Showing papers in "Construction and Building Materials in 1999"

TL;DR: In this paper, the compressive strength, degree of pozzolanic reaction, and porosity of zeolite modified cement pastes were compared with those obtained from similar blended pastes prepared with silica fume and fly ash replacements.

TL;DR: In this paper, an experimental analysis on a new composite material, cork-gypsum composite, is presented, which is shown that cork and plaster are mutually compatible and a lot of new building materials can be made by mixing those materials in different volume fractions.

TL;DR: In this article, a comprehensive study on the mechanical properties of expansive-cement concrete containing silica fume and polypropylene fibers was performed, and the results showed that the use of 5% silica and 10% fiber volume fraction results in optimum mixture design for repair applications from the standpoints of workability, bond, strength, length change and permeability.

TL;DR: In this paper, the influence of polypropylene and metallic fibres (Fibraflex) has been studied in different proportioning to reduce shrinkage and cracking in reinforced fiber mortars.

TL;DR: The flexural behavior of polymer concrete (PC) made with different types of resins was evaluated in this paper, and the results showed that the modulus of rupture and ultimate compressive strains for PC are much higher than that of ordinary Portland cement concrete.

TL;DR: In this article, quantitative acoustic emission techniques were used to measure microfracture properties in an array of cement-based materials of varying microstructure, and microcracks were modeled using a seismic moment tensor, which could be estimated through deconvolution of the measured acoustic emission waveforms.

TL;DR: In this paper, composites of blast furnace slag (BFS) based cement mortar reinforced with vegetable fibres are presented to produce roofing components with a simple and low-energy consuming method, including ordinary vibration and curing in a wet chamber.

TL;DR: In this paper, an acoustic emission (AE) is monitored to characterize the seismic behavior of column foundation and an AE moment tensor analysis is applied to analyze the fracture process quantitatively.

TL;DR: In this paper, a comparative analysis of the shear behavior of mechanical connections in thin-gauged steel is carried out and the connection techniques considered are press joining, Henrob fasteners, pop rivets and self-tapping screws.

TL;DR: In this article, the influence of concrete characteristics (type of binder, mix proportions, length of cure) on the correlation between total charge and both initial current and conductivity measured at the beginning of the test was investigated.

TL;DR: In this article, the surface properties of mortars, which are exposed to sulphate environments, have been studied using SEM, microanalysis, X-ray diffraction and Vickers hardness testing.

TL;DR: The use of self-hardening slurry trench cut-off walls of Cement-bentonite is increasingly being used in the United Kingdom as discussed by the authors, however, there is little information on their long-term performance.

TL;DR: In this paper, the performance of polymer-modified asphalt mixtures and specially designed reinforcement techniques against reflection cracking for the typical asphalt pavement overlays was evaluated and the effectiveness of the devised crack preventing techniques was evaluated.

TL;DR: In this article, the authors present the preliminary findings of a research program to characterise the strength of rebar splices in reinforced concrete members containing FRP reinforcement, where the key parameters are the diameter of FRP rebar and the embedment length.

TL;DR: In this article, a composite/concrete beam has been fabricated to use two component materials, fibre-reinforced polymer composite and concrete, to their best advantage, and six techniques used to develop this connection to give the most efficient shear transfer in order for the whole beam to act compositely.

TL;DR: In this paper, the effect of the exposure temperature during and after the application of a tiling system on the development of bond strength of the adhesive was evaluated, and the results reflect the importance of a proper mix design especially when works have to be carried out under hot and dry weather.

TL;DR: In this paper, acoustic emission characteristics due to micro-cracking are studied in full-scale prestressed concrete-piles by applying acoustic emission techniques, fundamental study on the fracture mechanism of the piles under both cyclic and monotonic loads is made.

TL;DR: In this paper, it is shown that through increasing the amount of detail, certain phenomena may be observed that seem to correspond to limits that are reached in practice as well, such as the limit reached when trying to fill a plane with circular aggregates.

TL;DR: A scanning electron microscope study was performed on samples cored from the white-marble panels of Finland Hall's facade which revealed considerable warping only a few years after the building's completion.

TL;DR: In this article, the effect of marine exposure conditions and duration on the bond strength of epoxy-coated bars in concrete and on the difference in bond strength between uncoated and polyethylene-polysilicon (Polysilicon) bars was investigated and assessed.

TL;DR: In this article, the behavior of several porous carbonate building stones used in Spanish and English monuments was compared and physical properties that affect the transfer of moisture were determined before and after exposure, and related to the degree of reaction of the stones.

TL;DR: In this paper, the authors present experimental results obtained with the direct pull-out test using machined and wrapped glass/vinylester FRP rods with axisymmetric lugs.

TL;DR: In this paper, an attempt has been made to explain the mechanism of corrosion protection behavior of microsilica added concrete immersed in seawater and NaCl solution, and it has been noted that densified micro-silica provides better corrosion protection to the rebars than the undensified one.

TL;DR: In this paper, the authors studied the crack extension of mixed-mode failure in concrete by applying the acoustic emission (AE) and the boundary element method (BEM) in bending tests of notched beams, and the crack traces are analyzed by two-domain BEM, based on the maximum circumferential stress criterion by Erdogan-Sih, and are in remarkable agreement with those of tested beams.

TL;DR: In this paper, a new Hilti shear connector was developed with the paramount objective of breaking the speed barrier by using modern fixing techniques such as the multi-purpose hilti cartridge-operated gun.

TL;DR: In this paper, a spring-network approach is used to study cracking in scaled models of reinforced concrete bridge piers, which are subjected to eccentric loading, and an energetic fracture mechanics approach was used to model tension softening of developing cracks.

TL;DR: In this paper, a study of the behavior of marble beams under four-point bending tests is presented, where the nominal strength and the global response of a given geometry and load configuration depend on the specimen sizes.

TL;DR: In this paper, a catalyzed epoxy-phenolic reaction utilizing commercially available phenolic resins and liquid epoxies to promote a predominately (50-90% w/w) phenolic network which produces little or no volatiles.

TL;DR: In this paper, the behaviour of Portland cement and Portland cement with 30% fly ash in 10% ammonium-sulphate solution was studied within a comprehensive research program All materials have been chemically analysed and their physico-chemical and mechanical properties have been investigated X-ray diffraction was used for following changes into microstructure after storage of samples in ammonium sulphates solution, and phase composition changes were identified.

TL;DR: The effectiveness of reinforced concrete repairs may be established in terms of their ability to restore the structural integrity of the reinforced concrete element and to protect the reinforcement from severe weathering conditions as discussed by the authors.