Abstract
Seawater and sea sand are used in concrete to reduce the consumption of freshwater and river sand. To improve the mechanical properties and cracking resistance of concrete, polymer fiber is commonly used. In this study, polyoxymethylene (POM) fiber was innovatively applied to seawater sea-sand concrete (SWSSC), and the workability, early-age cracking behavior, and mechanical properties of SWSSC reinforced with POM fiber were investigated experimentally. A total of 6 kinds of SWSSC mixtures and 72 specimens were included. The test results indicated that with increases in fiber volume fractions (ρ), the workability of SWSSC decreased correspondingly. Compared with plain SWSSC, for SWSSC with ρ = 1%, the decreases in slump and expansibility were 110.6 and 91.9 mm, respectively. POM fiber had a significant enhancing effect on the early-age cracking resistance of SWSSC. Compared with those of plain SWSSC, the cracking indices ac, bc, and cc of the POM-1 specimen decreased by 77.0%, 89.4%, and 97.6%, respectively. Cube and axial compressive tests, splitting tensile tests, and flexural tests were conducted to clarify the effects of POM fiber on the mechanical properties of SWSSC. Compared with plain SWSSC, SWSSC with POM fiber performed better in terms of mechanical properties. Predictive equations were proposed to quantify the effects of POM fiber on the mechanical properties of SWSSC. The failure performances of the SWSSC specimens were discussed and their complete stress–strain curve was analyzed. A stress–strain model for SWSSC was suggested. According to the model, the complete stress–strain curve of SWSSC with any POM fiber content could be determined.
Funder
THE NATIONAL NATURAL SCIENCE FOUNDATION OF CHINA
THE SPECIAL FUNDING FOR RESEARCH PROJECTS OF POSTDOCTORAL RESEARCHERS IN CHONGQING
Subject
Polymers and Plastics,General Chemistry
Reference64 articles.
1. Experimental and numerical investigation on the L-joint composed of steel-plate composite (SC) walls under seismic loading;Eng. Struct.,2020
2. Behavior of L-joint composed of steel-plate composite wall and reinforced concrete wall;J. Constr. Steel Res.,2020
3. Use of sea-sand and seawater in concrete construction: Current status and future opportunities;Constr. Build. Mater.,2017
4. Fresh and hardened properties of seawater-mixed concrete;Constr. Build. Mater.,2018
5. Material Alternatives for Concrete Structures on Remote Islands: Based on Life-cycle cost Analysis;Adv. Civ. Eng.,2022
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