Intensified Pozzolanic Reaction on Kaolinite Clay-Based Mortar

The objective of this study is to develop and characterize kaolinite clay-based structural mortar. The pozzolanic reaction induced from two mineral additives, i.e., calcium hydroxide and silica fume (SF), and the physical filling effect from SF, were found to be effective on the enhancement of struc...

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Main Authors: Yang-Hee Kwon, Sung-Hoon Kang, Sung-Gul Hong, Juhyuk Moon
Format: Article
Language:English
Published: MDPI AG 2017-05-01
Series:Applied Sciences
Subjects:
Online Access:http://www.mdpi.com/2076-3417/7/5/522
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spelling doaj-20530b0b7d0e4d5d9b70efdb122c02b62020-11-24T21:44:29ZengMDPI AGApplied Sciences2076-34172017-05-017552210.3390/app7050522app7050522Intensified Pozzolanic Reaction on Kaolinite Clay-Based MortarYang-Hee Kwon0Sung-Hoon Kang1Sung-Gul Hong2Juhyuk Moon3Department of Architecture & Architectural Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, KoreaDepartment of Architecture & Architectural Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, KoreaDepartment of Architecture & Architectural Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, KoreaDepartment of Civil and Environmental Engineering, National University of Singapore, 1 Engineering Drive 2, Singapore 117576, SingaporeThe objective of this study is to develop and characterize kaolinite clay-based structural mortar. The pozzolanic reaction induced from two mineral additives, i.e., calcium hydroxide and silica fume (SF), and the physical filling effect from SF, were found to be effective on the enhancement of structural properties. Based on several preliminary experiments, 7:3 ratio of kaolinite clay/calcium hydroxide was selected as a basic binder. Then, the amount of SF was chosen as 0%, 7.5%, and 15% of the total binder to consider both the chemical and physical effects. The results showed that compressive strengths of samples with 7.5% and 15% SF are significantly increased by approximately 200% and 350%, respectively, at 28 days compared to the sample without SF. However, based on the results of the sample with 15% SF, it is found that excessive addition of SF causes long-term strength loss, possibly owing to micro cracks. With the careful consideration on this long-term behavior, this suggested new mix design can be further extended to develop sustainable structural materials using natural minerals or waste materials with nonbinding properties.http://www.mdpi.com/2076-3417/7/5/522cementless mortarsilica fumekaolinite claypozzolanic reactioncompressive strengthmicrostructure
collection DOAJ
language English
format Article
sources DOAJ
author Yang-Hee Kwon
Sung-Hoon Kang
Sung-Gul Hong
Juhyuk Moon
spellingShingle Yang-Hee Kwon
Sung-Hoon Kang
Sung-Gul Hong
Juhyuk Moon
Intensified Pozzolanic Reaction on Kaolinite Clay-Based Mortar
Applied Sciences
cementless mortar
silica fume
kaolinite clay
pozzolanic reaction
compressive strength
microstructure
author_facet Yang-Hee Kwon
Sung-Hoon Kang
Sung-Gul Hong
Juhyuk Moon
author_sort Yang-Hee Kwon
title Intensified Pozzolanic Reaction on Kaolinite Clay-Based Mortar
title_short Intensified Pozzolanic Reaction on Kaolinite Clay-Based Mortar
title_full Intensified Pozzolanic Reaction on Kaolinite Clay-Based Mortar
title_fullStr Intensified Pozzolanic Reaction on Kaolinite Clay-Based Mortar
title_full_unstemmed Intensified Pozzolanic Reaction on Kaolinite Clay-Based Mortar
title_sort intensified pozzolanic reaction on kaolinite clay-based mortar
publisher MDPI AG
series Applied Sciences
issn 2076-3417
publishDate 2017-05-01
description The objective of this study is to develop and characterize kaolinite clay-based structural mortar. The pozzolanic reaction induced from two mineral additives, i.e., calcium hydroxide and silica fume (SF), and the physical filling effect from SF, were found to be effective on the enhancement of structural properties. Based on several preliminary experiments, 7:3 ratio of kaolinite clay/calcium hydroxide was selected as a basic binder. Then, the amount of SF was chosen as 0%, 7.5%, and 15% of the total binder to consider both the chemical and physical effects. The results showed that compressive strengths of samples with 7.5% and 15% SF are significantly increased by approximately 200% and 350%, respectively, at 28 days compared to the sample without SF. However, based on the results of the sample with 15% SF, it is found that excessive addition of SF causes long-term strength loss, possibly owing to micro cracks. With the careful consideration on this long-term behavior, this suggested new mix design can be further extended to develop sustainable structural materials using natural minerals or waste materials with nonbinding properties.
topic cementless mortar
silica fume
kaolinite clay
pozzolanic reaction
compressive strength
microstructure
url http://www.mdpi.com/2076-3417/7/5/522
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AT sunghoonkang intensifiedpozzolanicreactiononkaoliniteclaybasedmortar
AT sunggulhong intensifiedpozzolanicreactiononkaoliniteclaybasedmortar
AT juhyukmoon intensifiedpozzolanicreactiononkaoliniteclaybasedmortar
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