Title: Low-Strength Concrete and Controlled Low-Strength Material (CLSM) Produced With Class F Fly Ash

Author(s): T. R. Naik and B. W. Ramme

Publication: Symposium Paper

Volume: 150

Issue:

Appears on pages(s): 1-14

Keywords: backfilling; compressive strength; controlled low-strength material (CLSM); density (mass/volume); flowability; flowable fill; fly ash; low-strength concrete; mix proportioning; slump; slurries; tests; Materials Research

DOI: 10.14359/4071

Date: 6/1/1994

Abstract:
Presents results of research performed to identify optimum mix proportions for production of controlled low-strength materials (CLSM) with high fly ash content. CLSM is defined by ACI Committee 229 as a cementitious material that is in a flowable state at the time of placement, with a specified compressive strength of 1200 psi (8.3 MPa or 172,800 psf) or less at 28 days. The fly ash used in this study met the requirements of ASTM C 618 for Class F material. Tests were carried out on concrete designed for 500 to 1500 psi compressive strength at 28 days, with fly ash contents of approximately 500 lb/yd 3. Slump was held at 8 ¦1 in. for all mixes produced. Compressive strengths at 28 days were found to range from 290 to 1640 psi. Construction experience and other planned applications are also discussed. 141-494