Long-term compressive strength and some other properties of controlled low strength materials made with pozzolanic cement and Class C fly ash.
Controlled low strength material (CLSM) is a flowable mixture that can be used as a backfill material in place of compacted soils. CLSM (or flowable fill) require no tamping or compaction to achieve its compressive strength and typically has a load carrying capacity much higher than that of compacted soils, but can be proportioned to allow future excavation. In this study, several different CLSM mixtures containing Class C fly ash (FA) obtained from Soma Thermal Power Plant in Turkey, crushed limestone sand (CLS), and a minimal amount of pozzolanic cement (PZC) were produced. The mass of PZC was kept constant for all mixtures at 5% of FA by mass. The mechanical and physical properties of CLSM mixtures such as unconfined compressive strength, water absorption by capillarity and EP toxicity were investigated by a series of laboratory tests. CLSM mixtures with low PZC contents and high Class C FA and CLS contents can be produced with excellent flowability and low unconfined compressive strengths in the range of 1.16-2.80 MPa at 365-days age when re-excavation at later ages might be needed. The results presented here show a new field of application for Soma FA in CLSM mixtures, resulting in great advantages in waste minimization, as well as, conservation of resources and environment.
Türkel
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Department of Civil Engineering, Dokuz Eylul University, 35160 Izmir, Turkey. selcuk.turkel@deu.edu.tr
D000042:Absorption; D002244:Carbon; D060729:Coal Ash; D019245:Compressive Strength; D003247:Conservation of Natural Resources / Q000379:methods; D003252:Construction Materials; D017745:Incineration; D007220:Industrial Waste; D019216:Metals, Heavy; D052638:Particulate Matter; D012037:Refuse Disposal / Q000295:instrumentation* / Q000379:methods*; D012822:Silicon Dioxide; D012987:Soil; D013997:Time Factors; D014867:Water
D060729:Coal Ash; D007220:Industrial Waste; D019216:Metals, Heavy; D052638:Particulate Matter; D012987:Soil; D014867:Water; D002244:Carbon; D012822:Silicon Dioxide