Strength and microstructure of alkali-activated natural pozzolan and limestone powder mortar

A. A. Adewumi; M. Ismail; M. A.M. Ariffin; M. O. Yusuf; M. Maslehuddin; H. D. Mohamed

doi:10.18720/MCE.92.3

Strength and microstructure of alkali-activated natural pozzolan and limestone powder mortar

A. A. Adewumi
, M. Ismail^*
, M. A.M. Ariffin
, M. O. Yusuf
, M. Maslehuddin
, H. D. Mohamed

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

19 Scopus citations

Abstract

In this study, the synergistic effects of natural pozzolan (NP) and limestone powder waste (LSPW) alkaline activated mortar has been investigated using compressive strength and microstructure analysis. LSPW was added in varying percentages to alkaline activated NP such that the combined ratio (LSPW/(LSPW + NP)) varied from (0 to 1) at the interval of 0.2. The activators used were sodium silicate (Na₂SiO_3(aq)) and sodium hydroxide (10M NaOH_(aq)) combined as 1:1. The findings revealed that the synergistic effect of NP with LSPW emanated from silica and alumina required for the formation of aluminosilicate framework which required cation sourced from LSPW (Ca²⁺) for charge balancing in the formed skeletal framework. The products formed were mainly anorthite (CaAl₂Si₂O₈) and gehlenite (CaO.Al₂O₃.SiO₂). Besides, about 77 % of 28-days compressive strength (27 MPa) could be achieved in 24 h using heat curing. Microstructural analysis revealed that the rough texture of activated NP characterized with high porosity turned to be filled up by the presence of LSPW thereby improving the microstructural density.

Original language	English
Pages (from-to)	36-47
Number of pages	12
Journal	Magazine of Civil Engineering
Volume	92
Issue number	8
DOIs	https://doi.org/10.18720/MCE.92.3
State	Published - Dec 2019

Bibliographical note

Publisher Copyright:
© Adewumi, A.A., Ismail, M., Ariffin, M.A.M., Yusuf, M.O., Maslehuddin, M., Mohamed, H.D., 2019.

Keywords

Alkali-activated mortar
Aluminosilicate
Compressive strength
Limestone powder
Microstructure
Natural pozzolan

ASJC Scopus subject areas

Civil and Structural Engineering
Building and Construction

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10.18720/MCE.92.3

Cite this

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title = "Strength and microstructure of alkali-activated natural pozzolan and limestone powder mortar",

abstract = "In this study, the synergistic effects of natural pozzolan (NP) and limestone powder waste (LSPW) alkaline activated mortar has been investigated using compressive strength and microstructure analysis. LSPW was added in varying percentages to alkaline activated NP such that the combined ratio (LSPW/(LSPW + NP)) varied from (0 to 1) at the interval of 0.2. The activators used were sodium silicate (Na2SiO3(aq)) and sodium hydroxide (10M NaOH(aq)) combined as 1:1. The findings revealed that the synergistic effect of NP with LSPW emanated from silica and alumina required for the formation of aluminosilicate framework which required cation sourced from LSPW (Ca2+) for charge balancing in the formed skeletal framework. The products formed were mainly anorthite (CaAl2Si2O8) and gehlenite (CaO.Al2O3.SiO2). Besides, about 77 \% of 28-days compressive strength (27 MPa) could be achieved in 24 h using heat curing. Microstructural analysis revealed that the rough texture of activated NP characterized with high porosity turned to be filled up by the presence of LSPW thereby improving the microstructural density.",

keywords = "Alkali-activated mortar, Aluminosilicate, Compressive strength, Limestone powder, Microstructure, Natural pozzolan",

author = "Adewumi, \{A. A.\} and M. Ismail and Ariffin, \{M. A.M.\} and Yusuf, \{M. O.\} and M. Maslehuddin and Mohamed, \{H. D.\}",

note = "Publisher Copyright: {\textcopyright} Adewumi, A.A., Ismail, M., Ariffin, M.A.M., Yusuf, M.O., Maslehuddin, M., Mohamed, H.D., 2019.",

year = "2019",

month = dec,

doi = "10.18720/MCE.92.3",

language = "English",

volume = "92",

pages = "36--47",

journal = "Magazine of Civil Engineering",

issn = "2071-4726",

publisher = "St. Petersburg Polytechnic University of Peter the Great",

number = "8",

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T1 - Strength and microstructure of alkali-activated natural pozzolan and limestone powder mortar

AU - Adewumi, A. A.

AU - Ismail, M.

AU - Ariffin, M. A.M.

AU - Yusuf, M. O.

AU - Maslehuddin, M.

AU - Mohamed, H. D.

N1 - Publisher Copyright: © Adewumi, A.A., Ismail, M., Ariffin, M.A.M., Yusuf, M.O., Maslehuddin, M., Mohamed, H.D., 2019.

PY - 2019/12

Y1 - 2019/12

N2 - In this study, the synergistic effects of natural pozzolan (NP) and limestone powder waste (LSPW) alkaline activated mortar has been investigated using compressive strength and microstructure analysis. LSPW was added in varying percentages to alkaline activated NP such that the combined ratio (LSPW/(LSPW + NP)) varied from (0 to 1) at the interval of 0.2. The activators used were sodium silicate (Na2SiO3(aq)) and sodium hydroxide (10M NaOH(aq)) combined as 1:1. The findings revealed that the synergistic effect of NP with LSPW emanated from silica and alumina required for the formation of aluminosilicate framework which required cation sourced from LSPW (Ca2+) for charge balancing in the formed skeletal framework. The products formed were mainly anorthite (CaAl2Si2O8) and gehlenite (CaO.Al2O3.SiO2). Besides, about 77 % of 28-days compressive strength (27 MPa) could be achieved in 24 h using heat curing. Microstructural analysis revealed that the rough texture of activated NP characterized with high porosity turned to be filled up by the presence of LSPW thereby improving the microstructural density.

AB - In this study, the synergistic effects of natural pozzolan (NP) and limestone powder waste (LSPW) alkaline activated mortar has been investigated using compressive strength and microstructure analysis. LSPW was added in varying percentages to alkaline activated NP such that the combined ratio (LSPW/(LSPW + NP)) varied from (0 to 1) at the interval of 0.2. The activators used were sodium silicate (Na2SiO3(aq)) and sodium hydroxide (10M NaOH(aq)) combined as 1:1. The findings revealed that the synergistic effect of NP with LSPW emanated from silica and alumina required for the formation of aluminosilicate framework which required cation sourced from LSPW (Ca2+) for charge balancing in the formed skeletal framework. The products formed were mainly anorthite (CaAl2Si2O8) and gehlenite (CaO.Al2O3.SiO2). Besides, about 77 % of 28-days compressive strength (27 MPa) could be achieved in 24 h using heat curing. Microstructural analysis revealed that the rough texture of activated NP characterized with high porosity turned to be filled up by the presence of LSPW thereby improving the microstructural density.

KW - Alkali-activated mortar

KW - Aluminosilicate

KW - Compressive strength

KW - Limestone powder

KW - Microstructure

KW - Natural pozzolan

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DO - 10.18720/MCE.92.3

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SN - 2071-4726

VL - 92

SP - 36

EP - 47

JO - Magazine of Civil Engineering

JF - Magazine of Civil Engineering

IS - 8

ER -

Strength and microstructure of alkali-activated natural pozzolan and limestone powder mortar

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

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