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早强型高延性水泥基复合材料的性能研究
Study on Performance of Early Strength High Ductility Cementitious Composite Materials
2019年第6期
高延性水泥基复合材料;韧性;收缩;冻融
High ductility cementitious composites; Toughness; Shrinkage;Freeze-thaw
2019年第6期
10.19761/j.1000-4637.2019.06.009.05
十三五重点研发计划(2016YFB0303200);国家自然科学青年基金(51508244);六大人才高峰项目(XCL-080);高性能土木工程国家实验室重点基金(2013CEM001)。
阳知乾1,2,胡浩3,4,刘建忠1,2,蒋金洋3,4,沙建芳1,2,郭飞1,2,徐海源1,2,韩方玉1,2
1.江苏苏博特新材料股份有限公司,南京 211100;2.南京(苏博特)高性能工程纤维工程 技术研究中心,210008;3.东南大学材料科学与工程学院,南京 211189; 4.江苏省土木工程材料重点实验室,南京211189

阳知乾1,2,胡浩3,4,刘建忠1,2,蒋金洋3,4,沙建芳1,2,郭飞1,2,徐海源1,2,韩方玉1,2

阳知乾,胡浩,刘建忠,等.早强型高延性水泥基复合材料的性能研究[J].混凝土与水泥制品,2019(6):9-13.

YANG Z Q,HU H,LIU J Z,et al.Study on Performance of Early Strength High Ductility Cementitious Composite Materials[J].China Concrete and Cement Products,2019(6):9-13.

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为了满足结构工程对修复材料提出的施工方式与开放时间、增韧、体积变形及抗冻融的实际需求,研究了高延性水泥基复合材料(HDCC)的凝结时间、拉伸-位移、劈裂抗拉、收缩及冻融性能的影响。结果表明,在保证早期强度发展的前提下,缓凝剂有效地延长了凝结时间从而保证其相应的施工时间,纤维的合理使用可提高HDCC的拉伸韧性与劈裂抗拉强度,而减缩剂与膨胀剂可将HDCC的收缩应变减小至200 με以内,同时,新型HDCC还表现出良好的抗冻融特性。 Abstract: In order to meet the practical requirements of construction methods and time, toughening, volume deformation and freeze-thaw resistance of repairing materials, the effects of setting time, tension-displacement, splitting tension, shrinkage and freeze-thaw resistance of high ductility cement-based composites (HDCC) were studied in this paper. The results show that, on the premise of guaranteeing the early strength development, the retarder effectively prolongs the setting time and guarantees the construction time. The reasonable use of fibers can improve the tensile toughness and splitting tensile strength of HDCC, while the shrinkage strain of HDCC can be reduced to less than 200 με by applying shrinkage reducing agent and expansion agent. At the same time, the new HDCC also shows good freeze-thaw resistance.
英文名 : Study on Performance of Early Strength High Ductility Cementitious Composite Materials
刊期 : 2019年第6期
关键词 : 高延性水泥基复合材料;韧性;收缩;冻融
Key words : High ductility cementitious composites; Toughness; Shrinkage;Freeze-thaw
刊期 : 2019年第6期
DOI : 10.19761/j.1000-4637.2019.06.009.05
文章编号 :
基金项目 : 十三五重点研发计划(2016YFB0303200);国家自然科学青年基金(51508244);六大人才高峰项目(XCL-080);高性能土木工程国家实验室重点基金(2013CEM001)。
作者 : 阳知乾1,2,胡浩3,4,刘建忠1,2,蒋金洋3,4,沙建芳1,2,郭飞1,2,徐海源1,2,韩方玉1,2
单位 : 1.江苏苏博特新材料股份有限公司,南京 211100;2.南京(苏博特)高性能工程纤维工程 技术研究中心,210008;3.东南大学材料科学与工程学院,南京 211189; 4.江苏省土木工程材料重点实验室,南京211189

阳知乾1,2,胡浩3,4,刘建忠1,2,蒋金洋3,4,沙建芳1,2,郭飞1,2,徐海源1,2,韩方玉1,2

阳知乾,胡浩,刘建忠,等.早强型高延性水泥基复合材料的性能研究[J].混凝土与水泥制品,2019(6):9-13.

YANG Z Q,HU H,LIU J Z,et al.Study on Performance of Early Strength High Ductility Cementitious Composite Materials[J].China Concrete and Cement Products,2019(6):9-13.

摘要
参数
结论
参考文献
引用本文

摘   要:为了满足结构工程对修复材料提出的施工方式与开放时间、增韧、体积变形及抗冻融的实际需求,研究了高延性水泥基复合材料(HDCC)的凝结时间、拉伸-位移、劈裂抗拉、收缩及冻融性能的影响。结果表明,在保证早期强度发展的前提下,缓凝剂有效地延长了凝结时间从而保证其相应的施工时间,纤维的合理使用可提高HDCC的拉伸韧性与劈裂抗拉强度,而减缩剂与膨胀剂可将HDCC的收缩应变减小至200 με以内,同时,新型HDCC还表现出良好的抗冻融特性。

Abstract: In order to meet the practical requirements of construction methods and time, toughening, volume deformation and freeze-thaw resistance of repairing materials, the effects of setting time, tension-displacement, splitting tension, shrinkage and freeze-thaw resistance of high ductility cement-based composites (HDCC) were studied in this paper. The results show that, on the premise of guaranteeing the early strength development, the retarder effectively prolongs the setting time and guarantees the construction time. The reasonable use of fibers can improve the tensile toughness and splitting tensile strength of HDCC, while the shrinkage strain of HDCC can be reduced to less than 200 με by applying shrinkage reducing agent and expansion agent. At the same time, the new HDCC also shows good freeze-thaw resistance.

关键词:
高延性水泥基复合材料;韧性;收缩;冻融
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采用硫铝酸盐水泥制备了HDCC,其凝结时间随着缓凝剂的增加而相应延长,初凝时间基本超过60 min,进而可满足涂抹施工时间或喷射施工要求;纤维是实现HDCC材料应变硬化的最关键村料,纤维掺量为1.25%、1.50%及1.75%时极限应变平均值为0.72%、1.71%、2.22%,但掺量为1.25%时未出现多缝开裂;考虑工程中对于HDCC的流变性能与成本要求,较合适的PVA纤维体积掺量为1.50%;劈裂抗拉结果表明,相当强度等级的HDCC具有比普通混凝土更好的劈拉韧性。通过单掺减缩剂或减缩剂与膨胀剂混掺应用,均能较好地抑制HDCC材料的收缩,其60 d的收缩应变低于190 με;此外,HDCC的冻融循环达到300次才出现破坏,表明其优良的抗冻融性能。HDCC优异的综合性能可广泛应用于结构修复工程。

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阳知乾,胡浩,刘建忠,.早强型高延性水泥基复合材料的性能研究[J].混凝土与水泥制品,2019(6):9-13.

YANG Z Q,HU H,LIU J Z,et al.Study on Performance of Early Strength High Ductility Cementitious Composite Materials[J].China Concrete and Cement Products,2019(6):9-13.

 

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