Showing papers in "Construction and Building Materials in 1997"

TL;DR: In this paper, the results of some research work carried out with corroded concrete beams, under the Brite/Euram project BE-4062 started in 1992 and some models are being developed for the assessment of concrete structures affected by steel corrosion and other deterioration mechanisms.

TL;DR: In this article, the rheological properties of styrene-butadiene-styrene copolymer (SBS) modified bitumens were studied using dynamic mechanical analysis over wide ranges of temperatures and frequencies.

TL;DR: In this paper, a systematic research on the pozzolanicity of different bricks and clays was carried out, based on chemical, mineralogical-petrographical analyses and pozzolicity tests, applied to measure the capacity of crushed bricks in fixing calcium hydrate.

TL;DR: In this article, a model is developed, based on neurocomputing, for predicting, with sufficient approximation, the compressive strength of cement conglomerates, and the experimental data obtained during construction of the "Alto Sulcis Thermal Power Station" at Portovesme, Italy, were used in the tests.

TL;DR: In this article, an attempt is made to assess the engineering aspects of the various surface treatments so that a procedure for their selection can be proposed, and a procedure is proposed to evaluate the effectiveness of these treatments.

TL;DR: In this paper, a set of tests was designed to determine the performance of commercial silicone-based products, using typical 'bridge' concrete (made with OPC or blast furnace slag cement).

TL;DR: In this article, a methodology has been defined and implemented which is substantially based on three principal steps: laboratory characterization of the materials sampled from the walls, and choice of grouts suitable for injection through an injectability test, injection on site of check points, and control of the injection efficacy by flatjack test and survey of the penetration and diffusion of the grout.

TL;DR: In this paper, the influence of two different curing conditions (in water at 27°C, and in air at 15°C and 60% relative humidity) on the mechanical and durability properties of fly-ash cement pastes and mortars are studied.

TL;DR: In this article, the authors examined the methods of improving traditional earth construction in two major villages in Botswana and concluded that traditional ground earth construction may be improved by using certain ratios of cement and lime as stabilizers.

TL;DR: In this paper, a laboratory investigation of the relationship between bitumen chemistry and low temperature behavior of asphalt mixtures is described, showing statistically significant relations between chemical characteristics of bitumens and fracture temperature of asphalt specimens.

TL;DR: In this article, the authors explored the possibility of other roles played by the bricks, especially in the case of very thick joints, perhaps producing a good bond while also serving as aggregates and giving overall good physical and mechanical performances to the mortars.

TL;DR: In this paper, the influence of silica fume on the properties of high-strength steel-fiber reinforced concrete (HSFRC) was investigated by using silica-fume of two different percentages and three different hooked-end fibers namely, 30/0.5, 1.0 and 2.0 by volume of concrete.

TL;DR: In this article, the authors present the results of experimental evaluation on fracture toughness of asphalt concrete at various low temperatures (from −5°C to −30°C in 5°C steps).

TL;DR: In this paper, the effectiveness of concrete surface treatment materials, such as silane, siloxane, acrylic coating, etc., in reducing chloride-induced reinforcement corrosion was investigated, and the data developed in this investigation indicated that the performance of coatings can be quickly evaluated using impressed current technique.

TL;DR: In this article, a stress analysis in concrete due to corrosion of reinforcement was carried out, based on the concept of the linear elastic fracture mechanics (LEFM) and the boundary element method (BEM).

TL;DR: In this paper, the utilization of modern materials such as fiber reinforced plastics (FRP) for strengthening and rehabilitation of concrete and masonry structures is presented three different applications of FRP will be discussed in one application, composite plates are epoxy bonded to the soffit of girders to increase their ultimate strength.

TL;DR: In this paper, concrete cylinders with an embedded reinforcing bar and different water cement ratios were cured for different periods and then exposed in a salt spray chamber (according to ISO-9227).

TL;DR: In this paper, the authors present information which arises from a large project on the evaluation of the performance and durability of repair materials being carried out at the Civil Engineering Materials Unit, University of Leeds.

TL;DR: In this paper, the microstructural parameters controlling the destructive effect of NaCl crystallization in porous stones, and specifically in the highly porous biocalcarenite of the historic masonries of the medieval city of Rhodes, are studied.

TL;DR: In this article, a special monitoring system is developed to monitor the corrosion risk for the reinforcement in concrete structures exposed to aggressive environment due to chlorides penetrating into the concrete or due to carbonation of the concrete.

TL;DR: In this article, the main properties of a protective coating for concrete and reinforced concrete structures are discussed and the importance of evaluating water and water-vapour permeability is highlighted.

TL;DR: In this article, the issue of compatibility of concrete and repair mortars and implications for durable repair is discussed, and some broad suggestions for specification of cement based repair materials are discussed.

TL;DR: In this article, the effect of water content and the geometrical variation of pore shape on the effective dielectric properties of concrete is investigated. And the authors focus on the effect that water content has on the effectiveness of concrete.

TL;DR: In this article, the authors present an experimental investigation on the variation of residual fracture toughness of concrete with elevated temperatures, including cyclic heating effects where the specimens were subjected to cycles of heating and cooling.

TL;DR: In this article, a joint U.S. and Italian effort is investigating the effectiveness of grout injection for repair of damaged or deteriorated masonry structures using a nondestructive acoustic tomographic imaging technique.

TL;DR: In this paper, the effects of steel micro-fibre on the complete load-displacement response of a high performance concrete in tension and compression were examined from tests performed on specimens composed of high strength concrete under controlled strain through a closed-loop system.

TL;DR: In this paper, the influence of temperature, cement type and level of consolidation of concrete on chloride ingress into conventional and high-strength concretes was evaluated, and four concrete mixes having the same workability were made, two with an ordinary Portland cement (OPC) and two with sulphate-resisting cement (SRPC) for a period of 180 days.

TL;DR: In this paper, a short length square concrete column strengthening method is presented, where the steel jacket is formed by two bent plates I, shaped welded longitudinally in the two common corners, leaving a small clearance with respect to the original column surface that is injected with a polymeric grout afterwards.

TL;DR: In this article, a performance-based binder specification for the Gulf countries, based on the findings of the Strategic Highway Research Programme (SHRP) carried out in the United States, considering the prevailing environmental and traffic conditions and type of locally produced bitumen.

TL;DR: In this article, the use of radar for non-destructive testing (NDT) of concrete is examined through radar measurements of laboratory size concrete specimens, where the emphasis is given to the determination of the specimen thicknesses at three different microwave frequency ranges: 2.4 GHz (S band), 3.4 ∼ 5.8 GHz (C band), and 8 ∼ 12 GHz (X band).