半刚性基层不同龄期弯沉检验标准

半刚性基层材料的强度与模量随龄期增长,基层弯沉值也随着龄期变化。为得到半刚性基层不同龄期的弯沉检测标准,在室内成型二灰土和二灰碎石试件,并在标准条件下养生;采用顶面法测定试件不同龄期的抗压回弹模量,得出其模量随龄期增长的规律,将其代入弹性层状体系理论简化公式中,得出不同龄期半刚性基层顶面弯沉值计算公式,并给出其实例应用的说明。结果表明,采用该弯沉公式并结合路面实测数据计算出的弯沉值,作为相应龄期半刚性基层的施工弯沉检验标准值,能充分反映半刚性基层弯沉值随龄期的变化规律,更好地评价路面施工质量。

Deflection checking standard of semi-rigid base in different ages

The strength and modulus of semi-rigid base material increase with age,so the reflection of base varies with age too.In order to get the deflection test standard for semi-rigid base at different ages,indoor test pieces of lime-flyash stabilized soil and lime-flyash stabilized crushed stone were formed and cured at the standard condition.The compression rebound modulus at different ages were tested with top surface measuring method,and the modulus development law with age was drawn.The top deflection calculation formula of semi-rigid base at different ages was got by substitution of the development law into the simplified formula of elastic layered system theory,and the application was explained with experiment road.The results show that taking the deflection calculated by the formula and pavement test data as construction deflection test standard of semi-rigid base at corresponding age can fully consider the deflection variety law of semi-rigid base with age,so as to evaluate the pavement construction quality better.2 tabs,2 figs,9 refs.