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Toshifumi Sugama

Bio: Toshifumi Sugama is an academic researcher from Brookhaven National Laboratory. The author has contributed to research in topics: Cement & Aluminate. The author has an hindex of 22, co-authored 116 publications receiving 1670 citations.
Topics: Cement, Aluminate, Zinc phosphate, Corrosion, Coating


Papers
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Journal ArticleDOI
TL;DR: In this paper, Magnesium monophosphate cementitious materials were prepared by mixing calcined magnesium oxide (MgO) powder with an aqueous solution of diammonium phosphate (ADP) at 24°C The activation energy for the curing reaction of the cement paste was determined to be 3029 kcal/mole, and at age 1 hr the compressive strength was ≈900 psi (62 MPa).

121 citations

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TL;DR: The use of 20% borax by weight of ammonium polyphosphate (AmPP) has been shown to increase the reaction time to 20 min, compared with a reaction time of <3 min for specimens without boredax as mentioned in this paper.

86 citations

Journal ArticleDOI
TL;DR: In an attempt to better understand interactions occuring at hydrated cement/organic polymer interfaces, the reaction mechanism and products formed at the interfaces between poly(acrylic acid), p(AA) or poly(ACrylamide), poly(AM), and Ca(OH)2 or gibbsite, Al2O3·3H2O, were explored using x-ray photoelectron spectroscopy (XPS) as mentioned in this paper.

68 citations

Journal ArticleDOI
TL;DR: In this paper, a water-insoluble chitosan (CS) biopolymer was applied as environmentally benign water-based coatings to an aluminum (Al) substrate by a simple dip-withdrawing method, and the following three factors played an essential role in mitigating the rate of corrosion of the Al: first was the polymer's conformation containing hydrophobic amide bonds, together with a minimal amount of hydrophilic unreacted COOH in PIA and NH2 in CS.

67 citations

Journal ArticleDOI
TL;DR: In this paper, SFCB-modified fly ash/calcium aluminate blend (SFCB) cements were prepared by autoclaving for 1 day at 300 C and their resistance was evaluated in a highly concentrated Na{sub 2}CO{sub 3} solution at 300C.

63 citations


Cited by
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Journal ArticleDOI
TL;DR: In this paper, a review of the role played by biological calcium phosphates in bone regeneration is presented, where the synthesis procedures to obtain in the laboratory calcium deficient carbonate nanoapatite both in bulk and thin film forms, as well as the characterization methods applied to these materials are described.

1,014 citations

Journal ArticleDOI
TL;DR: In this paper, a fly ash-based geopolymer concrete for curing in ambient condition can be proportioned for desirable workability, setting time, and compressive strength using ground granulated blast-furnace slag (GGBFS) as a small part of the binder.

855 citations

Journal ArticleDOI
TL;DR: In this article, a review of the current status of technology deployment and recommendations for future remediation research is presented. And the authors also elucidate and compare the available technologies that are currently being applied for remediation of heavy metal(loid) contaminated soils, as well as the economic aspect of soil remediation for different techniques.

792 citations

Journal ArticleDOI
TL;DR: A comprehensive view of the field of stimuli-responsive healable materials can be found in this article, with particular emphasis on work published in the past two years, focusing on polymeric materials.

621 citations

Journal ArticleDOI
TL;DR: In uses that do not require steel reinforcement, and in locations where the MgO can be sourced at a competitive price, a detailed understanding of these systems enables their specification, design, and selection as advanced engineering materials with a strongly defined chemical basis.
Abstract: This review examines the detailed chemical insights that have been generated through 150 years of work worldwide on magnesium-based inorganic cements, with a focus on both scientific and patent literature. Magnesium carbonate, phosphate, silicate-hydrate, and oxysalt (both chloride and sulfate) cements are all assessed. Many such cements are ideally suited to specialist applications in precast construction, road repair, and other fields including nuclear waste immobilization. The majority of MgO-based cements are more costly to produce than Portland cement because of the relatively high cost of reactive sources of MgO and do not have a sufficiently high internal pH to passivate mild steel reinforcing bars. This precludes MgO-based cements from providing a large-scale replacement for Portland cement in the production of steel-reinforced concretes for civil engineering applications, despite the potential for CO2 emissions reductions offered by some such systems. Nonetheless, in uses that do not require steel reinforcement, and in locations where the MgO can be sourced at a competitive price, a detailed understanding of these systems enables their specification, design, and selection as advanced engineering materials with a strongly defined chemical basis.

490 citations