... the heat production rate in 14 samples of cement paste or mortar. As it is not thermostated, its performance is governed by the ambient temperature stability and the heat capacity balance between each sample and its reference. The paper shows that the instrument can be used to detect cement-admixture...

...S Jiang; B-G Kim; P-C Aïtcin Using the mini-slump and slump tests, three low-alkali Portland cements were found to be incompatible with a PNS superplasticizer in terms of fluidity loss in cement pastes and con-cretes having low W/C ratios (0.30 to 0.35). The addition of a small amount of sodium...

...L Struble; R Szecsy; W-G Lei; G-K Sun Much has been learned in recent years about the rheology of cement paste and how it relates to microstructure. Such progress has been made possible in part by the use of specialized instruments for measuring dynamic rheological properties, developed...

...HA Toutanji; T El-Korchi The effect of silica fume on the compressive and uniaxial direct tensile strength of portland cement paste and mortar is reported. Sixteen and 25% of the cement used in the paste and in the mortar, measured by mass, was replaced by silica fume. Four different W/C ratio...

...P Gu; P Xie; JJ Beaudoin AC impedance techniques have been recently applied to investigate the electrical properties of hydrating cement pastes. A review of recent applications of AC impedance spectroscopy (ACIS) in cementitious materials studies including some relevant applications...

... performance, dimensional stability,cement paste, aggregate, mineral admixtures, superplasticizer, proportioning, strength grading In the coming decades, concrete will be increasingly called upon to serve as a construction material for hostile environments such as seafloor tunnels, offshore piers and platforms...

...C Atzeni; L Massidda; U Sanna With a view to establishing a relationship between the rheological behavior of cement pastes with varying water/cement ( W/C ) ratios and the workability of different mortars, rotoviscosimetric (hysteresis cycle and transient) tests were conducted on the pastes...

...WJ McCarter; AB Afshar This paper details a novel electrical technique for monitoring the chemical and physical changes occurring within cement paste. The present study has concentrated on the initial 24 h after gaging with water and investigates the influence of retarders, accelerators...

...GR Gouda; DM Roy By proper application of heat and pressure to a cement paste having a very low water/cement ratio W/C , a hard, strong, dense cylindrical specimen is formed in a very short time. Specimen preparation is simple and only a few grams of cement are required. Compression and splitting...