Author
R. W. Nurse
Bio: R. W. Nurse is an academic researcher. The author has an hindex of 1, co-authored 1 publications receiving 5 citations.
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TL;DR: In this article, a non-ideal solid solution aqueous solution (SSAS) between the end-member components CaH{sub 2}SiO{sub 4} (CSH) and Ca(OH) sub 2} (CH) using equations defining the solidus and solutus curves on a Lippmann phase diagram was proposed.
56 citations
TL;DR: In this paper, NaxFexTi2−xO4 was obtained via hydrothermal route at a temperature lower than 200 ǫ c for the first time, using Natural ilmenite sand, a low cost reagent, was used as a precursor and reacted with 10 mol/l NaOH for 70 h to obtain high yield (92% wt) of Nax FexTi 2−x O4 with x ∼ 0.76 − 0.79, as evaluated through the Rietveld refinement and quantitative phase analysis of X-ray powder
9 citations
TL;DR: In this paper, the same SiO2/Al2O3 ratio was used to identify ettringite, tetracalcium aluminate hydrate, tobermorite and hydrogarnets.
Abstract: Slags of varying CaO content, having same SiO2/Al2O3 ratio were hydrated in presence of varying proportions of lime and mixtures of lime and gypsum for different periods. The hydrated materials were subjected to DTA. When slags were hydrated in presence of lime only there appeared tetracalcium aluminate hydrate in all cases. Tobermorite and hydrogarnets were also possibly formed. Absorption of lime was indicated in all cases. This decreased with increase of CaO1 in the slag and increased with time. When slags were hydrated in presence of lime and gypsum, the compounds identified were ettringite, crystalline solution of ‘low-sulfate’ aluminate sulfate double salt and tetracalcium aluminate hydrate. The former changed over to the latter when the proportion of gypsum in the mixture was low and lime in the mixture or CaO in the slag was high. Absorption of lime during hydration in presence of lime and gypsum was always more than in presence of lime only and this increased with acidity of slag and with time. A...
3 citations
TL;DR: In this article, a few glassy slags in the system, CaO-Al2O3-SiO2 were prepared having a fixed SiO2/Al 2O3 ratio of about 1.15 and different proportions of CaO in the range of 35-50 per cent by weight.
Abstract: A few glassy slags in the system, CaO-Al2O3-SiO2 were prepared having a fixed SiO2/Al2O3 ratio of about 1.15 and different proportions of CaO in the range of 35–50 per cent by weight. The hydraulic properties of the slag powders in admixture with different proportions of hydrated lime were studied. The hydraulicity of the slags increased with increase in the proportion of CaO in their chemical compositions and also with the increase of lime in the mixture. The amount of lime necessary for the development of maximum strength was found to decrease with increasing CaO content of the slag.
2 citations
01 Jan 2006
TL;DR: In this article, the influence of two different types of Portland cement on the creep property of concretes is investigated. But the authors focus on the removal of adsorbed water.
Abstract: This paper reports on a study of the influence of two different types of Portland cement on the creep property of concretes, a viscous elastic property originating in the hardened cement paste and presumably related mainly to the removal of adsorbed water. The causes of creep in concrete are complex. It is a generally accepted fact that, in addition to the movement of moisture, other causes contribute to the creep phenomenon. The nonlinearity of the stress-deformation relation in concrete, especially at levels of stress exceeding 30 to 40 per cent of the ultimate stress, clearly indicates the contribution of transition zone microcracks to creep, a phenomenon well known in civil and materials engineering. The controlled microstructure formation technique has been indicated as a promising alternative for understanding the creep mechanism. This study included a review of the literature to identify the main parameters and variables involved in the creep property,