Lightweight geopolymer made of highly porous siliceous materials with various Na2O/Al2O3 and SiO2/Al2O3 ratios

K. Pimraksa; P. Chindaprasirt; A. Rungchet; K. Sagoe-Crentsil; T. Sato

doi:10.1016/j.msea.2011.04.044

Lightweight geopolymer made of highly porous siliceous materials with various Na₂O/Al₂O₃ and SiO₂/Al₂O₃ ratios

K. Pimraksa, P. Chindaprasirt, A. Rungchet, K. Sagoe-Crentsil, T. Sato

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

99 Citations (Scopus)

Abstract

The syntheses of lightweight geopolymeric materials from highly porous siliceous materials viz. diatomaceous earth (DE) and rice husk ash (RHA) with high starting SiO₂/Al₂O₃ ratios of 13.0-33.5 and Na₂O/Al₂O₃ ratios of 0.66-3.0 were studied. The effects of fineness and calcination temperature of DE, concentrations of NaOH and KOH, DE to RHA ratio; curing temperature and time on the mechanical properties and microstructures of the geopolymer pastes were investigated. The results indicated that the optimum calcination temperature of DE was 800°C. Increasing fineness of DE and starting Na₂O/Al₂O₃ ratio resulted in an increase in compressive strength of geopolymer paste. Geopolymer pastes activated with NaOH gave higher compressive strengths than those with KOH. The optimum curing temperature and time were 75°C and 5days. The lightweight geopolymer material with mean bulk density of 0.88g/cm³ and compressive strength of 15kg/cm² was obtained. Incorporation of 40% RHA to increase starting SiO₂/Al₂O₃ and Na₂O/Al₂O₃ ratios to 22.5 and 1.7 and enhanced the compressive strength of geopolymer paste to 24kg/cm² with only a marginal increase of bulk density to 1.01g/cm³. However, the geopolymer materials with high Na₂O/Al₂O₃ (>1.5) were not stable in water submersion.

Original language	English
Pages (from-to)	6616-6623
Number of pages	8
Journal	Materials Science and Engineering A
Volume	528
Issue number	21
DOIs	https://doi.org/10.1016/j.msea.2011.04.044
Publication status	Published - 2011 Aug 15

Keywords

Diatomaceous earth
Glassy phase
Lightweight geopolymer
NaO/AlO ratio
Rice husk ash
SiO/AlO ratio

ASJC Scopus subject areas

Materials Science(all)
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering

Access to Document

10.1016/j.msea.2011.04.044

Cite this

@article{0c6460e8d333401481ff758f5ab28081,

title = "Lightweight geopolymer made of highly porous siliceous materials with various Na2O/Al2O3 and SiO2/Al2O3 ratios",

abstract = "The syntheses of lightweight geopolymeric materials from highly porous siliceous materials viz. diatomaceous earth (DE) and rice husk ash (RHA) with high starting SiO2/Al2O3 ratios of 13.0-33.5 and Na2O/Al2O3 ratios of 0.66-3.0 were studied. The effects of fineness and calcination temperature of DE, concentrations of NaOH and KOH, DE to RHA ratio; curing temperature and time on the mechanical properties and microstructures of the geopolymer pastes were investigated. The results indicated that the optimum calcination temperature of DE was 800°C. Increasing fineness of DE and starting Na2O/Al2O3 ratio resulted in an increase in compressive strength of geopolymer paste. Geopolymer pastes activated with NaOH gave higher compressive strengths than those with KOH. The optimum curing temperature and time were 75°C and 5days. The lightweight geopolymer material with mean bulk density of 0.88g/cm3 and compressive strength of 15kg/cm2 was obtained. Incorporation of 40% RHA to increase starting SiO2/Al2O3 and Na2O/Al2O3 ratios to 22.5 and 1.7 and enhanced the compressive strength of geopolymer paste to 24kg/cm2 with only a marginal increase of bulk density to 1.01g/cm3. However, the geopolymer materials with high Na2O/Al2O3 (>1.5) were not stable in water submersion.",

keywords = "Diatomaceous earth, Glassy phase, Lightweight geopolymer, NaO/AlO ratio, Rice husk ash, SiO/AlO ratio",

author = "K. Pimraksa and P. Chindaprasirt and A. Rungchet and K. Sagoe-Crentsil and T. Sato",

note = "Funding Information: Research fund given by Thailand Research Fund (TRF) ( MRG5180350 ) is gratefully acknowledged and we wish to thank also the National Research University Project under Thailand's Office of the Higher Education Commission for financial support.",

year = "2011",

month = aug,

day = "15",

doi = "10.1016/j.msea.2011.04.044",

language = "English",

volume = "528",

pages = "6616--6623",

journal = "Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing",

issn = "0921-5093",

publisher = "Elsevier BV",

number = "21",

}

TY - JOUR

T1 - Lightweight geopolymer made of highly porous siliceous materials with various Na2O/Al2O3 and SiO2/Al2O3 ratios

AU - Pimraksa, K.

AU - Chindaprasirt, P.

AU - Rungchet, A.

AU - Sagoe-Crentsil, K.

AU - Sato, T.

N1 - Funding Information: Research fund given by Thailand Research Fund (TRF) ( MRG5180350 ) is gratefully acknowledged and we wish to thank also the National Research University Project under Thailand's Office of the Higher Education Commission for financial support.

PY - 2011/8/15

Y1 - 2011/8/15

N2 - The syntheses of lightweight geopolymeric materials from highly porous siliceous materials viz. diatomaceous earth (DE) and rice husk ash (RHA) with high starting SiO2/Al2O3 ratios of 13.0-33.5 and Na2O/Al2O3 ratios of 0.66-3.0 were studied. The effects of fineness and calcination temperature of DE, concentrations of NaOH and KOH, DE to RHA ratio; curing temperature and time on the mechanical properties and microstructures of the geopolymer pastes were investigated. The results indicated that the optimum calcination temperature of DE was 800°C. Increasing fineness of DE and starting Na2O/Al2O3 ratio resulted in an increase in compressive strength of geopolymer paste. Geopolymer pastes activated with NaOH gave higher compressive strengths than those with KOH. The optimum curing temperature and time were 75°C and 5days. The lightweight geopolymer material with mean bulk density of 0.88g/cm3 and compressive strength of 15kg/cm2 was obtained. Incorporation of 40% RHA to increase starting SiO2/Al2O3 and Na2O/Al2O3 ratios to 22.5 and 1.7 and enhanced the compressive strength of geopolymer paste to 24kg/cm2 with only a marginal increase of bulk density to 1.01g/cm3. However, the geopolymer materials with high Na2O/Al2O3 (>1.5) were not stable in water submersion.

AB - The syntheses of lightweight geopolymeric materials from highly porous siliceous materials viz. diatomaceous earth (DE) and rice husk ash (RHA) with high starting SiO2/Al2O3 ratios of 13.0-33.5 and Na2O/Al2O3 ratios of 0.66-3.0 were studied. The effects of fineness and calcination temperature of DE, concentrations of NaOH and KOH, DE to RHA ratio; curing temperature and time on the mechanical properties and microstructures of the geopolymer pastes were investigated. The results indicated that the optimum calcination temperature of DE was 800°C. Increasing fineness of DE and starting Na2O/Al2O3 ratio resulted in an increase in compressive strength of geopolymer paste. Geopolymer pastes activated with NaOH gave higher compressive strengths than those with KOH. The optimum curing temperature and time were 75°C and 5days. The lightweight geopolymer material with mean bulk density of 0.88g/cm3 and compressive strength of 15kg/cm2 was obtained. Incorporation of 40% RHA to increase starting SiO2/Al2O3 and Na2O/Al2O3 ratios to 22.5 and 1.7 and enhanced the compressive strength of geopolymer paste to 24kg/cm2 with only a marginal increase of bulk density to 1.01g/cm3. However, the geopolymer materials with high Na2O/Al2O3 (>1.5) were not stable in water submersion.

KW - Diatomaceous earth

KW - Glassy phase

KW - Lightweight geopolymer

KW - NaO/AlO ratio

KW - Rice husk ash

KW - SiO/AlO ratio

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U2 - 10.1016/j.msea.2011.04.044

DO - 10.1016/j.msea.2011.04.044

M3 - Article

AN - SCOPUS:80955179488

VL - 528

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EP - 6623

JO - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing

JF - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing

SN - 0921-5093

IS - 21

ER -