Uso de suelos arcillosos como adiciones minerales activas en el hormigón
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Rocha Francisco, Dayran
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Universidad Central "Marta Abreu" de las Villas
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En el presente trabajo se estudia el uso de adiciones minerales activas como
materiales cementicios suplementarios al Cemento Pórtland Ordinario (CPO),
usando sustituciones de un 20, un 30 y un 40% de su peso. Fueron utilizados
suelos arcillosos de la localidad de Manicaragua. Éstos se calcinaron a 900 °C
durante 60 minutos en una mufla y se molieron durante 120 minutos en un
molino de bolas MB-600. El objetivo general de esta investigación es evaluar a
escala de laboratorio las propiedades mecánicas en microhormigones, con
porcientos de sustitución de CPO por arcillas calcinadas de la localidad de
Manicaragua, de manera que se demuestre su eficiencia como adiciones
puzolánicas capaces de mantener o mejorar las características mecánicas del
hormigón con una reducción de cemento en la mezcla, lo que contribuye a la
preservación medioambiental.
Las resistencias a la compresión y a la flexión de microhormigones
sustituyendo los porcientos anteriormente mencionados de cemento por las
puzolanas analizadas son, al día, menores que las de la muestra patrón con un
100% de CPO, debido a que las puzolanas no reaccionan a edades tempranas.
Ya a los 7 días estos valores tienden a igualarse, y a los 28 días los
microhormigones con adiciones activas para determinados porcientos de
sustitución tienen resistencias superiores al patrón. Especial atención merece
el hecho de que estos microhormigones alcanzan resistencias a la compresión
tales que los ubica dentro del grupo de hormigones de altas resistencias,
utilizando menor cantidad de cemento en la mezcla.
This major paper deals with the use of active mineral admixtures such as supplementary cementitious materials of Ordinary Portland Cement (OPC), by using substitutions of 20, 30 and 40% of its weight. Clayey soils from Manicaragua town were used to carry out this study. These soils were calcined to 900 °C during 60 minutes in an oven and were grounded during 120 minutes in a MB-600 ball mill. The general objective of this research is to evaluate the micro-concretes mechanic properties at lab scale, substituting OPC percents for calcined clays from Manicaragua town in order to demonstrate its efficiency as pozzolanic admixtures to maintain or improve the concrete mechanic characteristics with a cement reduction in the mixture which contributes to the environment preservation. In one day, these micro-concretes have less compression and flexion strength than the pattern sample with a 100% of OPC due to pozzolans does not react in early ages. After seven days, these figures are the same, and after 28 days the micro-concretes with active admixtures for certain substitution percents are more resistant than the control. It must be highlighted that these strength values make these micro-concretes be within the group of high strength microconcretes, using a minor amount of cement in the mixture.
This major paper deals with the use of active mineral admixtures such as supplementary cementitious materials of Ordinary Portland Cement (OPC), by using substitutions of 20, 30 and 40% of its weight. Clayey soils from Manicaragua town were used to carry out this study. These soils were calcined to 900 °C during 60 minutes in an oven and were grounded during 120 minutes in a MB-600 ball mill. The general objective of this research is to evaluate the micro-concretes mechanic properties at lab scale, substituting OPC percents for calcined clays from Manicaragua town in order to demonstrate its efficiency as pozzolanic admixtures to maintain or improve the concrete mechanic characteristics with a cement reduction in the mixture which contributes to the environment preservation. In one day, these micro-concretes have less compression and flexion strength than the pattern sample with a 100% of OPC due to pozzolans does not react in early ages. After seven days, these figures are the same, and after 28 days the micro-concretes with active admixtures for certain substitution percents are more resistant than the control. It must be highlighted that these strength values make these micro-concretes be within the group of high strength microconcretes, using a minor amount of cement in the mixture.