制指标.

By the method of high temperature curing and standard curing,mechanical properties of lime-fly ash stabilized macadam were researched systematically through mix ratio test,compression rebound modulus test and cleavage strength test.First,relationship of strength growing laws for lime-fly ash stabilized macadam under conditions of high temperature curing and standard curing was obtained by regression analysis of the test results.Then,the strength of lime-fly ash stabilized macadam cured by standard temperature for 180 d was determined from the test result which cured by high-temperature for short age through the relationship.Comparative analysis of microstructure of lime-fly ash stabilized macadam cured by high temperature and standard temperature was carried out by electron microscope scanning.The results show that,by high temperature curing,microstructure of lime-fly ash stabilized soil can be ameliorated,early strength can be increased evidently,and curing age can be shortened.Design parameters and major control indexes of ratio design for construction of lime-fly ash stabilized macadam can be confirmed rapidly.