Role of Constituents on the Behavior of Flowable Fly Ash Fill

by C. Vipulanandan, (M.ASCE), CIGMAT, University of Houston, Houston, TX 77204-4791, United States,
Y. Weng, CIGMAT, University of Houston, Houston, TX 77204-4791, United States,
C. Zhang, CIGMAT, University of Houston, Houston, TX 77204-4791, United States,



Document Type: Proceeding Paper

Part of: Recycled Materials in Geotechnical Applications

Abstract: Flowable fills are increasingly used as backfill materials for pipes and retaining structures because of ease of placement and performance of the solidified material. But the role of its constituents on the working and mechanical properties of the flowable fill are not well understood. In this study, flowability, setting time and mechanical properties of various constituents of the flowable fills were investigated. Cement required almost double the quantity of water compared to fly ash (Class-F) to achieve similar flowability (Flow Table method). The Behavior of two fly ash (Class-F) rich flowable with mixtures with different cement contents (1.5 and 3%) was investigated. The 28-day compressive strength for the two mixtures were 1.6 and 5.7 MPa. Several methods were used to quantify the flowability and setting time of the flowable fills. Effects of cement on the compressive and tensile strengths of the solidified flowable fill were investigated. The relationship between tensile strength and compressive strength of the binders and the flowable fills were linear and the strength ratios varied between 0.11 and 0.16.

Subject Headings: Compressive strength | Ultimate strength | Fills | Cement | Fly ash | Pipe materials | Construction materials

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