|Table of Contents|

Review of ultra-high performance concrete shrinkage(PDF)

《交通运输工程学报》[ISSN:1671-1637/CN:61-1369/U]

Issue:
2018年01期
Page:
13-28
Research Field:
道路与铁道工程
Publishing date:

Info

Title:
Review of ultra-high performance concrete shrinkage
Author(s):
CHEN Bao-chun1 LI Cong1 HUANG Wei1 AN Ming-zhe2 HAN Song2 DING Qing-jun3
1. College of Civil Engineering, Fuzhou University, Fuzhou 350108, Fujian, China; 2. School of Civil Engineering, Beijing Jiaotong University, Beijing 100044, China; 3. School of Materials Science and Engineering,Wuhan University of Technology, Wuhan 430070, Hubei, China
Keywords:
bridge engineering ultra-high performance concrete shrinkage material composition shrinkage prediction model heat curing internal temperature and humidity internal curing
PACS:
U416.2
DOI:
-
Abstract:
The shrinkage characteristics of ultra-high performance concrete(UHPC)were analyzed. The general rules of UHPC contraction with time were introduced. The influences of material composition, curing regime, internal temperature and internal humidity on UHPC shrinkage were summarized. Research result indicates that the shrinkage of UHPC develops rapidly at 0-7 d, accounting for 61.3%-86.5% of total shrinkage, develops slowly from 7 d to 28 d, accounting for 13.5%-27.9%, and becomes steady after 28 d. Autogenic shrinkage is the main cause of early cracking of UHPC, and accounts for 78.6%-90.0% of total shrinkage. In term of the start point about shrinkage test, the initial time of test is 1 d(24 h)after specimen forming, and the termination time is 90 d or 120 d. In term of structural design, it may refer to the values(500-800 με)in various countries’ standards, and not to consider the residual shrinkage after heat curing. In term of shrinkage prediction models, the norms of all countries have not been uniformed yet, it can only refer to the existing models, and the shrinkage prediction models should be improved and revised. In term of component research, the quantitative impacts of types and contents of fibers and mineral admixtures on the shrinkage are research emphasis, the effect of each component on the shrinkage is different, and the evaluation indexes are relatively simple and should be combined with structural applications, preparation techniques and construction process to comprehensively evaluate the shrinkage. In term of the internal temperature and humidity fields, the research mainly concentrates on normal concretes, high-strength and high-performance concretes after 28 d, and it should be more in-depth study on the early internal temperature and humidity fields of UHPC with the large content of cementitious material, obvious difference of components, and high content of active mineral admixture. In term of reducing shrinkage, internal curing, expansive agent, shrinkage-reducing agent, coarse aggregate, and other measures are applied. Therefore, it should optimize the ratio of UHPC, rationalize the use of admixture, and adopt proper curing system and other measures to reduce the shrinkage of UHPC, but not to reduce its mechanical properties. 3 figs, 133 refs.

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Last Update: 2018-03-28