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[1] Chai Lijuan, Guo Liping, , et al. Effects of curing age on compressive and tensile stress-strainbehaviors of ecological high ductility cementitious composites [J]. Journal of Southeast University (English Edition), 2020, 36 (1): 73-80. [doi:10.3969/j.issn.1003-7985.2020.01.010]
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Effects of curing age on compressive and tensile stress-strainbehaviors of ecological high ductility cementitious composites()
养护龄期对生态高延性水泥基复合材料抗压 和抗拉应力-应变关系的影响
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Journal of Southeast University (English Edition)[ISSN:1003-7985/CN:32-1325/N]

Volumn:
36
Issue:
2020 1
Page:
73-80
Research Field:
Materials Sciences and Engineering
Publishing date:
2020-03-20

Info

Title:
Effects of curing age on compressive and tensile stress-strainbehaviors of ecological high ductility cementitious composites
养护龄期对生态高延性水泥基复合材料抗压 和抗拉应力-应变关系的影响
Author(s):
Chai Lijuan1, Guo Liping1, 2, 3, Chen Bo4, Cao Yuanzhang1
1 School of Materials Science and Engineering, Southeast University, Nanjing 211189, China
2 Jiangsu Key Laboratory of Construction Materials, Southeast University, Nanjing 211189, China
3 Collaborative Innovation Center for Advanced Civil Engineering Materials, Southeast University, Nanjing 211189, China
4 State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Nanjing Hydraulic Research Institute, Nanjing 210029, China
柴丽娟1, 郭丽萍1, 2, 3, 陈波4, 曹园章1
1东南大学材料科学与工程学院, 南京 211189; 2东南大学江苏省土木工程材料重点实验室, 南京 211189; 3东南大学江苏省先进土木工程材料协同创新中心, 南京 211189; 4南京水利科学研究院水文水资源与水利工程科学国家重点实验室, 南京 210029
Keywords:
ecological high ductility cementitious composites(Eco-HDCC);  compressive stress-strain behavior;  tensile stress-strain behavior;  curing age;  reaction degree;  non-evaporable water content;  pH value in pore solution
生态高延性水泥基复合材料(Eco-HDCC);  抗压应力-应变关系;  抗拉应力-应变关系;  养护龄期;  反应程度;  非蒸发水含量;  孔溶液pH值
PACS:
TU528
DOI:
10.3969/j.issn.1003-7985.2020.01.010
Abstract:
To obtain the design parameters of the structure made by ecological high ductility cementitious composites(Eco-HDCC), the effects of curing age on the compressive and tensile stress-strain relationships were studied. The reaction degree of fly ash, non-evaporable water content and the pH value in pore solution were calculated to reveal the mechanical property. The results indicate that as the curing age increases, the peak compressive strength, peak compressive strain and ultimate tensile strength of Eco-HDCC increase. However, the ultimate compressive strain and ultimate tensile strain of Eco-HDCC decrease with the increase in curing age. Besides, as the curing age increases, the reaction degree of fly ash and non-evaporable water content in Eco-HDCC increase, while the pH value in the pore solution of Eco-HDCC decreases. Finally, the simplified compressive and tensile stress-strain constitutive relationship models of Eco-HDCC with a curing age of 28 d were suggested for the structure design safety.
为了获得生态高延性水泥基复合材料(Eco-HDCC)在结构设计中所需要的参数, 研究了养护龄期对Eco-HDCC抗压和抗拉应力-应变关系的影响, 并计算粉煤灰反应程度、非蒸发水含量和孔溶液pH值以揭示力学性能.结果表明:随着养护龄期的增加, Eco-HDCC的抗压强度、峰值压应变和极限抗拉强度均呈增加趋势, 而龄期对Eco-HDCC极限压应变和极限拉伸应变有负面影响;随着龄期的增加, 粉煤灰反应程度和非蒸发水含量逐渐增加, 而孔溶液的pH值却呈降低趋势.考虑结构设计的安全性, 建议使用养护28 d后Eco-HDCC简化的抗压和抗拉应力-应变关系.

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Memo

Memo:
Biographies: Chai Lijuan(1991—), female, Ph. D. candidate; Guo Liping(corresponding author), female, doctor, associate professor, guoliping691@163.com.
Foundation items: The National Natural Science Foundations of China(No. 51778133), the Transportation Science & Technology Project of Fujian Province(No.2017Y057), the China Railway Project(No.2017G007-C), Foundation of the China Scholarship Council(No.201906090163).
Citation: Chai Lijuan, Guo Liping, Chen Bo, et al. Effects of curing age on compressive and tensile stress-strain behaviors of ecological high ductility cementitious composites.[J].Journal of Southeast University(English Edition), 2020, 36(1):73-80.DOI:10.3969/j.issn.1003-7985.2020.01.010.
Last Update: 2020-03-20