Brant Walkley
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View article: Reaction mechanisms and kinetics in geopolymers incorporating strontium salts
Reaction mechanisms and kinetics in geopolymers incorporating strontium salts Open
Strontium salts reduce the rate and extent of reaction of geopolymers due to (1) reduced metakaolin dissolution due to lower pH and sorption of Sr 2+ to metakaolin surfaces, and (2) a ‘filler effect’ arising from insoluble strontium salt p…
View article: Effects of kaolinite and montmorillonite calcined clays on the sulfate balance, early hydration, and artificial pore solution of limestone calcined clay cements (LC3)
Effects of kaolinite and montmorillonite calcined clays on the sulfate balance, early hydration, and artificial pore solution of limestone calcined clay cements (LC3) Open
This study investigated the physicochemical effects of kaolinite (CK) and montmorillonite (CM) calcined clays on the sulfate balance, early hydration, and artificial pore solution of limestone calcined clay cement (LC 3 ). The effects of f…
View article: Multi-year cementitious hydrate product formation in non-Portland high performance concretes
Multi-year cementitious hydrate product formation in non-Portland high performance concretes Open
This paper describes the hydration products and microstructural formation processes that yield excellent mechanical properties in “zero-cement concretes” (ZCC) produced by chemical activation of a blend of silica fume, blast furnace slag, …
View article: Aqueous cold-sintering of Na0.7CoO2: A benign, facile method for the densification of Na-ion compounds
Aqueous cold-sintering of Na0.7CoO2: A benign, facile method for the densification of Na-ion compounds Open
The properties of the hexagonal P2 sodium cobaltate, Na0.7CoO2 (NCO) phase densified using the conventional and cold sintering methods were investigated, and we demonstrated that the cold sintering method yields NCO with a relative density…
View article: Basic oxygen furnace (BOF) slag as an additive in sodium carbonate-activated slag cements
Basic oxygen furnace (BOF) slag as an additive in sodium carbonate-activated slag cements Open
Basic oxygen furnace slag (BOFS) is a high-volume waste resulting from the production of steel from pig iron. Due to its high free lime content, BOFS is difficult to recycle and/or include into conventional cement systems. Alkali-activatio…
View article: Determining aluminium co-ordination of kaolinitic clays before and after calcination with electron energy loss spectroscopy
Determining aluminium co-ordination of kaolinitic clays before and after calcination with electron energy loss spectroscopy Open
Developing a greater understanding of kaolinite dehydroxylation upon calcination is crucial for several industrial applications, including cements. Aluminium coordination in meta-kaolinite indicates the extent of its dehydroxylation and it…
View article: Determining aluminium co-ordination of kaolinitic clays before and after calcination with electron energy loss spectroscopy
Determining aluminium co-ordination of kaolinitic clays before and after calcination with electron energy loss spectroscopy Open
Developing a greater understanding of kaolinite dehydroxylation upon calcination is crucial for several industrial applications, including cements. Aluminium coordination in meta-kaolinite indicates the extent of its dehydroxylation and it…
View article: Encapsulation of iodine-loaded adsorbents in blended Portland cement and geopolymer wasteforms
Encapsulation of iodine-loaded adsorbents in blended Portland cement and geopolymer wasteforms Open
Capture of radioiodine by solid adsorbents and subsequent cementation is a promising solution to achieve "Near Zero" emissions from nuclear fuel cycles. We investigate cementation of iodine-loaded silica adsorbents in blast furnace slag bl…
View article: Effect of exposure of metakaolin‐based geopolymer cements to gamma radiation
Effect of exposure of metakaolin‐based geopolymer cements to gamma radiation Open
The stability of cementitious materials under the harsh environment they will experience when used for radioactive waste disposal is incredibly important. Therefore, understanding the irradiation resistance of geopolymer cement, a potentia…
View article: Effects of kaolinite and montmorillonite calcined clays on the sulfate balance, early hydration, and artificial pore solution of limestone calcined clay cements (LC3)
Effects of kaolinite and montmorillonite calcined clays on the sulfate balance, early hydration, and artificial pore solution of limestone calcined clay cements (LC3) Open
This study investigated the physicochemical effects of kaolinite (CK) and montmorillonite (CM) calcined clays on the sulfate balance, early hydration, and artificial pore solution of limestone calcined clay cement (LC3). The effects of fin…
View article: Mineralogical characteristics influence the structure and pozzolanic reactivity of thermally and mechano-chemically activated meta-kaolinites
Mineralogical characteristics influence the structure and pozzolanic reactivity of thermally and mechano-chemically activated meta-kaolinites Open
Mechano-chemical activation enhances early age (<12 hours) pozzolanic reactivity of clays by transforming kaolinite to meta-kaolinite, reducing particle size, and potentially increasing the edge : basal surface area ratio of meta-kaolinite.
View article: Effect of ZrO2 stoichiometry on the structural and electrical properties of Na3Zr2−xSi2PO12-2x solid electrolyte
Effect of ZrO2 stoichiometry on the structural and electrical properties of Na3Zr2−xSi2PO12-2x solid electrolyte Open
Na3Zr2Si2P2O12 (NZSP) has potential use as a solid electrolyte in Na-ion solid-state batteries due to its high ionic conductivity (10-3–10-4 Scm-1) at room temperature. It is established that all previous preparations involving the solid-s…
View article: Characterisation of calcined waste clays from kaolinite extraction in alkali-activated GGBFS blends
Characterisation of calcined waste clays from kaolinite extraction in alkali-activated GGBFS blends Open
Metakaolin is a well-studied supplementary cementitious material (SCM) and precursor in alkali-activation. The utilisation of limited kaolinite content clays generated from large-scale industrial activity, denoted as waste clays, in alkali…
View article: Reaction mechanisms, kinetics, and nanostructural evolution of magnesium silicate hydrate (M-S-H) gels
Reaction mechanisms, kinetics, and nanostructural evolution of magnesium silicate hydrate (M-S-H) gels Open
M-S-H gels were synthesised via reaction of Mg(OH)2 with silica fume, cured at 35 °C for up to 112 days, and their chemical and nanostructural evolution was examined. M-S-H gels with structural similarity to the thermodynamically stable se…
View article: Investigating the retarding effect of CAC in alkali-activated cements
Investigating the retarding effect of CAC in alkali-activated cements Open
This paper discusses the design of hybrid alkali-activated binders at ambient temperature, specifically the development of mixes based on ground granulated blast-furnace slag (GGBFS) with calcium aluminate cement (CAC) as an additive, aimi…
View article: Optimization of Magnesium Potassium Phosphate Cements Using Ultrafine Fly Ash and Fly Ash
Optimization of Magnesium Potassium Phosphate Cements Using Ultrafine Fly Ash and Fly Ash Open
The effect of ultrafine fly ash (UFA) and fly ash (FA) on the physical properties, phase assemblage, and microstructure of magnesium potassium phosphate cement (MKPC) was investigated. This study revealed that the UFA addition does not aff…