细集料含量对二灰碎石混合料性能的影响

Impacts on the Fine Aggregate Content to the Property of Lime-fly Ash Bound Macadam

以工程实际常用的二灰和集料比为20∶80的石灰粉煤灰稳定碎石混合料为研究对象,研究分析细集料含量对二灰碎石混合料的无侧限强度、抗压回弹模量和干缩性能的影响规律。结果表明,当2.36mm以下细集料含量在10%左右时,二灰碎石混合料可取得理想的强度性能和良好的抗收缩性能,即二灰材料替代细集料可以得到性能良好的二灰混合料,并可有效提高其抗水侵蚀能力。

This paper studied the lime-fly ash bound macadam mixed with 20∶80 proportions of lime fly-ash and aggregates which is often used in construction projects,analyzed the impacts of the fine aggregate content to the unconfined compressive strength,modulus of compressive resilience and dry shrinkage property with various lime content and is showed that lime-fly ash bound macadam reached the desirable strength property and had good effect on avoiding shrinkage when the fine aggregate of 2.36 mm or under made up about 10% of the material.Therefore,it is concluded that lime-fly ash bound macadam with desirable property,replacing fine aggregates is achievable,and at the same time,resistance to water erosion is improved effectively.