Properties of controlled low-strength material containing foundry sand

This research study was performed to document and evaluate engineering prop erties of controlled low-strength materials containing by-product foundry s and (FS-CLSM). Mixtures containing clay-bonded and chemically bonded sand w ere compared in the plastic and hardened states to CLSM mixtures containing uniformly graded crushed limestone sand. The data presented show that by p roduct foundry sand can be successfully used in CLSM and it provides simila r or better properties to that of CLSM containing crushed limestone sand. T he foundry sand assisted in keeping the strength from exceeding the desired upper limit of 700 kPa. Claybonded sand retarded the setting time, and che mically bonded sands required a reduction in water to control bleeding. CLS M containing a combination of fly ash and chemically bonded sands was shown to have excellent characteristics for flowable backfill and excavatable ba se material.