Showing papers in "Construction and Building Materials in 2008"

TL;DR: Alkali-activated binders have emerged as an alternative to OPC binders, which seems to have superior durability and environmental impact as mentioned in this paper, and the proper terminology to designate these new binders will be discussed.

TL;DR: In this article, a rice husk ash (RHA) prepared from the boiler burnt husk residue of a particular rice mill has been evaluated for optimal level of replacement as blending component in cements.

TL;DR: In this article, the effects of bacterial CaCO3 precipitation on parameters affecting the durability of concrete and mortar were compared for their effectiveness in relation to conventional surface treatments, and the results obtained with cultures of the species Bacillus sphaericus were comparable to the ones obtained with conventional water repellents.

TL;DR: In this paper, the authors summarized current knowledge about alkali-activated binders, by reviewing previously published work, and suggested topics for future work in this field and theoretical questions are discussed.

TL;DR: In this paper, the authors examined the possibility of using crushed bricks as coarse and fine aggregate for a new concrete and showed that it is possible to manufacture concrete containing crushed bricks (coarse and fine) with characteristics similar to those of natural aggregates concrete provided that the percentage of recycled aggregates is limited to 25% and 50% for the coarse aggregates, respectively.

TL;DR: In this article, a state-of-the-art report is focused on corrosion inhibitors used in concrete and is based on published studies in the last decade, focusing on the most commonly used inhibitors such as amino alcohols (AMAs), calcium nitrites (CN), and sodium monofluorophosphates (MFPs).

TL;DR: In this paper, the authors measured porosity, gas permeability, velocity and attenuation of ultrasonic wave propagation in the thermally-cracked rock of granite in order to assess, respectively, its transport properties and its mechanical strength.

TL;DR: In this article, a study of the strength, porosity and corrosion resistance of mortars made with ternary blends of ordinary Portland cement (OPC), ground rice husk ash (RHA), and classified fly ash (fine fly ash, FA).

TL;DR: In this article, a self-compacting concrete (SCC) mixture was replaced with a Class C fly ash (FA) in various proportions from 30% to 60% and the results showed that 10% silica fume (SF) added to the mixture positively affected both fresh and hardened properties of high-performance high-volume FA SCC.

TL;DR: In this paper, the authors used X-ray diffraction to determine the lime carbonatation kinetics of bricks made of a mixture of lime and hemp shives and found that both thermal conductivity and mechanical properties increase with the mortar density.

TL;DR: In this article, the authors investigated the effect of using steel fiber and silica fume on the properties of concrete and found that the use of steel fiber increased both the mechanical strength and the modulus of the elasticity of concrete.

TL;DR: In this article, a study of the resistance to chloride penetration of blended Portland cement mortar containing ground palm oil fuel ash (POA), ground rice husk ash (RHA), and fine fly ash (FA) is presented.

TL;DR: In this article, a laboratory study of modified bitumen containing styrene-butadiene-styrene (SBS) and ethylene vinyl acetate (EVA) copolymers is presented.

TL;DR: In this paper, the influence of fly ash (FA) on the properties of self-compacting concrete (SCC) is investigated and the results indicate that high volume FA can be used in SCC to produce high strength and low shrinkage.

TL;DR: In this article, the results of a laboratory study of evaluating the fatigue characteristics of hot-mix asphalt (HMA) mixtures using different testing methods were presented, including indirect tensile strength (ITS), failure strain, toughness index (TI), resilient modulus, DCSEf, energy ratio, plateau value, and load cycles to failure.

TL;DR: In this article, the feasibility of recycled glass sand (RGS) and pozzolanic glass powder (PGP) in concrete as sand and cement replacement, respectively, was investigated.

TL;DR: In this article, the main corrosion initiation mechanisms are shortly presented and the propagation period and the main consequences on mechanical properties of steel and concrete are analyzed, and the experimental results show that with increasing duration of exposure to a corrosive environment, the steel mass loss increases appreciably.

TL;DR: In this paper, the properties of plain concrete and steel fiber reinforced concrete (SFRC) containing fibres of mixed aspect ratio were investigated, and various tests such as inverted cone time, Vebe time, compaction factor, and compressive strength, split tensile and static flexural strength tests were conducted.

TL;DR: In this article, three series of concretes with different compressive strength levels are presented, each series includes a reference concrete prepared with natural crushed stone and two RAC prepared with two coarse aggregates obtained by crushing a normal strength and a high strength concrete.

TL;DR: In this article, simply supported beams were tested using a free vibration method to determine the relationships between damping ratio in small deformation and the size as well as amount of rubber particles in rubberized concrete.

TL;DR: In this paper, the authors compared the properties of 12 alkali-activated mortars and a control ordinary portland cement (OPC) mortar, and found that the compressive strength development of alkali activated mortar was significantly dependent on the proposed alkali quality coefficient.

TL;DR: In this article, the authors studied the effect of the water to cement ratio (W/C), admixture and mixing time on porous concrete properties and showed that the strength of porous concrete could be estimated from strength equation of porous brittle material.

TL;DR: Wang et al. as mentioned in this paper developed two mixing approaches by adding silica fume into certain percentages of Recycled Aggregate (RA) in the pre-mix procedure, named as two-stage mixing approach (silica fUME) (TSMA s ) and adding silICA fume and proportional amounts of cement into certain percentage of RA in the first mix, named AS-TSMA sc, which showed that improvements have been recorded resulted from the use of various RA percentages from both TSMA s and TSMA sc.

TL;DR: In this article, the pore-structure coarsening can be regarded as the formation of equivalent cracks which should be responsible for the reduction in mechanical properties of hardened cement paste (hcp), especially when no chemical decomposition of hcp occurs below 400°C.

TL;DR: In this paper, the performance properties of crumb rubber modifier (CRM) in hot mix asphalt (HMA) pavement are considered to be unclear due to the various interaction effects of CRM with asphalt binders, depending on the CRM percentage, source and size.

TL;DR: In this paper, the results of an experimental campaign on FRP-concrete delamination have been presented, where specimens with different bonded lengths and plate widths have been tested.

TL;DR: Lightweight aggregates have been manufactured by sintering fly ash and crushing the product into suitable sizes as discussed by the authors, which make them suitable for high strength and high performance concrete, and they are shown to be around 22% lighter and at the same time 20% stronger than normal weight aggregate concrete.

TL;DR: An overview of several aspects of the weathering of roofing materials is presented in this paper, which can be attributed to biological growth (e.g., cyanobacteria, fungi, algae), deposits of organic and mineral particles, and to the accumulation of flyash, hydrocarbons and soot from combustion.

TL;DR: A PVA short fiber reinforced fly ash-geopolymer composites manufactured by extrusion technique (SFRGC) is developed in this paper, where the effects of fly ash content and fiber volume fraction on the rheological and impact behaviors of SFRGC are systemically investigated.

TL;DR: In this paper, the structural behavior of precast concrete sandwich panels (PCSP) under flexure is studied both experimentally and theoretically, and the effect of steel shear connector's stiffness on the ultimate strength and the compositeness of the panels is investigated.