A Review on An Investigation into the Role of Nano-Silica with Light Weight Concrete for Better Replacement of Coarse Aggregate.

Civil Engineering

Abstract A lot of Investigation has been done on the Nano-silica show its impact on improving both strength and durability of concrete. The lightweight materials could decrease the dead load, weight of beams, columns, and foundation. Lightweight aggregates used in structural lightweight concrete are typically expanded shale, clay or slate materials that have been fired in a rotary kiln to develop a porous structure. Other products such as air-cooled blast furnace slag are also used. This types of concrete is variously knows as aerated, cellular, foamed or gas concrete. The objective of this research is to investigate the performance of lightweight concrete with Nano-silica. Different concrete mixes with 350 kg/m3 cement content and 0.4 as a constant water-cement ratio were produced with different dosage of Nano-silica Different mixes were produced using LECA with different dosage of Nano- silica (0.75%, 1.5%, and 2%). Strength and durability of all mixtures were studied, also the microstructure of concrete mixes was observed. The test results confirmed that using Nano-silica developed the compressive and tensile strength. At the compressive strength, it is considered that the percent 0.75% of Nano- silica is the ideal percentage at ages 7, 28 and 90 days. Adding Nano-silica produced more homogeneity and fewer voids in the concrete microstructure. Comparing the results of this research by the results of previous research, this investigation has proved a clear upgrading strengths using LECA with Nano-silica at densities (1400-1600) kg/m3.

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