Showing papers in "Construction and Building Materials in 2000"

TL;DR: In this article, the authors provide evaluations of in-situ and laboratory tests on materials for existing unreinforced masonry structures and, in particular, touch upon the difficulty of interpreting the results of NDE tests.

TL;DR: In this paper, a laboratory study was undertaken to evaluate the effectiveness of CKD as a soil stabilizer, and the results revealed that increases in the unconfined compressive strength (UCS) of soil were inversely proportional to the plasticity index of the untreated soil.

TL;DR: In this article, a study was made of an ash produced in Senegal to establish the existence and origin of silica, and the presence of quartz was detected on the interior and exterior surfaces of the uncalcinated husk which may promote pozzolanic action on the surface of the husk and therefore enable its use in lightweight concrete.

TL;DR: In this paper, the behavior of high performance concrete (HPC), compared with normal strength concrete (NSC), after subject to different high temperatures (800 and 1100°C) and cooling regimes (gradual and rapid cooling).

TL;DR: In this article, the authors discuss the need to change the image of the concrete repair industry as one that is often self-serving, and discuss the deficiencies in our knowledge of corrosion and corrosion protection in concrete repair, methods of testing and in the science of repair durability.

TL;DR: In this article, the tensile characteristics, bond strength and pullout behaviour of AFRP and CFRP rods embedded in cement grout are discussed, and the pullout test program involved four types of rods, four types and three types of anchorage tubes with three bonded lengths.

TL;DR: In this paper, three elastomeric surface coatings were applied to naturally carbonated reinforced concrete components obtained from buildings that were suffering from reinforcement corrosion, and the results showed that the most successful coating had a relatively low but uniform bond strength to the concrete and appeared to have a beneficial effect on its ability to accommodate movements of the substrate.

TL;DR: In this article, the improvement of physical and mechanical properties of some Cameroonian lateritic soil bricks by stabilization through heat (at very low temperatures), with a view to finding their suitability for the construction of simple houses.

TL;DR: In this paper, the authors used epoxy-bonded continuous horizontal steel plates for shear strengthening of reinforced concrete beams using a two-dimensional non-linear finite element analysis.

TL;DR: In this paper, the authors present a study of the flexural behaviour of reinforced concrete slabs with ferrocement tension zone cover and show that the use of the cover slightly increases the ultimate flexural load and increases in the first crack load.

TL;DR: In this article, the effect of different superplasticizers with respect to the setting behavior and compressive strength of different cements has been analyzed by differential thermal analysis (DTA) at different time intervals (1, 3, 7, 28 and 360 days).

TL;DR: In this article, the authors investigated the durability of historic mortars in relation to the production technologies employed and found that even though these mortars present low strength and elastic moduli they confer durability to the structures surviving today.

TL;DR: In this article, physical hardening of five unmodified and 35 polymer modified bitumens was studied using a bending beam rheometer (BBR), and the results indicated that physical hardens significantly influenced the creep response of the binders, and the hardening index and horizontal shift factor were strong functions of isothermal storage temperature.

TL;DR: In this article, the first part of an investigation on improved assessment of mass concrete dams using Acoustic Travel Time Tomography (ATTT) is presented, which combines aspects of ultrasonic measurements previously used for material characterization, ultrasonic methods applied to test concrete and features of methods used in shallow seismic surveys.

TL;DR: Bond et al. as discussed by the authors used acoustic travel time tomography (ATTT) to locate and characterize cracks, voids and other anomalies deep within a mass concrete dam and reported the application of the methodology, instrumentation, and data analysis techniques developed during the study.

TL;DR: In this paper, the roughness of the surface of the cut concrete is defined as a series of irregular waves and a roughness parameter is dependent on the peak-to-trough depth and the respective wavelength.

TL;DR: In this paper, the influence of various processes on the performances of hardened composites is examined, and the authors focus on the influence that various processes have on the performance of hardened composite.

TL;DR: In this paper, a proof test was performed to investigate the improved seismic performance of parking structure columns retrofitted with carbon fiber composite jacketing, which allowed the column to develop excellent hysteretic response with stable load carrying capacity and significantly improved ductility.

TL;DR: In this article, the authors studied the compressive strength of pozzolana in SAB cement and found that 5-15% of the pozzolanic reaction was optimal for SAB.

TL;DR: In this article, the acoustic emission signature of concrete beams reinforced with fiber reinforced polymer (FRP) or steel re-bars was compared under bending and the results showed that the FRP-RC beams emitted higher activity and peak amplitude than their steel-RC counterparts.

TL;DR: In this article, the authors investigated the stress-strain relations under repeated loading for resin concrete cylinders, which were then subjected to four different temperature stations of 20, 100, 150 and 200°C and then tested in compression using six cycles of loading and unloading to get the stressstrain relation for each case.

TL;DR: In this paper, the fatigue and fracture performance of prestressing round steel bars which have undergone progressive strain hardening produced by repetitive cold drawing is analyzed. But the authors focus on the macroscopic evolution of the crack shape, together with a fractographic study of the broken specimens by scanning electron microscopy (SEM).

TL;DR: In this paper, a case of long-term and frequent highway pavement failure induced by poor soil properties, at a locality along the F209 highway at Ado-Ekiti was investigated.

TL;DR: In this article, the application of an electrical resistance method for monitoring of the state of steel reinforcement in concrete and its rate have been described, including an estimation of quantitative data on corroding steel reinforcement, including the values of a cross-sectional decrease, the depth of the corroded layer, the mass loss of steel material due to corrosion, and the possibility of the mathematical modelling of the dependence of the steel reinforcement on important factors like ambient relative humidity, concentration of chloride in embedding concrete and others.

TL;DR: In this article, Morton specimens were coated with six different surface treatments for almost a year and then chloride profiles were measured by fitting the error function solution of Fick's 2nd law to the profiles in the substrate, indicating that chloride diffusion into the substrate was restricted by the surface treatments.

TL;DR: In this paper, a semi-mobile dryer/calciner plant for pozzolana calcination is presented, which can be dismantled, moved over land (road network) and sea, and assembled within a few days.

TL;DR: In this article, the authors studied the performance of precast reinforced concrete pile caps and the ultimate load-carrying capacity and found that the precast pile cap behaved in a similar manner as compared with the conventional cast in situ pile cap.

TL;DR: In this article, high-tensile steel black bolts have been used with solid timber, glulam and two commercially available structural timber composites, Microlam TM and Parallam TM.

TL;DR: In this article, the authors present a more detailed analysis of the environmental impacts of concrete, based on specific calculations configurable down to individual site level, and reveal both that there is a wide range of impacts for different mixes and there is not always a simple positive correlation between impacts.

TL;DR: In this paper, the influence of chemically modified silica fume (MSF) on the sulfate resistance of cement-based materials was investigated, showing a significant increase of sulfate resistances of materials based on Portland cement slag blends and slag binder.