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

Issue:

2023年05期

Page:

32-42

Research Field:

建筑材料

Publishing date:

Info

Title:

Value analysis of UHPC cover thickness

Author(s):

XU Gang¹; 2;  WEN Changcheng¹; 2;  WANG Qing¹; 2;  BAO Hao¹; 2;  WANG Shengwei¹; 2

(1. Hubei Key Laboratory of Disaster Prevention and Mitigation, China Three Gorges University, Yichang 443002, Hubei, China; 2. Department of Civil Engineering, China Three Gorges University, Yichang 443002, Hubei, China)

Keywords:

UHPC;  concrete cover;  bond strength;  carbonization;  chloride ion;  freeze-thaw

PACS:

TU528

DOI:

10.19815/j.jace.2022.01015

Abstract:

From the perspective of safety, applicability, durability and fire resistance, the main factors affecting the value of thickness of ultra-high performance concrete(UHPC)cover was analyzed, including bond strength, crack, deflection, carbonization, freeze-thaw, chloride ion penetration, sulfate penetration and fire resistance. In terms of safety, the minimum cover thickness of UHPC components was calculated based on the theoretical calculation method of bond strength of deformed reinforcement, and the calculation results were verified by experiments. In terms of applicability, considering the influence of steel fiber on the deflections and cracks of concrete members, the minimum requirement of cover thickness can be obtained by checking calculation. In terms of durability, factors such as carbonation, freeze-thaw, chloride ion penetration and sulfate penetration were considered respectively, and the minimum cover thickness under various environments was calculated by using the existing formula. In terms of resistance to chloride ion penetration, different environments were analyzed in detail. In addition, the fire resistance of ordinary concrete and UHPC was compared and analyzed. Finally, considering the requirements of safety, applicability, durability and fire resistance, the recommended value of UHPC cover thickness was given. The results show that the bond strength of UHPC members can be guaranteed when the cover thickness is not less than the nominal diameter of longitudinal reinforcement, and the minimum cover thickness can be reduced to not more than 0.824 times of the ordinary concrete. The performance of UHPC in resisting carbonation and freeze-thaw is far better than that of ordinary concrete, and the cover of 5 mm thickness can meet the needs of UHPC members within 100 years. The thermal conductivity of UHPC is higher than that of ordinary concrete, and the structural measures of UHPC components should be added to meet its fire protection requirements.

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Memo

Memo:

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Common functions

Last Update: 2023-09-01