Abstract
Oil pollution into the concrete composed materials, leads to decrease the compressive strength of the constructed structure. In the present study, effect of using a natural pozzolan named Zeolite on concrete structures was tested in different marine conditions. A fixed amount of oil equal to 2% of sand weight was added as the pollution into the concrete composed materials. Natural Zeolite was added into the concrete instead of cement to the mix design with weight percentages of 10, 15 and 20. After preparing and curing, concrete specimens were placed into the three different conditions: fresh water, tidal, and sea water environments. Results of compressive strength tests showed that replacement of natural Zeolite instead of cement significantly increased compressive strength in comparison with control specimens, in all environments. Adding 20% natural Zeolite increased the compressive strength to its highest values about 60-85% higher than control specimens.
Highlights
Concrete is one of the most applicable materials in construction projects
In terms of maximum fc, Control Specimen (CS) was almost similar to those mixed with Natural Zeolite (NZ) and the maximum fc of CS was occurred in the fresh water environment
Among various specimens in different conditions, the maximum fc was observed in fresh water environment and the minimum fc was observed in tidal and sea water environments
Summary
Concrete is one of the most applicable materials in construction projects. Some effective factors on the compressive strength (fc) of concrete are W/C, compaction degree; type of cement, aggregate grade, mixing method, placement, curing method and presence of contaminates [1]. Attom et al conducted an experimental study to assess the fc mixed with sand contaminated by crude oil products Their results showed that fc of new concrete specimens decreased more than 42% compared to the control concrete. Sabet et al published their findings about mechanical and durability properties of self-consolidating high performance concrete incorporating NZ, silica fume and fly ash Their results showed that incorporation of mineral admixtures generally improve mechanical and durability characteristics of the mixes. The mechanical and durability properties of concretes containing 10% of NZ and super plasticizer, as well as 10% of NZ, super plasticizer and an air-entraining agent in comparison to concretes without NZ Their results reveal the considerable effect of using a super plasticizer and an air-entraining agent in Zeolite incorporating concretes on water penetration, drying shrinkage and freeze–thaw resistance of concretes [24]. Based on obtained data from experiments, fc were plotted and analyzed in different scenarios
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