Effect of Rice Husk Ash as Supplementary Cementitious Material on the Performance of Cement-Based Pastes Continuously Exposed to Organic Acid Solution (Vinasse)

AbstractIn the present study, rice husk ash (RHA) was evaluated as supplementary cementitious material in portland cement pastes subjected to acid attack from vinasse, an acid residue from ethanol production. RHA and quartz (inert) were used in amounts of 10% and 20% in cement pastes. Mass loss vari...

Full description

Saved in:
Bibliographic Details
Published in:Journal of materials in civil engineering 2019-07, Vol.31 (7)
Main Authors: Castillo Lara, Rancés, Chagas Cordeiro, Guilherme
Format: Article
Language:English
Subjects:
Ashes
Building materials
Calcium
Cement
Cement paste
Chemical attack
Civil engineering
Compressive strength
Differential thermal analysis
Differential thermogravimetric analysis
Ethanol
Exposure
Mechanical properties
Mineralogy
Organic chemistry
Portland cements
Qualitative analysis
Surface roughness
Technical Papers
Thermogravimetric analysis
Thermogravimetry
Vinasse
X-ray diffraction
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:AbstractIn the present study, rice husk ash (RHA) was evaluated as supplementary cementitious material in portland cement pastes subjected to acid attack from vinasse, an acid residue from ethanol production. RHA and quartz (inert) were used in amounts of 10% and 20% in cement pastes. Mass loss variation, surface roughness, degradation-front progression, compressive strength, portlandite content, and mineralogical changes of the pastes were evaluated during 3 months of continuous exposure. In general, physical and mechanical properties were seriously affected for all pastes, except for the mix containing 20% RHA. The use of RHA did not cause a considerable change in the mineralogical composition of the pastes, being quite similar to that in the reference (Ca-bearing phases). As a consequence, chemical resistance of all pastes showed similar behavior in terms of mineralogical assemblage after exposure in vinasse, according to thermogravimetric analysis (TGA) and differential thermogravimetry (DTG) results and a qualitative analysis of X-ray diffraction (XRD) results, since the aggressiveness of the attack by the weak acids present in the vinasse is strongly related to the solubility of their calcium salts.
ISSN:0899-1561
1943-5533
DOI:10.1061/(ASCE)MT.1943-5533.0002739