Influencia del bioproducto MEF-32 como plastificante en pastas y morteros, utilizando los cementos P-35 Cienfuegos, PP-25 y B45 Siguaney
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Rodríguez Yeras, Yandy
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Universidad Central "Marta Abreu" de las Villas
Resumen
El presente trabajo investigativo está encaminado a conocer el efecto
plastificante del bioproducto MEF-32, usado en diferentes dosis en tanto
porciento del peso del cemento, al ser utilizado como aditivo en las pastas y
morteros de los cementos P-35, PP-25 y SIG-B45. Se utilizaron como
referencias el bioproducto MEF-19 y el superplastificante comercial SRC-20, de
la firma MAPEI. A través del ensayo de calorimetría isotérmica, se determinó
que el MEF-32 a la dosis del 2 % influye en la cinética de hidratación de los
cementos estudiados. Se realizó el ensayo del Minicono, con el objetivo de
seleccionar las dosis de aditivo MEF-32 de mayor influencia en el índice de
plasticidad de las pastas de los cementos evaluados y las dosis de 6 % y 8 %
fueron las de mayores IP. Al realizar un análisis estadístico multifactorial con los
resultados del Minicono, se obtuvo que tanto el tipo de cemento, el tipo de
aditivo y la dosis, tenían influencia significativa sobre el índice de plasticidad. Se
comprobó además, que la adición del bioproducto MEF-32 a las dosis 6 % y 8 %
del peso del cemento, tuvo influencia en las propiedades reológicas y físicomecánicas de las pastas y morteros de los cementos P-35, PP-25 y SIG-B45,
bajo las condiciones experimentales ensayadas. Los resultados obtenidos en
esta investigación, tanto reológicos como físico-mecánicos, contribuyen al
conocimiento acerca de los productos que se obtienen por la tecnología “EM”,
para su futuro uso como aditivo plastificante en la industria de la construcción.
The present research work aims to knowing the plasticizing effect of bioproduct MEF-32, used in different doses as weight percent of cement, when used as an additive in pastes and mortars of P-35, PP-25 and SIG-B45 cements. The bioproduct MEF-19 and commercial superplasticizer SRC-20, available from MAPEI were used as references. Through calorimetry test, it was determined that the MEF-32 at a dose of 2% affect the hydration kinetics of the cements studied. The mini-slump test was realized, with the aims of selecting the doses of MEF-32 additive with major influence on the plasticity index (PI) of the cement pastes that was tested and tested doses of 6% and 8% were the most PI. When performing a multivariate statistical analysis of the results of mini-slump test, it was observed that type of cement, type of additive and the doses had significant influence on the PI. It was also proved that the addition of byproduct MEF-32 at doses 6% and 8% by weight of cement, it has influence on the rheological and physico mechanical properties of pastes and mortars of P-35, PP-25 and SIG-B45 cements, under the experimental conditions tested. The results obtained in this research, both rheological and physical-mechanical, contribute to the knowledge of the products obtained by "EM" technology, for future use as a plasticizer additive in the construction industry.
The present research work aims to knowing the plasticizing effect of bioproduct MEF-32, used in different doses as weight percent of cement, when used as an additive in pastes and mortars of P-35, PP-25 and SIG-B45 cements. The bioproduct MEF-19 and commercial superplasticizer SRC-20, available from MAPEI were used as references. Through calorimetry test, it was determined that the MEF-32 at a dose of 2% affect the hydration kinetics of the cements studied. The mini-slump test was realized, with the aims of selecting the doses of MEF-32 additive with major influence on the plasticity index (PI) of the cement pastes that was tested and tested doses of 6% and 8% were the most PI. When performing a multivariate statistical analysis of the results of mini-slump test, it was observed that type of cement, type of additive and the doses had significant influence on the PI. It was also proved that the addition of byproduct MEF-32 at doses 6% and 8% by weight of cement, it has influence on the rheological and physico mechanical properties of pastes and mortars of P-35, PP-25 and SIG-B45 cements, under the experimental conditions tested. The results obtained in this research, both rheological and physical-mechanical, contribute to the knowledge of the products obtained by "EM" technology, for future use as a plasticizer additive in the construction industry.