|Table of Contents|

Effect of curing method and early age on interfacialbond properties of steel fiber-UHPC matrix(PDF)

长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]

Issue:
2022年6期
Page:
133-142
Research Field:
桥梁工程·交通基础设施智能化运维技术专栏
Publishing date:

Info

Title:
Effect of curing method and early age on interfacialbond properties of steel fiber-UHPC matrix
Author(s):
YUAN Sheng;  YAN Dong-huang;  YUAN Ming;  WU Xiao-juan;  HUANG Lian
(School of Civil Engineering, Changsha University of Science & Technology, Changsha 410114, Hunan, China)
Keywords:
bridge engineering;  ultra-high performance concrete;  steel fiber;  bonding performance;  curing method;  early age
PACS:
U446
DOI:
10.19721/j.cnki.1671-8879.2022.06.013
Abstract:
In order to further understand the influence of curing method and time on the bonding properties of steel fiber-ultrahigh performance concrete(UHPC)matrix interface, the micro mechanism of curing methods and time affecting the bonding properties of steel fiber-UHPC matrix was clarified.UHPC matrix strength tests(compressive and flexural)and single fiber pullout tests under different curing methods and time were carried out. The curing methods(standard curing, 90 ℃ hot water curing, 95 ℃±5 ℃ steam curing)and curing time(1, 3, 7 d)were taken as variables. A total of nine groups of specimens were prepared for strength tests and single fiber pullout tests. Based on the matrix strength, pullout parameters and load-slip curves of the pullout specimens, the surface morphology of the fiber and the microscopic morphology characteristics of the matrix tunnel after fiber pullout, the effects of curing methods and early age on mechanical properties of UHPC matrix and interfacial bonding properties of steel fiber-UHPC matrix were analyzed comprehensively.The results show that the curing conditions of high temperature and high humidity promote the hydration reaction of the cementing material, and improve the structure compactness of UHPC matrix, which is the main influencing factor for the mechanical properties of UHPC matrix to be greatly improved in a short term. At the same curing age, heat water curing and steam curing method have the most significant effect on the mechanical properties of UHPC, and the standard curing method is poor. Under the same curing mode, with the increase of age, the stronger the matrix strength is, the ultimate pullout load, pullout work and bond strength of specimens are enhanced. It can be seen that the matrix strength is the guarantee of good bond between steel fiber and UHPC matrix. In the early stage of curing, the strength of steam curing and water bath curing is improved quickly, and the standard curing is improved quickly in the later stage. In the 3 d steam curing, the design strength required by the UHPC specification can be reached. Therefore, for the maintenance of the actual engineering UHPC, it is recommended to adopt the steam curing system of 3 d and then standard curing for 25 d.5 tabs, 12 figs, 25 refs.

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Last Update: 2022-12-20