Effect of Rice Husk Ash on the Mechanical Properties and Microstructure of Concrete Subjected to High Temperatures

AbstractMineral admixtures in portland cement–based concrete, such as rice husk ash (RHA), improve the mechanical strength and durability under normal conditions and ambient temperature. However, more knowledge is needed on the behavior of concretes with these materials when subjected to fire condit...

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Bibliographic Details
Published in:Journal of materials in civil engineering 2023-04, Vol.35 (4)
Main Authors: Kramer, Henrique dos Santos, Daronco, Alec Sobroza, de Vargas, Alexandre Silva, Kirchhof, Larissa Degliuomini, da Costa, Eugênio Bastos, de Lima, Rogério Cattelan Antocheves
Format: Article
Language:English
Subjects:
Admixtures
Ambient temperature
Ashes
Building materials
Cement
Civil engineering
Composition
Compressive strength
Concrete
Dehydration
Heating
High temperature
Mechanical properties
Modulus of elasticity
Portland cements
Spalling
Technical Papers
Temperature
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Summary:AbstractMineral admixtures in portland cement–based concrete, such as rice husk ash (RHA), improve the mechanical strength and durability under normal conditions and ambient temperature. However, more knowledge is needed on the behavior of concretes with these materials when subjected to fire conditions. Fire conditions are characterized by an expressive increase in temperature in the structure in a short period. Thus, this study aimed to evaluate the effect of partial portland cement replacement with RHA in concretes subjected to different temperatures. Parameters examined were mineral composition with X-ray diffraction (XRD), compressive mechanical strength, static modulus of elasticity, and mass loss after heating. The mineral composition of concretes with and without RHA replacement after heating was similar. Partial replacement of cement with RHA improved the mechanical performance with higher compressive strength up to a temperature of 400°C. The static modulus of elasticity degraded more sharply than mechanical strength due to dehydration of cementitious matrix and fissuring. No explosive spalling was observed for all temperatures tested, and the mass loss was similar for both concretes. This indicated no adverse effects in the partial replacement of portland cement with RHA from a mineral point of view.
ISSN:0899-1561
1943-5533
DOI:10.1061/(ASCE)MT.1943-5533.0004664