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Developing high-performance concrete incorporating highly-reactive rice husk ash
Producción de concretos de alto desempeño mediante la incorporación de ceniza de cascarilla de arroz de alta reactividad
DOI:
https://doi.org/10.15446/ing.investig.v33n2.39517Keywords:
pozzolanic materials, rice husk ash, sustainability, high performance concrete (en)materiales puzolánicos, ceniza de cascarilla de arroz, sostenibilidad, concretos de alto desempeño (es)
The aim of this study is to present results of an investigation about the developing of a high-performance concrete (HPC) using a highly reactive pozzolan made from chemically treated rice husk ash (ChRHA) prepared by a chemical-thermal attack to the rice husk. This particular rice husk ash (RHA) consists of 99% of silica, highly amorphous, white in color and of greater pozzolanic activity than the silica fume and another rice husk ash prepared with only by a thermal treatment. The results of the physical, chemical and mineralogical characteristics of ChRHA are analyzed. In this study, the compressive strength, flexural strength, water absorption, resistance to carbonation, total charge-passed derived from rapid chloride permeability test (RCPT) and modulus of elasticity of hardened concrete were determined in the laboratory. Test results indicate that it is possible to produce HPC with the incorporation the chemically treated RHA. The incorporation of the chemically treated rice husk ash into the concrete enhances the compressive strengthand the durability properties being comparable to the properties of high performance concretes with silica fume (SF) made with the same replacement levels.
El propósito del presente estudio es el de investigar la posibilidad de producir concretos de alto desempeño (HPC, por sus siglas en inglés) mediante el uso de un material puzolánico de alta reactividad elaborado a partir de ceniza de cascarilla de arroz tratada químicamente (ChRHA, por sus siglas en inglés) y preparada mediante un ataque térmico-químico a la cascarilla de arroz. Esta particular ceniza de cascarilla de arroz consiste de 99% sílice de alta amorfidad, blanca, con mayor actividad puzolánica que el humo de sílice y que la ceniza de cascarilla de arroz preparada únicamente con tratamiento térmico (TRHA, por sus siglas en inglés). Las características físicas, químicas y mineralógicas de las cenizas producidas fueron analizadas. En el presente estudio se evaluó la resistencia a la compresión, la resistencia a la flexión, la absorción de agua, la resistencia a la carbonatación, la carga total que pasa, derivada del ensayo rápido de permeabilidad a cloruros (RCPT, por sus siglas en inglés) y el módulo de elasticidad de los concretos endurecidos. Los resultados obtenidos de los ensayos indican que es posible producir concretos de alto desempeño con la incorporación de RHA tratada químicamente (ChRHA) en las mezclas de concretos, mejorando las propiedades mecánicas y de durabilidad, que son comparables a las propiedades de concretos de alto desempeño con humo de sílice (SF, por sus siglas en inglés) manufacturados con los mismos niveles de reemplazo.
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Copyright (c) 2013 Andrés Salas, Silvio Delvasto, Ruby Mejía de Gutiérrez
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