Engineering properties of controlled low-strength materials containing waste oyster shells

• Published in: Construction & building materials 2013-09, Vol.46, p.128-133
• Main Authors: Kuo, Wen-Ten, Wang, Her-Yung, Shu, Chun-Ya, Su, De-Sin
• Format: Article
• Language: English
• Subjects: Analysis; Cement; Controlled low-strength materials (CLSM); Durability; Engineering properties; Fine aggregate; Mechanical properties; Properties; Waste oyster shells (WOS)
• ISSN: 0950-0618
• DOI: 10.1016/j.conbuildmat.2013.04.020

•We provide the feasibility of mixing WOS with recycled materials.•The workability of the WOS CLSM was met the requirements of ASTM D6103.•The early-stage compressive strength of WOS CLSM is achieves ASTM standard requirement.•The optimal WOS replacement of 5% is suggested for concerning of construction.•The WOS is a feasible material for CLSM. To evaluate the practical application of waste oyster shells (WOS) as controlled low-strength materials (CLSM), using a reference sample and four fine aggregate replacement 5%, 10%, 15% and 20% WOS sand, and the cement was replaced by 20% fly ash of the materials were tested. The hardened properties and the durability are tested and other various engineering properties are investigated. The experimental results demonstrate that there was no significant reduction in the compressive strength up to 20% of dosages of WOS sand instead of sand, and a proper amount of fly ash material and WOS sand for the replacement of the fine aggregate in cement mortar fills material pores, reduces the absorption rate. WOS sand can be resources of pure calcareous materials and effective in replacement of sand, indicating appropriate application of oyster shells, it is feasible to use in CLSM.