Journal Published Online: 30 April 2024
Volume 52, Issue 5

Early Cracking of Cementitious Materials Based on Stress Concentration Method

CODEN: JTEVAB

Abstract

The traditional ring constraint shrinkage test method for detecting shrinkage cracking of cementitious materials has been found to have low cracking sensitivity and random occurrence of cracks. To address these problems, this study proposed an improvement ring constraint shrinkage test apparatus. The apparatus was used to analyze the stress distribution at key nodes and cross sections by theoretical and finite element methods. The study also counted the cracking time and crack location distribution of the improvement ring constraint specimens by test results. The findings showed that the average cracking time of the cement mortar that improved ring specimens was 52.4 % shorter than that of the conventional ring specimen. This significant reduction in the test observation period indicates that the improvement ring constraint shrinkage test method is highly efficient. Moreover, 98 % of the crack offset was within 27.35 mm of the expected cracking location, and the offset distance was negligible compared with the conductive coating length. These results suggest that the improvement ring constraint shrinkage test method can effectively limit the location of specimen cracking.

Author Information

Ji, Jianrui
School of Civil Engineering, Chongqing Jiaotong University, Chongqing, China Institute of Highway, Ministry of Transport, Beijing, China
Li, Lihui
Institute of Highway, Ministry of Transport, Beijing, China School of Civil Engineering, Chongqing Jiaotong University, Chongqing, China
Tian, Bo
School of Civil Engineering, Chongqing Jiaotong University, Chongqing, China Institute of Highway, Ministry of Transport, Beijing, China
Ma, Rui
School of Civil Engineering, Chongqing Jiaotong University, Chongqing, China Institute of Highway, Ministry of Transport, Beijing, China
Zhang, Panpan
School of Civil Engineering, Chongqing Jiaotong University, Chongqing, China Institute of Highway, Ministry of Transport, Beijing, China
Hu, Yanbin
Key Highway Construction Project Management Center of Tibet Autonomous Region, Lhasa, China
Gesang, Yundan
Key Highway Construction Project Management Center of Tibet Autonomous Region, Lhasa, China
Pages: 17
Price: $25.00
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Stock #: JTE20230303
ISSN: 0090-3973
DOI: 10.1520/JTE20230303