|Table of Contents|

Bending-tension performance and axial tension constitutive model of ultra-high performance concrete under normal temperature curing(PDF)

《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

Issue:
2024年03期
Page:
43-53
Research Field:
建筑材料
Publishing date:

Info

Title:
Bending-tension performance and axial tension constitutive model of ultra-high performance concrete under normal temperature curing
Author(s):
LIANG Lin2;  WANG Qiuwei1; 2; 3;  SHI Qingxuan1; 2; 3;  HAN Wenchao1;  YU Jing1
(1. College of Civil Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, Shaanxi, China; 2. State Key Laboratory of Green Building, Xi'an University of Architecture and Technology, Xi'an 710055, Shaanxi, China; 3. Key Lab of Structural Engineering and Earthquake Resistance, Ministry of Education, Xi'an University of Architecture and Technology, Xi'an 710055, Shaanxi, China)
Keywords:
ultra-high performance concrete;  normal temperature curing;  bending-tension performance;  backward analysis method;  axial tension constitutive model
PACS:
TU528
DOI:
10.19815/j.jace.2022.05034
Abstract:
The basic mix proportion of ultra-high performance concrete(UHPC)under normal temperature curing was determined based on the hydration reaction equation and the compact packing theory. Eight groups of UHPC flexural specimens were designed considering the water-binder ratio and steel fiber content based on the proportion.The bending failure mode, load-deflection curve, bending-tension characteristic parameters, and bending toughness of the specimens were analyzed by four-point bending tests. Based on the test results, the UHPC axial tension stress-strain curve was obtained by using the backward analysis method. The axial tension constitutive model considering fiber characteristics was proposed using regression analysis and validated at both material and component levels. The results show that the addition of steel fibers can suppress the development of main cracks, thereby significantly improve the bending toughness of UHPC. The bending toughness index of UHPC with 2.0% steel fiber content reaches 116.9 J. As the water cement ratio increases, the flexural strength and peak deflection of the specimen both show a decreasing trend. Increasing the steel fiber content can significantly improve the bending performance of the specimens. Compared with the specimens untreated by fibers, the initial crack deflection and flexural strength of UHPC with 2.0% steel fibers increased by 157.14% and 148.63% respectively. When the fiber content is between 1.5% and 2.0%, the specimen exhibits good flexural and tensile properties. The water cement ratio has little effect on the trend of the platform section of the curve. When the fiber content is greater than 1.0%, the curve has obvious strain hardening characteristics, which can ensure the good tensile performance of UHPC. The strain hardening characteristics become more obvious with the increase of fiber content. The proposed model has good predictive ability for the tensile stress-strain relationship of UHPC.

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Last Update: 2024-05-20