Fly Ash in Controlled Low Strength Material - Technical Bulletin

Controlled Low Strength Material (CLSM), an easy-to-place, flowable material consisting of fly ash, cement, sand, water, and 8-25% entrained air, is a slurry when placed and a low-strength engineered material when hardened. It is self-leveling, so it requires no compaction or vibration. The compressive strength can be designed to range from 0.35 MPa (50 psi) to 8 MPa (1200 psi). With compressive strengths of less than 1 MPa (150 psi), CLSM can be readily excavated.