Effects of Partial Replacement of Cement by Sugarcane Bagasse Ash on the Settlement and Compressive Strength of Concrete

Huillca A.; Rodríguez W. · Revista Politecnica (2024) · DOI: 10.33333/rp.vol54n2.10

Resumen

The construction industry, crucial to emerging economies, emits approximately 30 % of global CO2 emissions. Cement, essential in concrete production, accounts for up to 15 % of the total volume, yet its manufacture releases around 7 % of CO2. It is therefore important to look for replacement alternatives such as sugarcane bagasse CBCA ash. In this investigation, mixtures were made with different percentages of CBCA (0 %, 5 %, 10 %, 15 % and 20 %), before mixing the aggregates and CBCA were carefully characterized, concrete molds were subsequently prepared in 10x20 cm cylinders, at the same time of the preparation of the molds the Slump test was carried out. At 7, 14 and 28 days of curing, the compression test of the concrete molds was performed. The results show that the 5% mixture showed a greater settlement, however, as the percentage of CBCA increases the settlement tends to decline. On the other hand, the compression strength at 28 days, the mixture with 0 % reached 177,47 kg/cm2, exceeding 175 kg/cm2 design. With 5 % CBCA, the average resistance was 136,07 kg/cm2, for 10 % 124,1 kg/cm2, for 15 % 97,75 kg/cm2 and for 20 % 69,84 kg/cm2. It is concluded that both settlement and resistance are directly related to the degree of specific surface value, specific gravity and combustion temperature. The use of CBCA is recommended in 5 %, with specific areas greater than 3 000 cm2/g, gravities greater than 2 000 kg/m3 and a combustion temperature of between 500-750 °C to ensure the obtaining of amorphous particles.

Instituciones: Universidad San Ignacio de Loyola