Suppression of Alkali- Silica Reactions in Concrete by Partially Replacing Cement with Cassava Peel Ash

Abstract

Listen

Translate article

Concrete is a man-made composite material having mechanical qualities similar to lime stone pebbles found in nature. A reaction known as Alkali- Silica Reactions (ASR), however, diminishes the durability of concrete structures. Researchers have suggested that replacing a portion of the Portland cement in concrete with pozzolans is an effective strategy to prevent ASR. Much study has been done on how to decrease the incidence of ASR in concrete utilizing various supplementary cementitious materials. One area where there is a knowledge gap and not much has been explored is the function of cassava peel ash (CPA) in reducing the occurrence of ASR in Concrete. This study investigates the use of Cassava peel ash (CPA) in replacing cement to suppress (ASR) in concrete. Cassava peels were dried before being burned for 90 minutes at 850°C in an electric furnace. Concrete samples with water cement ratio of 0.65 were produced with a 1:1:2 mix ratio at 0 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">%</sup> ,5 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">%</sup> , 10%, 15 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">%</sup> ,20 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">%</sup> , and 30% CPA replacement. A set of samples of 30 x 30 x 150mm was cured in NaOH appropriately for ASR evaluation and another set of 150 x 150 x 150mm was used for water and acid solubility test. X-ray fluorescence (XRF) spectroscopy was used to determine CPA's elemental makeup. At 0%, 5%, 10%, 15%, 20%, and 30% CPA replacement levels, the concrete expansion values are 0.039mm, 0.025mm, 0.013mm, 0.027mm, 0.04mm, and 0.056mm on the 28th day. According to the findings, replacing 10% of cement with CPA had the greatest effect on alkali- silica reactivity and might be used to manage alkali- silica reactions in concrete.