Engineering Properties of Marine Clay Admixed with Portland Cement and Blended Cement with Siliceous Fly Ash

This paper presents a laboratory study on the engineering properties of marine clay admixed with siliceous fly-ash-blended cement and ordinary portland cement (OPC) through an unconfined compression test, split tensile test, bender element test, and isotropic compression test. Specimens with 20–100% of cement by weight of dry soil and 100–133% of water by weight of soil and cement solid-cured for 7–150 days were investigated for both fly-ash–cement-admixed clay and OPC-admixed clay. The results showed that the short-term strength gain of marine clay admixed with fly-ash-blended cement (FAC) is significantly lower than that of OPC-admixed clay. However, the long-term strength gains are similar, with the fly-ash–cement-admixed clay manifesting more sustained gains for curing periods beyond 28 days. The difference in the rate of strength gain between FAC-admixed clay and OPC-admixed clay is attributed to the greater prominence of the pozzolanic reaction in the fly-ash-blended cement. In order to reflect the slower initial rate of strength gain arising from the pozzolanic reaction, a generalized hyperbolic strength-gain-time function was postulated for fly ash. By superimposing the individual strength contributions of the OPC and fly ash, a semiempirical relationship for the gain in strength with time for marine clay treated by fly-ash-blended cement is obtained, which gives good agreement with the measured data. Other properties studied herein include isotropic yield strength, tensile strength, and small-strain modulus. The results show that all these properties are well-correlated to the unconfined compressive strength by linear function regardless of whether OPC or fly-ash-blended cement is used.

• Record URL:
  https://doi.org/10.1061/(ASCE)MT.1943-5533.0002014
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/08991561
• Supplemental Notes:
  • © 2017 American Society of Civil Engineers.
• Authors:
  • Xiao, Huawen
  • Shen, Wanghui
  • Lee, Fook Hou
• Publication Date: 2017-10

Language

• English

Media Info

• Media Type: Web
• Features: References;
• Pagination: 04017177
• Serial:
  • Journal of Materials in Civil Engineering
  • Volume: 29
  • Issue Number: 10
  • Publisher: American Society of Civil Engineers
  • ISSN: 0899-1561
  • EISSN: 1943-5533
  • Serial URL: http://ascelibrary.org/journal/jmcee7

Subject/Index Terms

• TRT Terms: Admixtures; Blends; Compressive strength; Concrete curing; Fly ash; Marine clays; Portland cement; Silica; Tensile strength; Tension tests
• Subject Areas: Geotechnology; Highways; Materials; Pavements;

Filing Info

• Accession Number: 01642300
• Record Type: Publication
• Files: TRIS, ASCE
• Created Date: Jul 27 2017 10:05AM