High Temperature Performance Evaluation and Grading of Warm-mixed Flame Retardant Asphalt Based on MSCR Test

被引：0
|
作者：
Liu S. [1 ]
Lin Y. [1 ]
Li M. [2 ]
Zhou S. [3 ]
机构：
[1] College of Civil and Transportation Engineering, Hohai University, Nanjing
[2] China Design Group, Nanjing
[3] Guangxi Jiaotou Technology Co.,Ltd., Nanning
来源：
Cailiao Daobao/Materials Reports | 2023年 / 37卷 / 09期
基金：
中国国家自然科学基金; 中国博士后科学基金;
关键词：
flame retardant; multiple stress creep recovery(MSCR)test; performance grade; SBS modified asphalt; warm mix agent;
D O I：
10.11896/cldb.21060064
中图分类号：
学科分类号：
摘要：
In order to study the high temperature performance of warm-mixed flame retardant asphalt,the warm agents(Sasobit),aluminum hydroxide (ATH)and organic montmorillonite(OMMT)were added respectively into 70#petroleum asphalt and SBS modified asphalt to prepare warm-mixed flame retardant asphalt with three kinds of different use levels (by mass). The high temperature performance of warm-mixed flame retardant asphalt was evaluated by multi-stress creep recovery (MSCR)test at 60 ℃. Then,strain variation percent recovery (R),non-recoverable creep compliance (Jnr)and their stress sensitivity index (Rdiff,Jnrdiff)derived from this test were analyzed. According to AASHTO M 332-20 specification,traffic grading was conducted on modified asphalt with different use levels of flame retardant. The results show that for the two types of asphalt,with the increase of use level of flame retardant,the strain decreases,the non-recoverable creep compliance shows downward trend and percent recovery shows upward trend,especially for flame retardant at lower content,which indicates that the increasing use level of flame retardant is more prominent for the improvement of high temperature performance of asphalt at lower flame retardant content. The Jnr3. 2 value of warm mix flame retardant bitumen (road petroleum bitumen)does not meet the requirement of ‘≤ 4. 5’in the AASHTO standard. The Jnrdiff values of warm mix flame retardant asphalt can meet the requirement of ‘≤75%’in the AASHTO standard. Warm-mixed flame retardant asphalt (road petroleum asphalt)does not meet the requirements of standard traffic and thus can not be graded,warm-mixed flame retardant asphalt (SBS modified asphalt)reaches the standard of Very Heavy Traffic ‘V’Grade at 4% flame retardant content,and Extremely Heavy Traffic ‘E’ Grade at 8% and 12% content,so warm mixed flame retardant asphalt (SBS modified asphalt)has better high temperature performance. Through comprehensive evaluation of various creep mechanical properties indicators,high temperature performance grade and traffic classification and economy,the optimal dosage of compound flame retardant is recommended to be 8%. © 2023 Cailiao Daobaoshe/ Materials Review. All rights reserved.
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