A comparative study on retarders for magnesium phosphate cements

Adu-Amankwah Sam; Tracy Ajambo; Tianyijia Chen; Pengkun Hou

A comparative study on retarders for magnesium phosphate cements

Adu-Amankwah Sam
, Tracy Ajambo
, Tianyijia Chen
, Pengkun Hou

Research output: Chapter in Book/Published conference output › Conference publication

Abstract

Magnesium potassium phosphate cements (MKPC) are chemically bonded ceramics with potential biomedical, construction and nuclear waste management applications. These are formed from acid-base reaction between magnesium oxide and hydrogen phosphate source, leading to struvite (-K) as the main reaction product. The dissolution and precipitation reactions occur rapidly, generating significant heat and causing fast setting. Routinely, boric acid, a reproductive toxin is added to control the reaction of MKPC. This study investigated the activity of citric acid as alternative retarder. MKPCs with MgO/PO4 molar ratio of 4 and 0.5 w/s ratio with or without 2.5% boric or citric acid by weight of solids were investigated by isothermal calorimetry, XRD, and SEM. The results demonstrate effectiveness of citric acid in modifying reaction kinetics and MKPC microstructure. This is significant for safe production of MKPC.

Original language	English
Title of host publication	Advances in Applied Ceramics
Publisher	Taylor & Francis
Number of pages	3
Publication status	Published - 12 Sept 2022
Event	41st Cement & Concrete Science Conference - Leeds, United Kingdom Duration: 12 Sept 2022 → 13 Sept 2022 https://www.iom3.org/events-awards/events-archive/41st-cement-and-concrete-science-conference/registration-information.html

Conference

Conference	41st Cement & Concrete Science Conference
Country/Territory	United Kingdom
City	Leeds
Period	12/09/22 → 13/09/22
Internet address	https://www.iom3.org/events-awards/events-archive/41st-cement-and-concrete-science-conference/registration-information.html

Bibliographical note

EPSRC (Engineering and Physical Sciences Research Council) R/167260

Cite this

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title = "A comparative study on retarders for magnesium phosphate cements",

abstract = "Magnesium potassium phosphate cements (MKPC) are chemically bonded ceramics with potential biomedical, construction and nuclear waste management applications. These are formed from acid-base reaction between magnesium oxide and hydrogen phosphate source, leading to struvite (-K) as the main reaction product. The dissolution and precipitation reactions occur rapidly, generating significant heat and causing fast setting. Routinely, boric acid, a reproductive toxin is added to control the reaction of MKPC. This study investigated the activity of citric acid as alternative retarder. MKPCs with MgO/PO4 molar ratio of 4 and 0.5 w/s ratio with or without 2.5\% boric or citric acid by weight of solids were investigated by isothermal calorimetry, XRD, and SEM. The results demonstrate effectiveness of citric acid in modifying reaction kinetics and MKPC microstructure. This is significant for safe production of MKPC.",

author = "Adu-Amankwah Sam and Tracy Ajambo and Tianyijia Chen and Pengkun Hou",

note = "EPSRC (Engineering and Physical Sciences Research Council) R/167260; 41st Cement \& Concrete Science Conference ; Conference date: 12-09-2022 Through 13-09-2022",

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day = "12",

language = "English",

booktitle = "Advances in Applied Ceramics",

publisher = "Taylor \& Francis",

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TY - GEN

T1 - A comparative study on retarders for magnesium phosphate cements

AU - Sam, Adu-Amankwah

AU - Ajambo, Tracy

AU - Chen, Tianyijia

AU - Hou, Pengkun

N1 - EPSRC (Engineering and Physical Sciences Research Council) R/167260

PY - 2022/9/12

Y1 - 2022/9/12

N2 - Magnesium potassium phosphate cements (MKPC) are chemically bonded ceramics with potential biomedical, construction and nuclear waste management applications. These are formed from acid-base reaction between magnesium oxide and hydrogen phosphate source, leading to struvite (-K) as the main reaction product. The dissolution and precipitation reactions occur rapidly, generating significant heat and causing fast setting. Routinely, boric acid, a reproductive toxin is added to control the reaction of MKPC. This study investigated the activity of citric acid as alternative retarder. MKPCs with MgO/PO4 molar ratio of 4 and 0.5 w/s ratio with or without 2.5% boric or citric acid by weight of solids were investigated by isothermal calorimetry, XRD, and SEM. The results demonstrate effectiveness of citric acid in modifying reaction kinetics and MKPC microstructure. This is significant for safe production of MKPC.

AB - Magnesium potassium phosphate cements (MKPC) are chemically bonded ceramics with potential biomedical, construction and nuclear waste management applications. These are formed from acid-base reaction between magnesium oxide and hydrogen phosphate source, leading to struvite (-K) as the main reaction product. The dissolution and precipitation reactions occur rapidly, generating significant heat and causing fast setting. Routinely, boric acid, a reproductive toxin is added to control the reaction of MKPC. This study investigated the activity of citric acid as alternative retarder. MKPCs with MgO/PO4 molar ratio of 4 and 0.5 w/s ratio with or without 2.5% boric or citric acid by weight of solids were investigated by isothermal calorimetry, XRD, and SEM. The results demonstrate effectiveness of citric acid in modifying reaction kinetics and MKPC microstructure. This is significant for safe production of MKPC.

UR - https://eprints.whiterose.ac.uk/191110/

M3 - Conference publication

BT - Advances in Applied Ceramics

PB - Taylor & Francis

T2 - 41st Cement & Concrete Science Conference

Y2 - 12 September 2022 through 13 September 2022

ER -

A comparative study on retarders for magnesium phosphate cements

Abstract

Conference

Bibliographical note

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