Effect of modifiers on the properties of bamboo scraps/magnesium oxychloride composites under dry-wet cycling environments

IF 6.5 2区 工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY
Shanshan Wu , Qiang Fang , Huagang Zhang , Jiaojiao Yang , Zhengrong Zhou
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Abstract

Bamboo scraps/magnesium oxychloride composites (BS/MOC) is a new low-carbon and eco-friendly building material, which is composed of magnesium oxychloride cement (MOC) as the matrix and bamboo scraps as the reinforcing materials. However, the poor strength and durability of BS/MOC under special environmental conditions seriously restrict its application range. To solve the above problems, citric acid (CA), D-gluconic acid sodium salt (GS), and styrene-acrylate emulsion (SAE) were used as modifiers to improve BS/MOC properties. The effect of modifier addition on the mechanical strength and durability of BS/MOC was investigated under dry-wet cycling environments. The phase composition, microstructure, pore structure, and Clˉ concentration of BS/MOC were characterized by XRD, TGA, SEM, MIP, and ICS-600. The results showed that CA and GS improved the interface adhesion between bamboo scraps and MOC matrix, and both inhibited the hydration reaction of the residual MgO and the hydrolysis of phase 5 crystals, resulting in good mechanical properties and microstructural stability of BS/MOC under dry-wet cycles. GS outperformed CA in refining pore structure, improving mechanical properties and durability of BS/MOC under identical dry-wet cycles. Conversely, the addition of SAE increased initial defects and interfacial transition zones in the BS/MOC matrix, and increased the total porosity and the harmful pores content, which negatively affected the mechanical properties and durability of BS/MOC.

改性剂对干湿循环环境下竹屑/氧氯化镁复合材料性能的影响
竹屑/氧氯化镁复合材料(BS/MOC)是一种新型低碳环保建筑材料,由氧氯化镁水泥(MOC)为基体,竹屑为增强材料组成。然而,BS/MOC 在特殊环境条件下的强度和耐久性较差,严重限制了其应用范围。为解决上述问题,研究人员采用柠檬酸(CA)、D-葡萄糖酸钠(GS)和苯乙烯-丙烯酸酯乳液(SAE)作为改性剂来改善 BS/MOC 的性能。在干湿循环环境下,研究了改性剂的添加对 BS/MOC 机械强度和耐久性的影响。通过 XRD、TGA、SEM、MIP 和 ICS-600 对 BS/MOC 的相组成、微观结构、孔隙结构和 Clˉ 浓度进行了表征。结果表明,CA 和 GS 改善了竹屑与 MOC 基体之间的界面粘附性,并都抑制了残余氧化镁的水化反应和第 5 相晶体的水解,从而使 BS/MOC 在干湿循环条件下具有良好的机械性能和微观结构稳定性。在相同的干湿循环条件下,GS 在细化孔隙结构、改善 BS/MOC 的机械性能和耐久性方面的表现优于 CA。相反,添加 SAE 会增加 BS/MOC 基体中的初始缺陷和界面过渡区,增加总孔隙率和有害孔隙含量,从而对 BS/MOC 的机械性能和耐久性产生负面影响。
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来源期刊
CiteScore
7.60
自引率
19.40%
发文量
842
审稿时长
63 days
期刊介绍: Case Studies in Construction Materials provides a forum for the rapid publication of short, structured Case Studies on construction materials. In addition, the journal also publishes related Short Communications, Full length research article and Comprehensive review papers (by invitation). The journal will provide an essential compendium of case studies for practicing engineers, designers, researchers and other practitioners who are interested in all aspects construction materials. The journal will publish new and novel case studies, but will also provide a forum for the publication of high quality descriptions of classic construction material problems and solutions.
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