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Basic Mechanical Properties of Seawater Sea-sand Recycled Concrete(PDF)

《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

Issue:
2018年02期
Page:
16-22
Research Field:
Publishing date:

Info

Title:
Basic Mechanical Properties of Seawater Sea-sand Recycled Concrete
Author(s):
XIAO Jian-zhuang ZHANG Peng ZHANG Qing-tian SHEN Jun LI Yan ZHOU Ying
College of Civil Engineering, Tongji University
Keywords:
seawater sea-sand recycled aggregate concrete mechanical property workability strength elastic modulus
PACS:
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DOI:
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Abstract:
The seawater sea-sand recycled concrete with the anticipated design strength of C20-C50 was prepared using the seawater, sea-sand and recycled coarse aggregate. Based on 240 standard cubes (150 mm×150 mm×150 mm) and 96 prism specimens (150 mm×150 mm×300 mm), the workability, cube compressive strength, axial compressive strength, splitting tensile strength and elastic modulus were tested to investigate the basic mechanical properties of seawater sea-sand recycled concrete. Finally, based on the test data, the relationships between the cube compressive strength and axial compressive strength, the elastic modulus and axial compressive strength of seawater sea-sand recycled concrete were obtained. The results show that the workability of seawater sea-and recycled concrete is well enough, and the slump of C40 and C50 seawater sea-sand recycled concrete increases by 5%, 33% than recycled concrete respectively. The cube compressive strength, axial compressive strength and splitting tensile strength increase with age, and the long-term strength tends to be stable. Compared with the ordinary concrete, the 7 d cube compressive strength of seawater sea-sand recycled concrete increases by 13%-52%, while the 28 d strength reduces about 5%, the 90 d strength reduces about 15%, and the 180 d strength reduces by 18%-29%. The 28 d elastic modulus of seawater sea-sand recycled concrete is slightly lower than that of ordinary concrete, and the decrease is within 14%. The effects of recycled coarse aggregate on the mechanical properties and workability of concrete are greater than those of seawater and sea-sand.

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Last Update: 2018-04-04