...PD Tennis; JM Melander ASTM C 1157 has undergone several changes since it was first adopted in 1992 as a performance specification for blended cement. Those changes have increased the number of available options and broadened the scope of the standard to include portland cement. However, the level...

... the performance standards needed in the coming years. acceptance Europe performance portland cements precision statements production product quality specification standards testing variability References Form and Style for ASTM Standards , ASTM , Philadelphia , 1989 , p. 94 . Annual...

... test method for strength could provide a very useful starting point. specifications standards portland cements testing chemical analysis international standards References British Standard Specification for Portland Cement, Engineering Standards Committee , British Standards...

... output. However, the share of the blended cements increased to 30% in 1975, to 75% in 1979, and to 92% in 1985. Of the four types of blended cements produced (namely, modified portland cement, trass cement, iron portland cement, slag cement), modified portland cement appears to be popular, accounting...

... carried out at 38°C fail to confirm that strength development is directly related to vitrification. slags portland cements chemical composition nonferrous slags cementitious properties pozzolanic activity portland cement replacement References Collings , R. K. and Wang , S. S. B...

...S Popovics The strength accelerating effect of a chloride-free admixture is investigated with two types of commercially available portland cements, each with two different fly ashes. The accelerator is a water-soluble organic material belonging to the carboxylic acid group. The results show...

... in the excellent report on the use of energy within the cement industry. Kenneth E. Daugherty 1and John E. Funnell 2 The Incorporation of Low Levels of By-Products in Portland Cement and the Effects on Cement Quality REFERENCE: Daugherty, K. E. and Funnell, J. E., "The Incorporation of Low Levels of By-Products...

...LU Spellman It is to be expected that the influx of preheater/precalciner technology will result in a general increase in portland cement alkali level. High-alkali cement is associated, in general, with rapid early strength development and disproportionately lower 28 day strength in mortar cubes...

... suggested that variable proportions of fly ash and cement be used in the pozzolanic activity tests to facilitate optimization of concrete properties. fly ash portland cements standards specifications tests flow measurement water requirement pozzolans chemical reactions strength fineness...

...SK Syal; SS Kataria Alkali contents of portland cement/clinker significantly affect the hydration reaction rate and the development of mechanical strength of cements. An accurate, rapid method has been developed for the quantitative determination of alkalies sodium oxide and potassium oxide by use...

... 174 61.3 167 61.8 168 KEYWORDS: cements, portland cements, mortars, concrete durability, chemical resistance, durability, heat resistance, polymer dispersions, polymer-modified mortars, weatherability Polymer-modified mortars contain large amounts of polymers that supplement portland cement...

... that water vapor in a particular pressure-temperature range is critical for the reaction. Water released from the aggregate by sustained heating is in part responsible. KEYWORDS: aggregates, dolomite, concretes, petrography, portland cements, pozzolans An experimental study was undertaken in the Mineral...

... prism for measuring expansion strains. KEYWORDS: cements, portland cements, stresses, strains, expansion, shrinkage-compensating cement, residual (net) strain, external and internal restraint, shrinkage, curling/warping, bowing, compressible isolation joints, Type K cement, elastic strain theory...

...D Manmohan; PK Mehta Durability of concrete is greatly influenced by the permeability of the cement paste which in turn is governed by the pore size distribution. Some mineral and chemical admixtures are known to enhance the durability of portland cement concrete. The objective of this work...

... appears to depend, in part, on the chemical composition of the fly ash and also on the percent weight replacement of cement by fly ash. aggregates alkali aggregate reactions portland cements chemical properties fly ash concretes cement alkalies mortar bar expansion pozzolans reactive...

...DL Kantro A miniature slump test has been developed for the evaluation of the influence of water-reducing admixtures on the workability of neat portland cement pastes. Resulting paste pat areas rather than heights are measured, and the results are expressed as the percentage of water reduction...

...CE Buchanan, Jr The object of this research program was to enable us to predict very rapidly the performance of portland cement in the field in relationship to abnormal setting characteristics. A cement water leach is prepared, and the filtrates are analyzed for calcium and sulfate. A sodium (DI...

... in the medium inhibits expansion; this is accomplished by replacing 40% or more of the cement with pozzolan. KEY WORDS: concretes, portland cements, sulfate-resisting cements, cement additives, pozzolans, reactive aggregates The publication of a review of sulfate attack of concrete by Kalousek et al [1] has...