Developmental study of a low-pH magnesium phosphate cement for environmental applications

Srinath Iyengar, Abir Al-Tabbaa

Research output: Contribution to journalArticle

25 Citations (Scopus)

Abstract

This paper presents a laboratory investigation into the development of a low-pH magnesium phosphate-based cement for use in in-situ stabilisation/ solidification systems, as a more effective alternative to Portland cement. The idea is to develop a cement-based binder with a low enough pH to facilitate biodegradation in combination with stabilisation/ solidification processes. Potassium dihydrogen orthophosphate was selected as the phosphate source, dead-burned magnesia as the magnesium source and boric acid as the retarder. The range of mixes were tested primarily on their pH development which was found to be in the range of 6-9.5 for a magnesia to phosphate ratio range of 1:1 to 1:5. The testing revealed a dense microstructure, high early-age strength development and low volume expansion of the developed cement. Observed fracturing of some of the cured cement samples has been related to the curing conditions and the impurities present in the magnesia. On the basis of microstructural examination, observed white crystalline deposits on cured samples are likely to be a reaction product of magnesia and potassium dihydrogen phosphate.

Original languageEnglish
Pages (from-to)1387-1401
Number of pages15
JournalEnvironmental Technology
Volume28
Issue number12
DOIs
Publication statusPublished - 1 Dec 2007
Externally publishedYes

Fingerprint

Magnesium Oxide
magnesium
Cements
cement
phosphate
Phosphates
Solidification
solidification
Stabilization
stabilization
potassium
Portland cement
Biodegradation
Reaction products
Magnesium
Binders
orthophosphate
Curing
Potassium
Deposits

Keywords

  • Chemically bonded ceramics
  • Low pH cement
  • Magnesium phosphate cements
  • Waste management

ASJC Scopus subject areas

  • Environmental Chemistry
  • Water Science and Technology
  • Waste Management and Disposal

Cite this

Developmental study of a low-pH magnesium phosphate cement for environmental applications. / Iyengar, Srinath; Al-Tabbaa, Abir.

In: Environmental Technology, Vol. 28, No. 12, 01.12.2007, p. 1387-1401.

Research output: Contribution to journalArticle

@article{72017f09bd9443fdaae89aa9c0f4f4fe,
title = "Developmental study of a low-pH magnesium phosphate cement for environmental applications",
abstract = "This paper presents a laboratory investigation into the development of a low-pH magnesium phosphate-based cement for use in in-situ stabilisation/ solidification systems, as a more effective alternative to Portland cement. The idea is to develop a cement-based binder with a low enough pH to facilitate biodegradation in combination with stabilisation/ solidification processes. Potassium dihydrogen orthophosphate was selected as the phosphate source, dead-burned magnesia as the magnesium source and boric acid as the retarder. The range of mixes were tested primarily on their pH development which was found to be in the range of 6-9.5 for a magnesia to phosphate ratio range of 1:1 to 1:5. The testing revealed a dense microstructure, high early-age strength development and low volume expansion of the developed cement. Observed fracturing of some of the cured cement samples has been related to the curing conditions and the impurities present in the magnesia. On the basis of microstructural examination, observed white crystalline deposits on cured samples are likely to be a reaction product of magnesia and potassium dihydrogen phosphate.",
keywords = "Chemically bonded ceramics, Low pH cement, Magnesium phosphate cements, Waste management",
author = "Srinath Iyengar and Abir Al-Tabbaa",
year = "2007",
month = "12",
day = "1",
doi = "10.1080/09593332808618899",
language = "English",
volume = "28",
pages = "1387--1401",
journal = "Environmental Technology (United Kingdom)",
issn = "0959-3330",
publisher = "Taylor and Francis Ltd.",
number = "12",

}

TY - JOUR

T1 - Developmental study of a low-pH magnesium phosphate cement for environmental applications

AU - Iyengar, Srinath

AU - Al-Tabbaa, Abir

PY - 2007/12/1

Y1 - 2007/12/1

N2 - This paper presents a laboratory investigation into the development of a low-pH magnesium phosphate-based cement for use in in-situ stabilisation/ solidification systems, as a more effective alternative to Portland cement. The idea is to develop a cement-based binder with a low enough pH to facilitate biodegradation in combination with stabilisation/ solidification processes. Potassium dihydrogen orthophosphate was selected as the phosphate source, dead-burned magnesia as the magnesium source and boric acid as the retarder. The range of mixes were tested primarily on their pH development which was found to be in the range of 6-9.5 for a magnesia to phosphate ratio range of 1:1 to 1:5. The testing revealed a dense microstructure, high early-age strength development and low volume expansion of the developed cement. Observed fracturing of some of the cured cement samples has been related to the curing conditions and the impurities present in the magnesia. On the basis of microstructural examination, observed white crystalline deposits on cured samples are likely to be a reaction product of magnesia and potassium dihydrogen phosphate.

AB - This paper presents a laboratory investigation into the development of a low-pH magnesium phosphate-based cement for use in in-situ stabilisation/ solidification systems, as a more effective alternative to Portland cement. The idea is to develop a cement-based binder with a low enough pH to facilitate biodegradation in combination with stabilisation/ solidification processes. Potassium dihydrogen orthophosphate was selected as the phosphate source, dead-burned magnesia as the magnesium source and boric acid as the retarder. The range of mixes were tested primarily on their pH development which was found to be in the range of 6-9.5 for a magnesia to phosphate ratio range of 1:1 to 1:5. The testing revealed a dense microstructure, high early-age strength development and low volume expansion of the developed cement. Observed fracturing of some of the cured cement samples has been related to the curing conditions and the impurities present in the magnesia. On the basis of microstructural examination, observed white crystalline deposits on cured samples are likely to be a reaction product of magnesia and potassium dihydrogen phosphate.

KW - Chemically bonded ceramics

KW - Low pH cement

KW - Magnesium phosphate cements

KW - Waste management

UR - http://www.scopus.com/inward/record.url?scp=39149145191&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=39149145191&partnerID=8YFLogxK

U2 - 10.1080/09593332808618899

DO - 10.1080/09593332808618899

M3 - Article

C2 - 18341149

AN - SCOPUS:39149145191

VL - 28

SP - 1387

EP - 1401

JO - Environmental Technology (United Kingdom)

JF - Environmental Technology (United Kingdom)

SN - 0959-3330

IS - 12

ER -