PROPERTIES OF CEMENT-BASED MATERIALS COATED WITH SHRINKAGE REDUCING AGENTS

机译：减缩剂包覆的水泥基材料的性能

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Shrinkage reducing agents (SRA) have been used in cement-based materials to combat shrinkage for several years. Comparing with mixing with SRA, which may cause a negative effect on strength development of materials, coating with SRA is deserved to be studied as a useful approach. This study investigates shrinkage, cracking resistance, mechanical properties and microstructure of cement-based materials coated with SRA. The results indicated that the higher the concentration of SRA was coated, the larger the shrinkage reduction ratio was obtained. The optimal concentration is 50%, moreover, different methods of coating has no influence on shrinkage reducing effect. Furthermore, cracking resistance of mortar was improved and cracking area was reduced by 35%, both of flexural and compressive strengths of mortar were increased after being coated with SRA. The results also indicated that more C-S-H gel and ettringite were formed in cement pastes coated with SRA, compared with the control sample.

机译：减缩剂（SRA）已用于水泥基材料中，以对抗收缩已有数年的历史了。与与SRA混合可能会对材料的强度发展产生负面影响相比，SRA涂层作为一种有用的方法值得研究。本研究调查了涂覆有SRA的水泥基材料的收缩率，抗裂性，力学性能和微观结构。结果表明，涂覆的SRA浓度越高，收缩率的降低率越大。最佳浓度为50％，此外，不同的涂布方法对减缩效果没有影响。进一步地，砂浆经抗拉强度提高，砂浆抗裂性提高，裂缝面积减少了35％，砂浆的抗折强度和抗压强度均有所提高。结果还表明，与对照样品相比，在涂有SRA的水泥浆中形成了更多的C-S-H凝胶和钙矾石。

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《第二届自密实混凝土设计、性能及应用技术国际研讨会(2nd International Symposium on Design,Performance and Use of Self-Consolidating Concrete SCC'2009-China)》|2009年|596-605|共10页
会议地点 Beijing(CN)
作者
Zhi Wang; Dun Qiao; Jueshi Qian; Liang Shi; Caijun Shi;
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作者单位

College of Chemistry and Chemical Engineering, Chongqing University, China;

College of Material Science and Engineering, Chongqing University, China,Chongqing Bureau of Highway Administration, China;

College of Material Science and Engineering, Chongqing University, China;

College of Material Science and Engineering, Chongqing University, China;

College of Civil Engineering, Hunan University,China;

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PROPERTIES OF CEMENT-BASED MATERIALS COATED WITH SHRINKAGE REDUCING AGENTS

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