Influencia del porcentaje de agregado de concreto reciclado con plastificante y método de curado sobre la resistencia a la Compresión y Peso unitario en un concreto estructural
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Date
2024-07
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Universidad Nacional de Trujillo
Abstract
En esta investigación, tuvo por objetivo evaluar el efecto del porcentaje de ACR
con plastificantes y método de curado sobre la resistencia a la compresión (ASTM C33)
y peso unitario (ASTM C29) en un concreto estructural.
En la actualidad, se reconoce que los residuos sólidos generados por la
construcción y demolición han ocasionado una acumulación de concreto, en diferentes
zonas urbanas y rurales, el cual afecta al espacio público y genera contaminación
ambiental. Para abordar este problema, se propone reducir, reutilizar y reciclar estos
desechos sólidos.
En este estudio, se emplearon los siguientes materiales: agregado grueso de TMN
de 3/4'', agregado fino con módulo de finura de 2.5, cemento tipo ICo Pacasmayo
Extraforte, agua potable de laboratorio, aditivo plastificante SikaCem, curador
Chemaplast y concreto reciclado. El diseño de la mezcla para concreto con dimensiones
de 200mmx100mm, siguiendo la norma ACI 211, fue de una resistencia a la compresión
de 210 kg/ c𝑚2, evaluados en dos métodos de curado, por inmersión y por membrana a 7
y 28dias. Las proporciones de reemplazo de agregado grueso por agregado de concreto
reciclado fueron: 0%, 15%, 30%, 45%, 60% y 75%. El uso del aditivo fue del 1 al 3%, se
llevó a cabo conforme a las normativas ASTM C494 y la ficha técnica correspondiente.
En la evaluación realizada, se obtuvieron los mejores resultados al utilizar un 60% de
agregado de concreto reciclado (A.C.R.) con respecto a la muestra patrón, con una
resistencia a la compresión máxima a los 28 días de 325 kg/c𝑚2 frente a 285 kg/c𝑚2
Además, para el ensayo de peso unitario del concreto fresco, se obtuvieron valores entre
2.42 y 2.53 g/c𝑚3, conforme a la norma ASTM C138.A diferencia de la proporción de
75% de A.C.R. que empezó a disminuir la comprensión y peso unitario. Se logró
determinar y evaluar la resistencia a la compresión para cada porcentaje de A.C.R. con
plastificante del 15 al 75%, donde obtenemos un mejor resultado en un curado por
membrana, de una mejora de un 10% kg/c𝑚2, a comparación del curado por inmersión
en agua, en cuanto al peso unitario su efecto no fue muy significativo. Finalmente se
determinó que la mejor dosificación óptima de A.C.R mencionados es del 45 % de
sustitución, con plastificante del 2 en los ensayos realizados.
The objective of this research was to evaluate the effect of the percentage of ACR with plasticizers and curing method on the compressive strength (NTP 339.034) and unit weight (ASTM C29) of a structural concrete. Currently, it is recognized that the solid waste generated by construction and demolition has caused an accumulation of concrete in different urban and rural areas, which affects public spaces and generates environmental contamination. To address this problem, it is proposed to reduce, reuse, and recycle this solid waste. In this study, the following materials were used: 3/4'' TMN coarse aggregate, fine aggregate with a fineness modulus of 2.6, ICo Pacasmayo Extraforte cement, laboratory potable water, SikaCem plasticizing admixture, Chemaplast curing agent and recycled concrete. The mix design for concrete with dimensions of 200mmx100mm, following the ACI 211 standard, had a compressive strength of 210 kg/c𝑚2, evaluated in two curing methods, by immersion and by membrane at 28 days. The proportions of replacement of coarse aggregate by recycled concrete aggregate (A.C.R.) were: 0%, 15%, 30%, 45%, 60% and 75%. The use of the admixture was carried out in accordance with ASTM C494, and the corresponding technical data sheet. In the evaluation carried out, the best results were obtained when using 60% recycled concrete aggregate (A.C.R.) with respect to the standard sample, with a maximum compressive strength at 28 days of 324. 7 kg/c𝑚2compared to 285 kg/ c𝑚2. In addition, for the unit weight test of fresh concrete, values between 2.42 and 2.53 g/ c𝑚3were obtained, in accordance with ASTM C138.Unlike the 75% proportion of R.C.A., which began to decrease the compression and unit weight. It was possible to determine and evaluate the dosage for the percentage of A.C.R. with plasticizer from 15 to 75%, where we obtained a better curing, by membrane, this allowed us to obtain a mixture with good workability and adequate compression resistance, in terms of unit weight its effect was not very significant. Finally, the optimal A.C.R ranges mentioned are considered to be 45 % replacement, with 2 % plasticizer in the tests carried out.
The objective of this research was to evaluate the effect of the percentage of ACR with plasticizers and curing method on the compressive strength (NTP 339.034) and unit weight (ASTM C29) of a structural concrete. Currently, it is recognized that the solid waste generated by construction and demolition has caused an accumulation of concrete in different urban and rural areas, which affects public spaces and generates environmental contamination. To address this problem, it is proposed to reduce, reuse, and recycle this solid waste. In this study, the following materials were used: 3/4'' TMN coarse aggregate, fine aggregate with a fineness modulus of 2.6, ICo Pacasmayo Extraforte cement, laboratory potable water, SikaCem plasticizing admixture, Chemaplast curing agent and recycled concrete. The mix design for concrete with dimensions of 200mmx100mm, following the ACI 211 standard, had a compressive strength of 210 kg/c𝑚2, evaluated in two curing methods, by immersion and by membrane at 28 days. The proportions of replacement of coarse aggregate by recycled concrete aggregate (A.C.R.) were: 0%, 15%, 30%, 45%, 60% and 75%. The use of the admixture was carried out in accordance with ASTM C494, and the corresponding technical data sheet. In the evaluation carried out, the best results were obtained when using 60% recycled concrete aggregate (A.C.R.) with respect to the standard sample, with a maximum compressive strength at 28 days of 324. 7 kg/c𝑚2compared to 285 kg/ c𝑚2. In addition, for the unit weight test of fresh concrete, values between 2.42 and 2.53 g/ c𝑚3were obtained, in accordance with ASTM C138.Unlike the 75% proportion of R.C.A., which began to decrease the compression and unit weight. It was possible to determine and evaluate the dosage for the percentage of A.C.R. with plasticizer from 15 to 75%, where we obtained a better curing, by membrane, this allowed us to obtain a mixture with good workability and adequate compression resistance, in terms of unit weight its effect was not very significant. Finally, the optimal A.C.R ranges mentioned are considered to be 45 % replacement, with 2 % plasticizer in the tests carried out.
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TECHNOLOGY::Materials science::Other materials science