Controlled Low-Strength Material Containing Foundry Sand for Beneficial Uses: Examining Mixture Designs in the Laboratory

摘要

The research study was performed to document and evaluate engineering properties of controlled low-strength material containing by-product foundry sand (FS-CLSM). Mixtures containing predominantly clay-bonded (green) and chemically bonded (nobake) sands were compared in the plastic and hardened states against control design mixtures containing natural fine aggregate, uniformly graded. The data presented showed FS-CLSM can be successfully used in this type of product. The FS assisted in keeping the compressive strength from exceeding the desired upper limit. The fresh properties of FS-CLSM were different from that containing only natural sand. Clay-bonded sands retarded the setting time, while chemically bonded sands required a reduction in water to control bleeding. General CLSM containing a combination of fly ash and chemically bonded sands was shown to have excellent characteristics for flowable backfill and excavatable base material. CLSM mixture designs from several state Departments of Transportation (DOTs) were summarized (Table 1).