Influences of Water-binder Ratio and Dosage of Fly Ash on Autogeneous Shrinkage of Shrinkage-Compensating Concrete
The autogeneous shrinkage of concrete with and without calcium sulphoaluminate hydrate-calcium hydroxide expansive agent was measured, and the compensating effect of expansive agent on the autogeneous shrinkage of concrete and its compensating efficiency affected by water-binder ratio
and fly ash dosage were investigated. The results show that the expansive agent does not compensate the shrinkage within 20 h due to a lack of restrict. After that the expansive agent could be used to reduce the autogeneous shrinkage of concrete. The elevated water-binder ratio and fly ash
dosage could improve the compensating efficiency. The appropriate amount of the expansive agent (6%) could generate a sufficient expansion to compensate all the autogeneous shrinkage of concrete with water-binder ratio of 0.34 and fly ash content of 45%, and could keep it swelling constantly
after 30 h.
Keywords: autogeneous shrinkage; calcium sulphoaluminate hydrate-calcium hydroxide expansive agent; fly ash; shrinkage-compensating concrete; water- binder ratio
Document Type: Research Article
Affiliations: Key Lab of Civil Engineering Safety and Durability of China Education Ministry, Department of Civil Engineering, Tsinghua University, Beijing 100084, China
Publication date: 01 November 2012
- Journal of the Chinese Ceramic Society (JCCS), published in Chinese and in English, is a comprehensive monthly periodical focused on the fields of inorganic and non-metallic materials. The main purpose of the JCCS is to report the latest creative achievements in research, production and design for ceramics, glass, cementing materials, refractory, artificial crystals and other non-metallic materials. JCCS is regarded as an important journal in inorganic and non-metallic materials sciences in China and has been awarded by China Association for Science and Technology. The full-text of papers in JCCS is also published by CNKI (China National Knowledge Infrastructure). JCCS is indexed in EI Compendex, CA( Chemical Abstracts) ,SA and Ж and more than 20 databases.
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