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2. Comparison of geopolymer fly ash and ordinary portland cement to the strength of concrete;Al Bakri;Adv. Sci. Lett.,2013
3. Standard Specification for Flexural Strength of Soil-Cement Using Simple Beam with Third-Point Loading (D1635/D1635M − 12);ASTM,2012
4. Standard Test Methods for Moisture, Ash, and Organic Matter of Peat and Other Organic Soils (ASTM D2974 – 14);ASTM,2014
5. Standard Specification for Unconfined Compressive Strength of Cohesive Soil (D2166/D2166M − 16). West;ASTM,2016