|Table of Contents|

Research on early plastic shrinkage of cement-based materials with low water-cement ratio(PDF)

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

Issue:
2025年01期
Page:
131-138
Research Field:
建筑材料
Publishing date:

Info

Title:
Research on early plastic shrinkage of cement-based materials with low water-cement ratio
Author(s):
WANG Dianchao1; 2;  LU Zheng1;  WANG Yuanhang3;  TAN Qihang1;  ZHU Liming3
(1. College of Civil Engineering, Tongji University, Shanghai 200092, China; 2. Department of Architecture, The University of Tokyo, Tokyo 1138656, Japan; 3. China Construction Third Bureau First Engineering Co., Ltd, Wuhan 430040, Hubei, China)
Keywords:
plastic shrinkage;  digital image;  cement paste;  carbonated recycled concrete powder;  crack distribution;  maximum principal strain
PACS:
TU528
DOI:
10.19815/j.jace.2023.03066
Abstract:
In order to study the early plastic shrinkage development mechanism of concrete, explore the control effect of different shrinkage reducer on concrete shrinkage and crack development, and analyse the crack development state and principal strain change law of cement paste, the recycled concrete powder, carbonated recycled concrete powder, magnesium oxide-based expanding agent, and polyethylene fiber were selected as admixtures, and cement paste was mixed according to the corresponding mix ratio. The shrinkage crack development process of different pastes was studied by two-dimensional digital image technology(2D-DIC), and the change trend of the maximum principal strain at the midline position of the specimen under different working conditions was quantitatively evaluated. Finally, the crack development state under the action of different admixtures was evaluated by scanning electron microscopy. The results show that different materials have different effects on the crack development of early plastic shrinkage of concrete. The addition of recycled concrete powder and carbonated recycled concrete powder can effectively inhibit the early plastic shrinkage of cement paste. The carbonated recycled concrete powder can further improve the shrinkage control effect of cement paste compared with ordinary recycled concrete powder, and the crack appearance time is delayed by 10 min. The addition of polyethylene fiber can effectively increase the development time of plastic cracking and reduce the width of crack development. With the increase of pouring time, the maximum principal strain gradually increases and reaches 0.033 80 after 4.5 h. The effects of different admixtures on the development trend of principal strain are different. Under the condition of adding carbonated recycled concrete powder, the maximum principal strain is 0.027 95 at 4.5 h, which can reduce the maximum plastic principal strain by 17.30%. The cracks in cement paste without admixtures often show the characteristics of main crack penetration and scattered distribution of other cracks. When adding carbonated recycled concrete powder, the connectivity between cracks is enhanced, indicating that the addition of carbonated recycled concrete powder effectively reduces the degree of early plastic cracking of cement-based materials.

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Last Update: 2025-01-20