Influencia del bio- producto CBQ- VTC en la retracción de hormigones fluidos de 35 MPa
Fecha
2017-06
Autores
Enrique García, Joel Ernesto
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Editor
Universidad Central "Marta Abreu" de Las Villas. Facultad de Construcciones. Departamento de Ingeniería Civil.
Resumen
El desarrollo y los avances que provoca el uso de los aditivos en la tecnología del hormigón hacen de estos cada vez más codiciados. Los altos costos y la monopolización del mercado de aditivos químicos incentivan a países subdesarrollados incluyendo a Cuba a buscar nuevas alternativas. Una de las alternativas que se están investigando en este momento para sustituir los aditivos comerciales, se basa en el estudio de un aditivo plastificante de origen biológico, denominado por sus creadores como CBQ-VTC (Centro de Bioactivos Químicos Viscosificante Tensoactivo Controlador). En el presente trabajo se evalúa el bio-producto CBQ-VTC y su efecto sobre la retracción en hormigones fluidos de 35 Mpa, para ello se varían los porcientos del bio-producto en 2%, 3%y 4%, y el SRC-20 en un 0.8%, y la combinación del CBQ-VTC al 3% con el SRC20 al 0.5% del peso del cemento. El trabajo se realiza en tres etapas fundamentales: en la primera etapa se procede a la elaboración de las dosificaciones a emplear en las muestras y el estudio de las propiedades físico mecánicas, como son asentamiento por el cono de Abrams; en la segunda se realizan los ensayos definidos en el diseño de experimento, resistencia a compresión, retracción según la ASTM-C- 157 y el canal de retracción; en la tercera se realiza un análisis estadístico de los resultados. Los resultados de estos ensayos aportan al avance y afianzamiento del uso de la tecnología de aditivos a base de ME en hormigones y forman parte de una caracterización del bioproducto CBQ-VTC como un aditivo reductor de la retracción (SRA).
The development and the advances that the use of the additives in the technology of the concrete make cause of these more and more coveted. The high costs and monopolization of the market for chemical additives encourage underdeveloped countries including Cuba to seek new alternatives. One of the alternatives currently under investigation to replace commercial additives, is based on the study of a plasticiser additive of biological origin, called by its creators as CBQ-VTC (Center for Bioactive Chemicals Viscosifying Surfactant Controller). In the present work the bio-product CBQVTC and its effect on the retraction in fluid concretes of 35 Mpa are evaluated, for that the percentages of the bio-product are varied in 2%, 3% and 4%, and the SRC- 20 at 0.8%, and the combination of CBQ-VTC at 3% with SRC-20 at 0.5% of cement weight. The work is carried out in three fundamental stages: the first step is to prepare the dosages to be used in the samples and the study of the mechanical properties as they are settled by the cone of Abrams; In the second, the tests defined in the experimental design, compressive strength, retraction according to ASTM-C-157 and the retraction channel are performed; In the third, a statistical analysis of the results is carried out. The results of these tests contribute to the advance and reinforcement of the use of MEbased additives technology in concrete and are part of a characterization of the CBQVTC bio-product as a retraction reducing additive (SRA).
The development and the advances that the use of the additives in the technology of the concrete make cause of these more and more coveted. The high costs and monopolization of the market for chemical additives encourage underdeveloped countries including Cuba to seek new alternatives. One of the alternatives currently under investigation to replace commercial additives, is based on the study of a plasticiser additive of biological origin, called by its creators as CBQ-VTC (Center for Bioactive Chemicals Viscosifying Surfactant Controller). In the present work the bio-product CBQVTC and its effect on the retraction in fluid concretes of 35 Mpa are evaluated, for that the percentages of the bio-product are varied in 2%, 3% and 4%, and the SRC- 20 at 0.8%, and the combination of CBQ-VTC at 3% with SRC-20 at 0.5% of cement weight. The work is carried out in three fundamental stages: the first step is to prepare the dosages to be used in the samples and the study of the mechanical properties as they are settled by the cone of Abrams; In the second, the tests defined in the experimental design, compressive strength, retraction according to ASTM-C-157 and the retraction channel are performed; In the third, a statistical analysis of the results is carried out. The results of these tests contribute to the advance and reinforcement of the use of MEbased additives technology in concrete and are part of a characterization of the CBQVTC bio-product as a retraction reducing additive (SRA).
Descripción
Palabras clave
Bio- producto CBQ-VTC, Retracción, SRA, Retraction, Bio- product CBQ-VTC