采用天然砾石骨料的浇筑式沥青混凝土配合比设计及性能研究

在进行沥青混凝土配合比设计时,为保证骨料与沥青的粘附性及心墙的安全可靠性,沥青混凝土骨料多采用碱性岩石破碎的人工碎石,当采用天然砾石骨料配置沥青混凝土时,材料的配合比及水稳定性越来越受到工程界的关注。本文采用广泛分布于新疆的天然砂砾料作为原材料,进行沥青混凝土配合比设计。提出当丁朴荣公式中沥青含量为8.3%～8.6%、填料用量为10%～14%、级配指数0.33或0.34时,采用天然砂砾料配置的沥青混凝土仍具有良好的流动性能,同时也符合沥青混凝土的水稳定性要求。

Study on mix proportion design and performance of casting asphalt concrete composed of natural gravel aggregate

In the mix proportion design of casting asphalt concrete,alkaline and broken artificial stone of the aggregate of asphalt concrete is taken to guarantee adhesion between aggregate and asphalt as well as reliability of the core.when natural gravel aggregate is applied in configurating asphalt concrete,mix proportion of material and water stability attract more and more attention in engineering field.This paper used natural gravel which is widely distributed in Xinjiang to carry out.It indicates when asphalt content is 8.3% to 8.6%,mineral filler content is 0% to 14% and grading index is 0.33 or 0.34 in Ding Purong formula,asphalt concrete using natural gravel aggregate configuration has good fluidity and also accords with the requirement of water stability for asphalt concrete.