Showing papers in "Construction and Building Materials in 2003"

TL;DR: In this paper, a new design-oriented stress-strain model is proposed for concrete confined by FRP wraps with fibres only or predominantly in the hoop direction based on a careful interpretation of existing test data and observations.

TL;DR: In this paper, the Chen and Teng bond strength model is combined with a simple section analysis for predicting the strength of beams and slabs which fail by intermediate crack-induced debonding.

TL;DR: In this paper, a simple, accurate and rational design proposal for the shear capacity of FRP-strengthened reinforced concrete (RC) beams which fail by FRP debonding is presented.

TL;DR: In this paper, the authors evaluate the mechanical properties and durability characteristics of steel slag aggregate concrete in comparison with the crushed limestone stone aggregate concrete, and find that the durability performance of both steel slags and crushed limestone aggregate concretes was evaluated by assessing water permeability, pulse velocity, dimensional stability and reinforcement corrosion.

TL;DR: In this paper, an accelerated carbonation test was carried out in order to assess the carbonation of fly ash (FA) concrete, and the results showed that FA concrete made with 70% replacement ratio was carbonated more than that of 50% FA replacement concrete and normal Portland cement (NPC) concrete.

TL;DR: In this paper, the authors present an overview of the research and development of applications of advanced composites to civil infrastructure renewal at the University of California, San Diego (UCSD).

TL;DR: In this paper, the effect of four types of coarse aggregates, namely calcareous, dolomitic, quartzitic limestone, and steel slag, on the compressive and tensile strength, and elastic modulus of high strength concrete was evaluated.

TL;DR: The method of strengthening concrete structures with FRP composites has existed for over a decade; the most common way to strengthen structures is in bending, but also wrapping of columns is quite...

TL;DR: In this paper, a model specification for FRP composite materials for use in civil engineering structural systems is described, and a protocol for predicting long-term property values subjected to accelerated aging based on the Arrhenius model is presented.

TL;DR: In this paper, the authors investigated the weathering mechanisms and weathering forms in two calcareous stone types used in monuments and buildings on the SW coast of France and determined the mineralogical, chemical, textural and pore-system characteristics of freshly quarried and decayed stones from quarry, monuments, and buildings, and salts loading identified.

TL;DR: The results of a research project carried out on masonry panels obtained from structures struck by the Umbria-Marchigiano earthquake of 1997-1998 are presented in this article, which consists of two parts: tests were performed in the laboratory, and in situ in order to determine the correct parameters describing masonry behavior.

TL;DR: The introduction of polymers and advanced polymer composites in the civil infrastructure has been a very rapid process in comparison to other civil engineering materials when they were in their infancy as discussed by the authors, which has enabled the design engineers to have greater confidence in the materials' potential and consequently to use them in the renewal of civil infrastructure ranging from the strengthening of reinforced concrete, steel and cast iron, and the seismic retrofitting of bridges and columns for the use in replacement bridge decks and in new bridge and building structures.

TL;DR: In this paper, a fracture mechanics based finite element analysis of debonding failures of reinforced concrete (RC) beams is presented, which can successfully simulate the concrete cover separation failure mode in FRP strengthened RC beams.

TL;DR: In this article, the authors report on the North American state-of-the-art in the use of FRP composites in concrete structures, including parking garages, multi-purpose convention centers, office buildings and silos.

TL;DR: In this paper, an experimental and analytical investigation for evaluating the ultimate response of unreinforced and reinforced concrete slabs repaired and retrofitted with fiber reinforced polymer (FRP) composite strips was presented.

TL;DR: In this article, the effects of highly reactive aggregate, fused silica, and slowly reactive aggregate on the mechanical properties of concrete were investigated over a period of 12 months were the compressive strength, direct tensile strength, tensile splitting strength, flexural strength (modulus of rupture), static modulus of elasticity and water absorption.

TL;DR: In this article, the authors used ACI 440.1R-01 to predict deflections in concrete beams reinforced with fiber reinforced polymer (FRP) bars and crack width in beams with one-layer FRP bars.

TL;DR: In this paper, the authors applied systematically sonic tests, radar tests and other diagnostic techniques on the remaining walls and piers of the Cathedral of Noto, where the right aisle and most of the dome of the cathedral collapsed in 1996.

TL;DR: In this article, the effects of used engine oil on properties of fresh and hardened concrete were investigated and the main variables included the type and dosage of an air-entraining agent, mixing time, and the water/cement ratio of the concrete.

TL;DR: In this article, the authors used acoustic emission technique (AET) for the investigation of local damages in materials and presented several methods to enhance the quality of such recordings or to improve the data analysis.

TL;DR: In this paper, the authors investigated the use of CKD as a cementitious material in concrete and mortar mixtures to study its effect on the strength and ability of the cover zone to absorb water, an important factor in the deterioration process.

TL;DR: In this article, the authors present a unique strengthening technique for existing concrete columns that use expansive materials to apply lateral pre-tensioning, which increases the capacity and ductility of a column as well as achieving better utilisation of the confining FRP material.

TL;DR: In this paper, the authors investigated the ductility enhancement with the confinement of carbon fiber reinforced polymer sheets (CFRP sheets) and suggested a confinement factor of CFRP and an equivalent transversal reinforcement index.

TL;DR: In this paper, the authors developed an effective repair technique for rapid bridge restoration after an earthquake, four hollow bridge columns were cyclically loaded to failure, repaired and retested, and the repair process includes using dog-bone shape bars to replace the fractured longitudinal bars in plastic hinges and using FRP (Fiber Reinforced Plastic) wraps to enhance the deformation capacity of columns.

TL;DR: In this paper, the authors tested new materials, stones, mortars, grouts for injection in order to choose the material to be used for the reconstruction of the pillar and for the repair of damaged elements.

TL;DR: In this article, the effect of curing and storage on 40×40×160 mm 3 OPC rice husk mortar specimens is described, and two conditions are studied; one-year storage at 50% RH and at 95% RH.

TL;DR: In this paper, a duplex beam is analyzed where the high-compressive strength concrete is placed above, and the high strength and stiffness fiber/polymer composite is placed below the neutral axis; in this form the two materials will be used to their best advantage.

TL;DR: The ochre patina that covers the limestone facades of Palacio de Nuevo Baztan is composed of calcite, clay minerals, gypsum, quartz, potassium feldspar, alongside traces of calcium oxalates, calcium phosphates, iron oxides and hydroxides.

TL;DR: In this article, an acoustic emission-simplified Green's functions for moment tensor analysis is used to determine the crack kinematics of locations, types and orientations.

TL;DR: In this paper, the behavior of concrete-filled fiber reinforced polymer (FRP) circular tubes with different failure modes is examined. And the effects of concrete fill, laminate structure of the tube, reinforcement ratio based on the wall thickness, as well as various failure modes are examined.