...I Luker; SW Tabsh If a concrete specimen is tested to failure in compression and the machine allows the longitudinal strain in the specimen to be non-uniform over the cross-section of the specimen at its maximum load, then that load is lower than it would be if the strains were uniform. The results...

...ZC Grasley; DA Lange The potential for drying shrinkage cracking in concrete is related, in part, to the development of a moisture gradient across the cross-section of the concrete element. A model has been developed that incorporates experimental measurements of internal relative humidity...

..., it is not necessarily robust. Sometimes a little variation in the dosage of the admixture could lead to detrimental side effects, such as segregation, excessive set retardation, or excess air content in the concrete. Results showed that the chemical composition of the cement is critical to ensure good compatibility...

...A Tagnit-Hamou; N Petrov A new method involving a slight acceleration of curing is proposed to evaluate the sensitivity of a particular cement or particular mortars to DEF and consequent expansion. It can be used to determine the maximum concrete temperature below which the risk of DEF is minimal...

... not possible or results in significant damage to the samples. Sulfur-capped specimens require more handling than non-sulfur capped specimens. To minimize handling, a new material is proposed for use as an end pad for compressive strength testing. Similar to the approach used for conventional concrete cylinders...

...PE Grattan-Bellew; G Cybanski; B Fournier; L Mitchell The Concrete Microbar Test is modified after a Chinese test, for alkali-carbonate reactive aggregates. The protocol for the test is essentially the same as for ASTM C 1260, Standard Test Method for Determining the Potential Alkali-Silica...

...JE Gillott; T Quinn Concrete prisms and cylinders were made using four different cementitious materials. These were high alumina cement (HAC), Type 10 Portland, Type 10 with 20% replaced with fly ash and Type 50 Portland Cement. Specimens were used for measurement of length change and estimation...

...A Di Maio; G Giaccio; R Zerbino This paper presents a discussion on the use of non-destructive tests (NDT) for the evaluation of concretes damaged by exposure to high temperatures. The main analysis is based on the relationships between strength, modulus of elasticity and ultrasonic pulse velocity...

...M Saric-Coric; P-C Aïtcin The scaling resistance of slag-blended cements can be critical when tested according to the procedure described in the present ASTM C 672 standard. As soon as slag replacement is greater than 20 percent, the scaling resistance of concretes made with a slag-blended cement...

... to best correlation with the expansion measured on laboratory concrete specimens made with Spratt limestone. The reaction rim is not a real “damage” feature and should not be considered as one but as a “degree of reaction” feature. In an attempt to improve the DRI method for assessing damage related...

..., most of which is not effectively utilized and disposed on-site without any reuse. The main objective of this research is to investigate the potential use of copper slag and cement by-pass dust in concrete as partial replacements for Portland cement. The physical and chemical properties of both slag...

...M-A Bérubé; J Frenette; M Rivest; D Vézina The knowledge of the active- or soluble-alkali content of concrete is useful in the diagnosis and prognosis of alkali-aggregate reactivity (AAR). A method often used for determining this content is hot-water extraction from ground concrete samples...

...MR Nokken; RD Hooton Sorption is a term used for water ingress into pores under unsaturated conditions due to capillary suction. Sorptivity testing has been used as a measure of the ability of concrete to absorb water. Sorptivity tests were conducted on three concrete mixtures, which had been...

...L Struble; TY Kim; H Zhang The standard test for setting of cement provides little understanding of how the cement behaves in concrete. Setting is measured for both cement and concrete using penetration resistance, but the standard tests for these two materials are quite different. With cement...

...., Analysis of the Granular Structures of Aggregates Using Solid Volume Measurement of Elementary Fractions, Cement, Concrete, and Aggregates, CCAGDP, Vol. 23, No. 2, December 2001, pp. 105 112. ABSTRACT: This article deals with the measurement of the solid volumes and hence the packing density of elementary...

...J Larralde; MS Elpert; D Weckermann A considerable amount of concrete structures are currently or will soon be repaired or retrofitted with external reinforcement in the form of fiber reinforced plastic composites. It is important to characterize the bond and adhesion properties of FRP materials...

...SV Kolluru; JS Popovics; SP Shah A technique for determining the elastic material constants of a concrete test cylinder from longitudinal resonance frequencies is proposed in this paper. The proposed technique permits calculation of both the material constants ( E and μ) from one relatively simple...

..., and durability of concrete at partial replacement of cement. With 275 kg/m 3 compound UFPS, 27 5 kg/m 3 Grade 525 # ordinary portland cement, 0.26 water-binder ratio, and 9.7 kg/m 3 high-range water-reducing admixture (HRWRA), a concrete had been prepared with a slump of 240 mm, 28-day compressive strength 101...

...P Rivard; B Fournier; G Ballivy An automatic petrographic test procedure for quantifying damage in concrete affected by alkali-silica reaction (ASR) is presented in this paper. A computer image analysis program was designed to quantify the degree of microcracking and the amount of silica gel...

... and appeared to be associated with preexisting internal fractures. For all three aggregates, the mortar expansion appeared to be associated with expansion of individual aggregate particles. 02 10 1998 22 02 2000 alkali-silica reaction portland cement concrete expansion hydraulic cement...