Experimental investigation of whole stress-strain curves of coral concrete. (30th September 2016)

• Record Type: Journal Article
• Authors: Da, Bo; Yu, Hongfa; Ma, Haiyan; Tan, Yongshan; Mi, Renjie; Dou, Xuemei
• Is Part Of: Construction & building materials. Volume 122(2016)
• Page Start: 81
• Page End: 89
• Publication Date: 2016-09-30
• Subjects: Coral concrete -- Equal stress cycle loading and unloading method -- Equal strain monotonic loading method -- Whole stress-strain curve -- Elastic modulus -- Poisson's ratio; Building materials -- Periodicals; 624.18
• DOI: 10.1016/j.conbuildmat.2016.06.064
• Languages: English
• ISSNs: 0950-0618

Abstract

Highlights: Constitutive relationship of coral concrete in different strength grades was studied. Stress-strain curves of coral concrete in different strength grades were analysed. Failure of coral concrete under uniaxial compression test was studied. Possible applications of coral concrete in engineering structures were suggested. Abstract: The constitutive relationship of coral concrete (CPC) was researched using prismatic specimens under uniaxial compression. The equal stress cycle loading and unloading and equal strain monotonic loading methods were adopted. The elastic modulus ( E c ) and Poisson's ratio ( μ ) were determined. The results showed that when the specimen strain was close to the maximum, CPC was rapidly damaged in the form of splitting. The whole stress-strain curve ascent stage was composed of concave and convex curves, while the descent stage was relatively short. The ratio of residual stress ( σ ri ) and peak stress ( σ 0i ) was 0.30–0.50, and with increase in the strength grade, σri /σ0i decreased. The two-part constitutive equations of CPC were presented, which could reflect all the characteristics of the compression tests. With increase in the strength grade, the μ of coral concrete first increased and then decreased. The E c of CPC tended to increase. To expand the application of CPC in island engineering construction, superfine cement paste, silicon mortar, or polymer could be used to strengthen the coral surface. Adding steel bar, steel fibre, or organic fibre into CPC could also increase the CPC strength and tenacity.