氨化与磺化改性橡胶混凝土机理及强度研究

doi:10.11896/j.issn.1005-023X.2018.18.008

材料导报

2018, Vol. 32

Issue (18): 3142-3145 https://doi.org/10.11896/j.issn.1005-023X.2018.18.008

无机非金属及其复合材料

氨化与磺化改性橡胶混凝土机理及强度研究

刘誉贵^1,2, 马育¹, 刘攀²

1 重庆交通大学材料科学与工程学院,重庆 400074;
2 重庆市智翔铺道技术工程有限公司,重庆 400076

Study on Mechanism and Strength of Ammoniated Modified Rubber Concrete and Sulfonated Modified Rubber Concrete

LIU Yugui^1,2, MA Yu¹, LIU Pan²

1 School of Materials Science & Engineering, Chongqing Jiaotong University, Chongqing 400074;
2 Chongqing Zhixiang Paving Technology Engineering Co., Ltd., Chongqing 400076

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摘要为改善橡胶混凝土的强度,本工作选用尿素和NaHSO₃两种改性剂对橡胶颗粒进行氨化与磺化改性。借助傅里叶红外光谱仪验证引入的极性亲水基团,利用水接触角试验仪分析改性橡胶的亲水性能,通过粘接强度试验和抗压强度试验研究改性橡胶对橡胶混凝土强度的提升效果,用扫描电子显微镜(SEM)表征橡胶混凝土的微观破坏形貌。结果表明:氨化改性在橡胶颗粒表面引入羰基和氨基等,磺化改性在橡胶颗粒表面引入羟基和磺酸基等;与普通组相比,氨化与磺化改性后,改性橡胶-水接触角分别降低31°、35°,改性橡胶与水泥净浆的粘接强度分别提升44%、53%,改性橡胶混凝土的抗压强度在不同橡胶粒径与掺量条件下均得到提升;SEM结果表明极性亲水基团的引入能较好地提升橡胶颗粒与胶凝材料的粘接性能,有利于改善两者结合界面薄弱的问题,增强橡胶混凝土的整体强度。

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	刘誉贵
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关键词: 氨化改性磺化改性改性机理分析极性亲水基团强度

Abstract: In order to improve the strength performance of rubber concrete, in this paper, urea and NaHSO₃ modifiers were used to modify the rubber granules by ammoniation and sulfonation.The polar hydrophilic group was introduced by FT-IR, the hydrophilic ability of modified rubber was analyzed by water contact angle tester. Through the adhesive strength test and the compressive strength test, the effect of modified rubber on the strength performance of rubberized concrete is studied. SEM was used to cha-racterize the failure microscopic morphology of rubber concrete. The results showed that the carbonyl and amino were introduced on the surface of the rubber particles by sulfonation, and hydroxyl and sulfonic were introduced on the surface of the rubber particles by sulfonation. Compared with normal group, after ammoniation modified and sulfonated modified, modified rubber-water contact angle reduction of 31° and 35° respectively, the adhesion strength between modified rubber and cement paste increased by 44% and 53% respectively, and the compressive strength of modified rubber concrete was improved under the condition of different particle size and content of rubber. SEM showed that the introduction of polar hydrophilic group, can improve the adhesion performance between rubber particles and cementitious materials, beneficial to improve the weak interface between the two, and enhanced the overall strength performance of rubber concrete.

Key words: ammoniation modification sulfonation modification modification mechanism analysis polar hydrophilic group strength

发布日期: 2018-10-18

ZTFLH:

TU528

基金资助: 道路结构与材料交通行业重点实验室(长沙)开放基金(kfj140303)

通讯作者: 马育:女,1953年生,硕士,教授,硕士研究生导师,主要从事路面新材料研究 E-mail:mayu_he@sina.com

作者简介: 刘誉贵:男,1993年生,硕士研究生,主要从事道路材料研究 E-mail:893251497@qq.com

引用本文:

刘誉贵, 马育, 刘攀. 氨化与磺化改性橡胶混凝土机理及强度研究[J]. 材料导报, 2018, 32(18): 3142-3145.
LIU Yugui, MA Yu, LIU Pan. Study on Mechanism and Strength of Ammoniated Modified Rubber Concrete and Sulfonated Modified Rubber Concrete. Materials Reports, 2018, 32(18): 3142-3145.

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http://www.mater-rep.com/CN/10.11896/j.issn.1005-023X.2018.18.008 或 http://www.mater-rep.com/CN/Y2018/V32/I18/3142

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