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:
- -
- DOI:
- -
- 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.
Last Update: 2018-04-04