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Title:: Design of Ca(OH)2incorporated zeolite and its inhibition effect on bitumen VOCs

Author(s):: XIAO Yue1; CHANG Xiwen1; ZHANG Xiaoshan1; LONG Yongshuang1;  CUI Peiqiang2; ZHOU Hougui3; State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan 430070,〖JP〗 Hubei, China; 2. Gezhouba Wuhan Road Materials Co., Ltd., Wuhan 430030, Hubei, China; 3. China Energy Design Group Co., Ltd., Beijing 100022, China)

Keywords:: road engineering; bitumen VOCs; Ca(OH)2incorporated zeolite; pyrolysisgas chromatographymass spectrometer; inhibition effect

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DOI:: -

Abstract:: Amid to continuous volatile organic compounds(VOCs) emissions during heating, agitation, paving, and service have resulted in nonnegligible environmental pollution and health threats to construction workers, the inhibition effect of asphalt VOCs was conducted. Through the investigation and summary of the research methods of the asphalt VOCs inhibition, it was clear that the method of controlling asphalt VOCs from the source was the most feasible and effective. Therefore, a zeolite material with excellent pore structure was established as an inhibitor of asphalt VOCs. Based on the adsorption mechanism of the VOCs and the principle that the incorporation of calcium hydroxide in hydrothermal synthesis can accelerate the growth of zeolite crystals and roughen their surface, Ca(OH)2incorporated zeolitebased asphalt VOCs inhibitors with porous adsorption and internal crystal water volatilization to reduce the mixing temperature were designed and synthesized. The optimal ratio of aluminum to calcium was determined from three aspects, surface morphology, thermosgravimetric stability, and optimal mixing temperature of the asphalt using SEM and TG tests. Given the difficulty of collecting asphalt VOCs and the quantitative analysis of Chinas asphalt VOCs remains in an exploration stage, a fullclosed system pyrolysisgas chromatographymass spectrometer was used to reduce the errors caused by environmental factors during the process of collecting asphalt VOCs. Pyrolysis temperature and pyrolysis time analysis were conducted to assess the inhibitory effect of calcium hydroxide zeolite on asphalt VOCs. The results show that the Ca(OH)2incorporated zeolite with an aluminumtocalcium ratio of 1∶2 has the best inhibitory effect on asphalt VOCs. 〖JP2〗The comprehensive inhibitory efficiency of the calcium hydroxide zeolite on asphalt VOCs can reach 37.18%. At the same time, because of the combination of the adsorption characteristics and catalytic properties of the Ca(OH)2incorporated zeolite, the inhibitory efficiency of the asphalt VOCs is different under different temperatures and pyrolysis times.

Design of Ca(OH)2incorporated zeolite and its inhibition effect on bitumen VOCs(PDF)

长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]

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