Abstract: In?view?of?the?humid?and?rainy?weather?condition?in?South?China,?the?design?of?asphalt?mixtures?is?studied?by?the?orthogonal?experiment?with?the?consideration?of?muhiple?factors,?and?the?factors?that?influence?asphalt?mixtures?performance?such?as?powder-binder?ratio,?aggregate?types,?asphalt?types,?grading?types?and?filler?material?are?considered?synthetically,?at?the?same?time,?freeze-thaw?splitting?residual?strength?ration,?immersion?splitting?residual?strength?ration,?dynamic?stability?and?air?voids?are?also?taken?into?account?as?evaluation?indexes.?Furthermore,?the?range?and?comprehensive?analysis?method?are?applied?to?analyze?the?sensitivity?of?these?influence?factors?and?the?optimized?project?for?materials?composition?of?asphalt?pavement?at?moist?heat?area?is?pointed?out.?The?result?shows?that?powder-binder?ratio?and?the?proportion?of?coarse?aggregate?have?the?main?effect?on?the?asphalt?mixtures?performance,?and?asphalt?mixtures?performance?can?achieve?better?effect?by?means?of?adjusting?the?proportion?of?coarse?aggregate,?selecting?the?appropriate?powder-binder?ratio,?adopting?the?suitable?additives?and?so?on.?The?optimization?program?of?asphalt?mixtures?composition?at?moist?hot?area?is?＇?limestone?＋?modified?asphalt?＋?2%?hydrated?lime?＋?1.3?powder-binder?ratio?＋?60%?coarse?aggregate.

Key words: moist hot area , asphalt mixtures , orthogonal experiment , influence factors , powder-binder ratio ;

摘要： 针对我国南方湿热多雨的气候条件,采用多因素正交试验方法,综合考虑粉胶比、粗集料含量、沥青种类、集 料类型和添加剂等因素,以冻融劈裂强度比、浸水劈裂强度比、动稳定度和空隙率作为评价指标,进行湿热地区沥 青混合料设计研究;并运用极差分析和综合性能分析方法,探讨了湿热地区沥青混合料性能影响因素的敏感性,提 出了湿热地区沥青路面材料组成的优化方案。研究结果表明,粉胶比和粗集料含量对影响湿热地区沥青混合料性 能起主导作用;通过调整沥青混合料内部粗、细集料的比例,选取适当的粉胶比,采用合适的添加剂等措施,可以使 湿热地区混合料的路用性能提高;湿热地区沥青混合料的较好方案为??1??3粉胶比+60%粗集料+改性沥青+石灰 岩+2%消石灰。

关键词: 湿热地区, 沥青混合料, 正交试验, 影响因素, 粉胶比