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Open AccessArticle

Hydrochloric Acid Pretreatment of Different Types of Rice Husk Ash Influence on the Properties of Cement Paste

by Jing Liu 1, Chunyan Xie 1, Chao Fu 1, Xiuli Wei 2 and Dake Wu 1,*
1
College of Engineering and Technology, Southwest University, Chongqing 400715, China
2
Chongqing Academy of Agricultural Sciences, Chongqing 401329, China
*
Author to whom correspondence should be addressed.
Materials 2020, 13(7), 1524; https://doi.org/10.3390/ma13071524
Received: 5 March 2020 / Revised: 18 March 2020 / Accepted: 23 March 2020 / Published: 26 March 2020
When properly processed, rice husk ash (RHA) comprises a large amount of SiO2, which exhibits a high pozzolanic activity and acts as a good building filler. In this paper, the effects of rice husk ash content, acid pretreatment, and production regions on the compressive and flexural properties and water absorption of a cement paste were studied. The experimental results showed that the compressive strength of the rice husk ash was the highest with a 10% content level, which was about 16.22% higher than that of the control sample. The rice husk after acid pretreatment displayed a higher strength than that of the sample without the acid treatment, and the rice husk from the Inner Mongolia region indicated a higher strength than that from the Guangdong province. However, the flexural strength of each group was not significantly different from that of the blank control group. The trend observed for the water absorption was similar to that of the compressive strength. The variation in the RHA proportions had the greatest influence on the properties of the paste specimens, followed by the acid pretreatments of the rice husks. The production regions of the rice husks indicated the least influence. View Full-Text
Keywords: rice husk ash; amount percent; acid treatment; cement paste; compressive strength rice husk ash; amount percent; acid treatment; cement paste; compressive strength
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Liu, J.; Xie, C.; Fu, C.; Wei, X.; Wu, D. Hydrochloric Acid Pretreatment of Different Types of Rice Husk Ash Influence on the Properties of Cement Paste. Materials 2020, 13, 1524.

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