Influence of chemical admixtures on concrete shrinkage and cracking

Title: Influence of chemical admixtures on concrete shrinkage and cracking
Author(s): Z. Li, M. Qi, B. Ma
Paper category : conference
Book title: International RILEM Conference on Early Age Cracking in Cementitious Systems
Editor(s): K. Kovler and A. Bentur
Print-ISBN: 2-912143-29-2
e-ISBN: 2351580362
Publisher: RILEM Publications SARL
Publication year: 2003
Pages: 289 - 297
Total Pages: 9
Nb references: 8
Language: English

Abstract: Modern concretes often incorporate several chemical admixtures to alter the properties of fresh or hardened concrete. In this paper, the influences of three types of chemical admixtures, calcium nitrite inhibitor (CNI), retarder (D-17) and superplasticizer (W-19) on free shrinkage and restrained shrinkage cracking of high performance concrete were experimentally investigated. The test results demonstrated that, with the same water to binder ratio (0.4), mixtures containing D-17 at a content of 0.25 percent of cement and higher ratio of W-19 (2.76 percent) exhibited significant reduction in free shrinkage and shrinkage cracking width. The incorporations of various ratios of CNI into mixtures containing fly ash exhibited an increase in free shrinkage and shrinkage cracking width as compared to control mixture.

Online publication: 2010-06-02
Publication type : full_text
Public price (Euros): 0.00