Abstract
The silica-rich supplementary cementitious materials (SCMs) are the key components of mechanical and microstructural properties. The use of SCMs results in improving the mechanical and microstructural properties and decreasing the environmental burden caused by cement production. In this regard, this paper reports a study to compare the influence of silica-rich supplementary cementitious materials (slag, fly ash, and bottom ash) having similar Blaine fineness on cement mortar composites in terms of mechanical and microstructural properties. The Blaine fineness of supplementary cementitious materials was chosen at cement Blaine fineness by using short grinding time due to minimize energy consumption and cost. Supplementary cementitious materials (slag, fly ash, and bottom ash) were ground at similar cement Blaine fineness (~ 3300 cm2/g) and then by replacing 5 % and 20 % with cement, the 7-, 28-, 90-day mechanical and microstructural properties of cement mortar composites incorporating SCMs were examined. As a result, it was observed that the compressive strength properties of cement mortar composites incorporating 20 % slag gave similar strength of control samples (without SCM) according to samples with fly ash and bottom ash having similar fineness and this will decrease the required amount of cement and grinding time for the target strength properties, thus the number of CO2 emitted to nature will also decrease and less energy consumption, and the cost-effectiveness will be ensured by shorter grinding time for target strength.
Highlights
Supplementary cementitious materials (SCMs), including fly ash, ground granulated blast furnace slag, bottom ash, silica fume, etc., are widely used in clinker to make Portland cement or added as a replacement for a portion of ordinary Portland cement in concrete [1,2,3,4,5,6]
At 7 days old samples with a 20% replacement ratio, the highest compressive strength result was observed in samples with slag replacement, and the lowest compressive strength was observed in samples with bottom ash
At 28 days old samples with a 20% replacement ratio, the highest compressive strength result was observed in samples with slag replacement, and the lowest compressive strength was observed in samples with bottom ash
Summary
Supplementary cementitious materials (SCMs), including fly ash, ground granulated blast furnace slag, bottom ash, silica fume, etc., are widely used in clinker to make Portland cement or added as a replacement for a portion of ordinary Portland cement in concrete [1,2,3,4,5,6]. One of the main methods of reducing this emission is to keep the properties of cement as a building material and to substitute industrial by-products with the cement Their utilization in concrete can serve as an effective means of disposal. Their utilization as supplementary cementitious materials to partially replace cement could protect the natural resources needed to produce cement and can contribute to sustainable concrete manufacture
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