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

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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

Published: 18 October 2018

CLC number:

TU528

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	LIU Yugui
	MA Yu
	LIU Pan

Cite this article:

LIU Yugui,MA Yu,LIU Pan. Study on Mechanism and Strength of Ammoniated Modified Rubber Concrete and Sulfonated Modified Rubber Concrete[J]. Materials Reports, 2018, 32(18): 3142-3145.

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

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