发泡剂对沥青发泡和混合料水稳定性的影响

Effect of Foaming Agent on Asphalt Foaming and Water Stability of Mixture

摘要:

提出了掺发泡剂泡沫沥青的微观结构模型,分析了发泡剂在沥青发泡过程中的作用原理.从改善沥青发泡与提高冷再生泡沫沥青混合料的水稳定性角度出发,选择了3种发泡剂(A,B,C),并分别进行了沥青发泡试验和混合料劈裂强度试验.结果表明:A发泡剂(Redicote C-450)对泡沫沥青膨胀率的影响较小,对泡沫沥青半衰期基本无影响;B发泡剂(十六烷基三甲基溴化铵)对泡沫沥青膨胀率和半衰期影响都较大;C发泡剂(仕博阳离子中裂型乳化剂)对泡沫沥青膨胀率基本无影响,但使泡沫沥青半衰期提高了1倍;A,B,C发泡剂均可大大增强混合料的水稳定性;使用先进冷再生设备时,发泡剂的选择应着重考虑其抗剥落性能.

Abstract:

Micro structural model of foamed asphalt with foaming agent was proposed to analyze the mechanism of foaming agent in asphalt foaming.For improving asphalt foaming and increasing the cold recycling foamed asphalt mixture water stability,3 types of foaming agent(A,B,C) were chosen for asphalt foaming and mixture indirect tensile strength test.Results indicate that foaming agent A(Redicote C-450) has relatively small influence on expansion ratio,and little influence on half life;foaming agent B(cetyl trimethy...