Optimization of CLSM Mix Proportion with Combination of Clinker Ash and Fly Ash

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Title: Optimization of CLSM Mix Proportion with Combination of Clinker Ash and Fly Ash

Author(s): Takashi Horiguchi, Hideyuki Okumura, and Noboru Saeki

Publication: Special Publication

Volume: 199

Issue:

Appears on pages(s): 307-324

Keywords: bleeding; bottom ash; clinker ash; coal ash; compressive strength; Controlled Low-Strength Materials; flowability; fly ash; LSM; mix proportioning; slump flow I

Date: 6/1/2001

Abstract:
This research evaluated, from the ecological and economical points of view, the potential use of off-specification fly ash plus non-standard clinker ash (bottom ash or coal ash) in CLSM (Controlled Low Strength Materials). The effect of mixture proportions on the short-term as well as long-term compressive strength of CLSM is mainly investigated. A wide range of fly ash/clinker ash ratio was evaluated in order to provide a cost effective mixture design for various material costs. Two different sources of fly ash including off specification fly ash and three different sources of clinker ash were used with three levels of mixture combinations. A total of 20 mixtures was tested for the flowability, bleeding and short-term and long-term compressive strengths (strength developments up to 91 days were reported in this study). Test results showed that there is an optimum combination of fly ash clinker ash ratio on the physical properties of CLSM. Compressive strength improved with increasing the rate of replacement of clinker ash up to 5 0 percent in the case. It is found that there was no disadvantage of using off-specification fly ash and non-standard clinker ash in the physical properties of CLSM. CLSM with off-specification fly ash plus non-standard clinker ash showed excellent performance on the physical properties indicating the ecological and economical applicability to CLSM.