Showing papers in "Construction and Building Materials in 2002"

TL;DR: In this article, the effect of ageing on bitumen chemistry and rheology was studied, where seven bitumens were aged according to the thin film oven test and the rolling thin-film oven test (RTFOT) and the binders were characterised using infrared spectroscopy, chromatography and dynamic mechanical analysis.

TL;DR: In this paper, the morphological, thermal and fundamental rheological characteristics of EVA copolymer modified bitumens are studied using fluorescent microscopy, differential scanning calorometry and dynamic mechanical analysis using a dynamic shear rheometer.

TL;DR: In this paper, the authors investigated the possibility of using recycled aggregates from different sources in Hong Kong, as the replacement of both coarse and fine natural aggregates in molded bricks and blocks.

TL;DR: In this paper, the authors have focused on the strength behaviour of the soil reinforced with randomly included sisal fibre. And the results of these tests have clearly shown a significant improvement in the failure deviator stress, Shear strength parameters (C and φ) of the studied soil.

TL;DR: In this paper, the authors examined the shear performance and modes of failure of rectangular simply supported reinforced concrete (RC) beams designed with shear deficiencies, which were strengthened with externally bonded carbon fiber reinforced polymer (CFRP) sheets and evaluated in the laboratory.

TL;DR: In this article, a series of nine unreinforced masonry (URM) panels and 24 strengthened panels have been subjected to diagonal compression tests and different reinforcement configurations were evaluated, and experimental results pointed out that FRP reinforcement applied only at one side of the panels did not significantly modify the shear collapse mechanisms (diagonal splitting) of the URM; while double-side configurations provided a less brittle failure and a noticeable ultimate capacity increase.

TL;DR: In this paper, a feasibility study was undertaken on the production of fly ash-lime-gypsum (FaL-G) bricks and hollow blocks to solve the problems of housing shortage and at the same time to build houses economically by utilizing industrial wastes.

TL;DR: The results of experiments carried out on structures damaged in the Umbria-Marche earthquake of 1997-1998 are presented in this paper, where the authors analyze the effectiveness of the intervention, above all as a technique of seismic-upgrading against inplane mechanisms of collapse.

TL;DR: In this article, a finite element investigation into interfacial stresses in reinforced concrete (RC) beams strengthened with a bonded soffit plate is presented, with the aims of assessing the accuracy of existing approximate closed-form analytical solutions based on simplifying assumptions and highlighting aspects which are omitted by them.

TL;DR: In a short-term study, for up to 90 days, properties of oil palm shell (OPS) concrete namely compressive strength, flexural strength, splitting tensile strength, modulus of elasticity, drying shrinkage and initial surface absorption, have been determined and a comparison is made with control concrete as mentioned in this paper.

TL;DR: In this article, the first three natural frequencies of Hagia Sophia in Istanbul have been determined, showing a decrease of approximately 5-10% in the natural frequencies, as the amplitude of the accelerations increases and returns to their initial values, due to the non-linear nature of the masonry.

TL;DR: In this paper, the benefits and limitations of mobile ground penetrating radar (GPR) systems are discussed using examples from EMPA's recent work, where the emphasis is on the investigation of pavement thicknesses and depths of rebar on concrete bridges.

TL;DR: In this paper, the results of an ongoing test program to evaluate the performance of polymer-modified cement-based mortars for repairing surfaces of concrete structures up to a depth of 75 mm (3 inches) damaged due to exposure to cold climates are presented.

TL;DR: In this article, the authors show that both the aggressivity of an acidic environment and the acid resistance of cement-based materials are of a complex nature, and that the evaluation of the environment only on the concentration of the aggressive species is entirely unsatisfactory and incorrect.

TL;DR: In this article, the authors investigated the possibility of using high MnO and low MnO metallurgical slags on samples obtained from an alloy plant in India, and the results of the investigations provide a direction for profitable plans for making blended slag cements.

TL;DR: In this paper, the results of the particle size distribution, three rheological properties (flow time, bleeding and setting time), and five mechanical and strain properties (compressive strength, shear bond strength, modulus of elasticity, Poisson's ratio and drying shrinkage) of high volume fly-ash (HVFA) grouts (cement replacement by fly ash of over 55% by weight), with and without superplasticizer (SP) and/or anti-washout agent (AWA).

TL;DR: In this article, a newly proposed mechanical model is used to simulate the fracture behavior of double-edge notched and double central notched (DCN) concrete specimens loaded in shear.

TL;DR: In this article, the influence of relative air moisture, temperature and concentration of CO 2 on the carbonation of Ca(OH) 2 has been examined under normal climatic conditions.

TL;DR: In this article, a presentation is given of the fundamental design choices and selection of the most appropriate materials and techniques which have been made for strengthening the Monza cathedral bell-tower, based on investigation and structural assessment carried out prior to and during the design process.

TL;DR: In this paper, an approach, using pultruded composites, to rejuvenate low aspect ratio timber beams, which model railroad bridge span timbers, is described, focusing on overcoming the loss of shear properties by inserting fiberglass pultrinuded rods from the bottom to the top of the beam, through areas of damage.

TL;DR: In this article, a 3-point bending test on compressed earth blocks (CEB) is proposed to give their compressive strength, which is similar to the one used in this paper.

TL;DR: In this paper, an experimental program was designed to evaluate the out-of-plane shear strength of masonry wall system; and to evaluate of the influence of the area of externally bonded FRP composites on the shear strengths of the system.

TL;DR: In this article, the authors developed a method to measure internal resistance in hot-mix asphalt (HMA) mixtures and to evaluate the effect of different gradations on the rutting of mixes.

TL;DR: In this article, the compressive strength of masonry composed of mortar and clay bricks is investigated and new models are proposed based on regression analyses involving the mortar and brick compressive strengths and several other parameters relating to the geometry of the brick units, mortar joints or the wall.

TL;DR: In this article, the authors examined the shear strength of three possible waste materials: building debris, crushed concrete and quarry waste, and found that these materials are weaker than natural aggregates and that the presence of soil reinforcement resulted in a significant increase in the shearing resistance of the granular materials.

TL;DR: In this paper, a finite element model capable of predicting the overall behavior of strengthened reinforced concrete (RC) beams including different failure modes accurately is developed, based on the formulation of finite elements and material models and simulation results of some RC beams tested for flexural strengthening with epoxy bonded steel plates.

TL;DR: In this paper, the authors highlight some generalised framework essential for SCSBs weatherability assessment method that are rational, explicit enough and applicable to specific and almost all intended uses under a broad range of environmental concerns.

TL;DR: Ratmix as mentioned in this paper is a comprehensive program for Lees' rational method; it conducts interpolation for intermediate points within the design graphs as well as between graphs of different properties, and has incorporated 58 design graphs of the Lees method.

TL;DR: In this paper, the effect of carbonation on structural behavior of reinforced concrete is studied on four model columns and two model beams, and the conclusion is that carbonation decreases earthquake-resistance of concrete structures.

TL;DR: In this article, a procedure for generating rheological data on aged asphalts from the flow data information on the original unaged samples is presented, which involves the use of the unified curves for each rheology function.