Showing papers in "Construction and Building Materials in 2009"

TL;DR: In this paper, a review brings together research on life cycle assessment (LCA) applied within the building sector, focusing on the LCA methodology and tools employed in the built environment.

TL;DR: In this article, the authors analyzed data from experimental works carried out in CEDEX and also from literature review to obtain experimental relationships between the attached mortar content and other recycled aggregate properties, covering a wide range of different aggregates qualities.

TL;DR: In this paper, the authors investigated the strength of concrete made with recycled concrete coarse aggregate and found that the tensile strength of recycled concrete can be 10-25% lower than that of conventional concrete made using natural coarse aggregate.

TL;DR: In this article, the performance of concrete mixtures incorporating 5%, 7.5% and 10% of discarded tyre rubber as aggregate and cement replacements was investigated, and the results showed that with up to 5% replacement, in each set, no major changes on concrete characteristics would occur, however, with further increase in replacement ratios considerable changes were observed.

TL;DR: In this article, the authors reviewed the chloride binding of cement-based materials subjected to external chloride environments and proposed four different types of binding isotherms to describe the relationship between free and bound chloride.

TL;DR: Amorphous nano-silica (nS) particles were incorporated in cement pastes and mortars, and their effect on the fresh state behavior was analysed as mentioned in this paper, where the influence of nS content was better observed on yield stress when compared with plastic viscosity values (the first increased about 66.5% while the latter just increased 3.6%).

TL;DR: In this paper, the properties of recycled aggregates derived from parent concrete (PC) of three strengths, each of them made with three maximum sizes of aggregates, were discussed.

TL;DR: In this article, the suitability of using more sustainable concrete for wind turbine foundations and other applications involving large quantities of concrete was investigated, which was accomplished by partial replacement of cement with large volumes of fly ash or blast furnace slag and by using recycled concrete aggregate.

TL;DR: Puertas et al. as mentioned in this paper investigated the feasibility of using and alkaline activated ground Turkish slag to produce a mortar without Portland cement (PC) by using three different activators: liquid sodium silicate (LSS), sodium hydroxide (SH) and sodium carbonate (SC) at different sodium concentrations.

TL;DR: In this paper, concrete specimens were manufactured by completely replacing fine and coarse aggregates with recycled aggregates from a rubble recycling plant, and they were evaluated by means of compressive strength and modulus of elasticity in the first experimental part.

TL;DR: In this paper, the influence of aging on the evolution of structure, morphology and rheology of base bitumen and SBS modified binders was investigated by Fourier transform infrared (FTIR), atomic force microscopy (AFM) and dynamic shear rheometer (DSR), respectively.

TL;DR: In this article, the authors evaluated the properties of concrete made with crushed bricks replacing natural aggregates and found that the results indicated that ceramic residuals could be used as partial replacement of natural aggregate without reduction of concrete properties for 15% replacement and with reductions up to 20% for 30% replacement.

TL;DR: In this paper, the main aim of this work was to determine creep and shrinkage variations experienced in recycled concrete, made by replacing the main fraction of the natural aggregate with a recycled aggregate coming from waste concrete and comparing it to a control concrete.

TL;DR: In this paper, a durability-based multi-objective optimization of the mixtures were performed to achieve an optimal concrete mixture proportioning, and the results indicated that when the durability properties of the concretes were taken into account, the ternary use of S and SF provided the best performance.

TL;DR: In this paper, a comparative rheological test on the unmodified and nanoclay modified bitumen was conducted by dynamic shear rheometer (DSR) on modified and unmodified bitumen.

TL;DR: In this article, the effect of waste marble dust (MD) usage as filler material on capillarity properties of self-compact concrete (SCC) is investigated. And the results showed that the workability of fresh SCC has not been affected up to 200 kg/m3 MD content.

TL;DR: In this article, the properties of reactive powder concrete (RPC) produced with class-C fly ash (FA) and ground granulated blast furnace slag (GGBFS) were investigated under different curing conditions (standard, autoclave and steam curing).

TL;DR: In this paper, a two-stage crushing process was utilized to produce recycled aggregate (RA) and the slump of concrete mixes prepared by technique of stone enveloped with pozzolanic powder (SEPP) was compared with those using normal mixing approach (NMA) or stone enveloping with portland cement (SEPC) approach.

TL;DR: In this article, the physical properties of concrete containing ground bagasse ash (BA) including compressive strength, water permeability, and heat evolution, were investigated, and it was shown that concrete samples containing 10-30% ground basse ash by weight of binder had greater compressive strengths than the control concrete.

TL;DR: In this article, the development of lightweight aggregate concrete using fine aggregate that is manufactured from recycled waste polyethylene terephthalate (PET) bottles was presented, and the results of the first phase showed that the WPLA had a density of 1390kg/m3, a water absorption of 0% and a bulk density of 844 kg/m 3.

TL;DR: In this paper, local unprocessed steel slag is introduced in concrete mixes, which is used as fine aggregate replacing the sand in the mixes, partly or totally, to enhance the strength of concrete, especially tensile strength, provided the correct ratio is used.

TL;DR: In this paper, the results of the processing of sugar cane bagasse ash (SCBA) under controlled calcination conditions in order to obtain materials with optimum pozzolanic activity were presented.

TL;DR: In this paper, the use of ground palm oil fuel ash with high fineness (GPA) as a pozzolanic material to produce high-strength concrete was investigated.

TL;DR: In this paper, the thermal and sound properties of crumb rubber concrete panels were investigated, and it was shown that crumbs from used tires, produced in a local recycling plant, were used to replace fine aggregate at ratios of 10, 20, and 30%.

TL;DR: In this paper, the authors compared the properties of concretes prepared with the use of river sand, crushed fine stone (CFS), furnace bottom ash (FBA), and fine recycled aggregate (FRA) as fine aggregates.

TL;DR: In this paper, the authors describe the acoustic emission behavior of concrete under four-point bending and show that the total acoustic emission (AE) activity is directly proportional to the fiber content.

TL;DR: In this article, an artificial neural network (ANN) was used to predict the 28-day compressive strength of self compacting concrete (SCC) and high performance concrete (HPC) with high volume fly ash.

TL;DR: In this paper, the effects of organo-montmorillonite (OMMT) on thermo-oxidative and ultraviolet (UV) aging properties of asphalt were investigated, and the results showed that the viscosity aging index (VAI) and softening point increment (Δ S ) of OMMT modified asphalt decrease significantly due to introduction of OMMT and the ductility retention rate of the modified asphalt is also evidently higher than that of the pristine asphalt after thin-film oven test (TFOT) and pressure aging vessel (PAV) aging.

TL;DR: In this paper, the authors examined the conductivity of asphalt mortar through the addition of electrically conductive fillers and fibers: graphite and steel wool, and proved that this material can be heated with induction energy.

TL;DR: In this paper, the use of autoclaved calcined phosphogypsum (PG) for making load-bearing wall bricks was investigated. And the results showed that the flexural strength and compressive strength of the bricks could reach 4.0 and 15.0 MPa, respectively.