“ANALYSIS OF THE EFFECTS OF THE ADDITION OF SODIUM BICARBONATE IN THE CONCRETE”

Chuquiruna Miranda L.V.; Vásquez Peña J.S.; Burga Chávez M.A.; Castrejón Calderón E.A.; Taica Guevara J.; Carrión Rabanal K.N. · Proceedings of the LACCEI international Multi-conference for Engineering, Education and Technology (2024) · DOI: 10.18687/laccei2024.1.1.751

Resumen

The aim of this study was to determine the effects of sodium bicarbonate as an additive in concrete, by analyzing its properties in fresh and hardened states (temperature, slump, and compressive strength: In concrete with 0% and 10% bicarbonate; capillarity and absorption: In mortars with 0% and 10% dosage; and setting time: In paste with dosages of 0%, 10%, and 20%) and compare them with normal concrete. For this purpose, 3 samples were tested for each percentage, totaling 6 specimens, which were tested in the concrete laboratory of the Private University of the North, Cajamarca campus. Initially, the search for raw materials (fine and coarse aggregate) was conducted, which were subjected to a series of tests, along with cement to subsequently design the concrete. Subsequently, tests were conducted according to the standards that will be mentioned in a later chapter. As a result, the incorporation of bicarbonate leads to a 33.40% reduction in compressive strength; likewise, it can be noted that concrete with bicarbonate increases the temperature of the concrete, being 7.6°C higher than normal concrete. In terms of capillarity and absorption, samples with bicarbonate dosage obtained higher values, these being more than double the results of samples without bicarbonate. Additionally, setting time was the most prominent test in this research, as samples with bicarbonate dosage obtained very high results, setting 89% faster than normal Type 1 cement (28 minutes). Finally, it was concluded that bicarbonate accelerates setting time, increases absorption and capillarity, as well as temperature, causing volume changes, which in turn abruptly damages and reduces the strength of the concrete.

Instituciones: Universidad Privada del Norte