不同加速养生方式泡沫沥青冷再生混合料宏细观结构性能研究

硅酸盐通报 ›› 2021, Vol. 40 ›› Issue (1): 330-339.

所属专题：道路材料

不同加速养生方式泡沫沥青冷再生混合料宏细观结构性能研究

王雨楠¹, 吕卫帮²

1.吉林交通职业技术学院道桥工程学院,长春 130012;
2.中国科学院苏州纳米技术与纳米仿生研究所先进纳米复合材料创新中心,苏州 215123

收稿日期:2020-01-04 修回日期:2020-03-03 出版日期:2021-01-15 发布日期:2021-02-07
作者简介:王雨楠(1981—),女,副教授。主要从事建筑材料及结构性能方面的研究。E-mail:wsnmr999@163.com

Macro-Meso Structure Performance of Foamed Asphalt Cold RecycledMixture with Different Curing Methods

WANG Yunan¹, LYU Weibang²

1. College of Road and Bridge Engineering,Jilin Communications Polytechnic,Changchun 130012,China;
2. Innovation Center for AdvancedNanocomposites (ICAN),Suzhou Institute of Nano-Tech and Nano-Bionics (SINANO),Chinese Academy of Sciences,Suzhou 215123,China

Received:2020-01-04 Revised:2020-03-03 Online:2021-01-15 Published:2021-02-07

摘要/Abstract

摘要： 为了使泡沫沥青冷再生混合料室内加速养生方式能更加真实地模拟现场实际养生条件,基于含水率试验、力学性能及疲劳试验研究了5种养生方式的泡沫沥青冷再生含水率、劈裂强度(ITS)、贯入剪切强度(S_D)、无侧限抗压强度(UCS)的影响规律,对比了不同养生方式泡沫沥青冷再生混合料早期强度、中长期力学强度、疲劳性能的差异;进而以X-Ray CT为平台,研究了不同养生方式泡沫沥青冷再生混合料微细观三维空隙结构的分布特征。结果表明,5种养生方式的泡沫沥青冷再生中长期力学强度与疲劳寿命排序为:开放养生＞马歇尔模内养生＞半封闭养生＞组合养生＞封闭养生,不同养生方式泡沫沥青冷再生混合料的微细观空隙结构有明显差异,不同养生方式下泡沫沥青冷再生混合料微细观空隙级配、平均空隙直径、最可几空隙直径与力学性能、疲劳寿命之间的拟合良好。推荐40 ℃半封闭养生36 h来模拟加铺上覆层前现场早期(7~14 d)养生条件,采用40 ℃半封闭36 h+全封闭养生72 h“组合”养生方案作为泡沫沥青冷再生混合料的中长期室内加速养生方案。

关键词: 道路工程, 泡沫沥青冷再生混合料, 养生方式, 力学强度, 疲劳性能

Abstract: In order to make the indoor accelerated curing method of foamed asphalt cold recycled mixture more realistically simulate the actual curing conditions in the field,based on the moisture content test,mechanical properties and fatigue test,the moisture content,splitting strength,penetrating shear strength and unconfined compressive strength of the foamed asphalt cold recycled mixtures with 5 curing methods were studied.And the differences in the early strength,medium and long-term mechanical strength,and fatigue performance of foamed asphalt cold recycled mixtures with different curing methods were compared.Then X-Ray CT was used as platform to study the distribution characteristics of the fine and microscopic three-dimensional void structure of foamed asphalt cold recycled mixtures with different curing methods.The test results show that the long-term mechanical strength and fatigue life of the five types of foamed asphalt cold recycled mixtures are ranked as follows:open curing >Marshall in-mold curing >semi-closed curing >combined curing >closed curing.There are obvious differences in the fine and microscopic void structure.The fine-micro void gradation,average void diameter,maximum void diameter,mechanical properties,and fatigue life of the foamed asphalt cold recycled mixtures are well fitted under different curing methods.The semi-closed curing condition at 40 ℃+36 h is recommended to simulate the early (from 7 d to 14 d) on-site curing conditions before the overlay is overlaid.The 40 ℃ semi-closed curing for 36 h+the fully closed curing for 72 h is used as the medium and long-term accelerated indoor curing method for foamed asphalt cold recycled mixture.

Key words: road engineering, foamed asphalt cold recycled mixture, curing method, mechanical strength, fatigue performance

中图分类号:

U414.1

王雨楠, 吕卫帮. 不同加速养生方式泡沫沥青冷再生混合料宏细观结构性能研究[J]. 硅酸盐通报, 2021, 40(1): 330-339.

WANG Yunan, LYU Weibang. Macro-Meso Structure Performance of Foamed Asphalt Cold RecycledMixture with Different Curing Methods[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(1): 330-339.

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不同加速养生方式泡沫沥青冷再生混合料宏细观结构性能研究

Macro-Meso Structure Performance of Foamed Asphalt Cold RecycledMixture with Different Curing Methods

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