Construction and Building Materials articles from March 2007

Construction and Building Materials archives from March 2007

Preface.
March 1, 2007... In order to promote studies for understanding, engineering and monitoring durability of concrete structures and to exchange the scientific interest and ideas on the updated topics associated with fracture, acoustic emission (AE) and...

Compressive failure in concrete of recycled aggregate by acoustic emission.
March 1, 2007... Abstract For recycling concrete, the use of recycled aggregate has been extensively studied in Japan. It is widely recognized that compressive strength in concrete of recycled aggregate is lower than normal concrete with the same...

Acoustic emission parameters correlated with fracture and deformation processes of concrete members.
March 1, 2007... Abstract Acoustic emission (AE) techniques is extensively applied to a variety fields in civil engineering. Currently a new generation of AE technique, which is able to register and process AE data in real-time, has appeared. Still, there...

Acoustic emission for monitoring a reinforced concrete beam subject to four-point-bending.
March 1, 2007... Abstract Acoustic emission (AE) analysis is applied to monitor the deterioration progress of a reinforced concrete beam under loading in a laboratory test. Accuracy of AE locations is discussed. Picking of signal onsets was done using an...

Detection and evaluation of failures in high-strength tendon of prestressed concrete bridges by acoustic emission.
March 1, 2007... Abstract Failures in high-strength steel tendons of prestressed concrete structures are becoming a serious problem, as the deterioration of structures progresses due to aging. The failure is mainly attributed to the corrosion induced in...

Site installation and testing of a continuous acoustic monitoring.
March 1, 2007... Abstract In recent years much experience has been gained with continuous acoustic monitoring of monostrands and stay cables. However, there is little knowledge with monitoring of post-tensioned bridges with bonded tendons. An acoustic...

Dynamics of spall failure in fiber reinforced concrete due to blasting.
March 1, 2007... Abstract Dynamic failure in fiber-reinforced concrete (FRC) slabs was studied experimentally and analytically. Due to blasting, damaged areas were created in the specimens, as the crater at the top surface and as the spall at the bottom....

BEM analysis of dynamic behavior of concrete in impact-echo test.
March 1, 2007... Abstract The impact-echo method is well known as a non-destructive testing for concrete structures. Taking out resonant frequencies responsible for locations of reflectors in frequency spectra, locations of reflectors are determined. In...

Identifying voids in plastic ducts in post-tensioning prestressed concrete members by resonant frequency of impact--echo, SIBIE and tomography.
March 1, 2007... Abstract A series of standard concrete beams with plastic P-T tendon ducts were tested at the University of Edinburgh using a range of NDT techniques including impact--echo (I-E), stack imaging of spectral amplitudes based on the...

Influence of nano-Si[O.sub.2] addition on properties of hardened cement paste as compared with silica fume.(Regular Papers)
March 1, 2007... Abstract The influence of nano-Si[O.sub.2] (NS) addition on properties of hardened cement paste (hcp) as compared with silica fume (SF) has been studied through measurement of compressive and bond strengths of hcp, and by XRD and SEM...

Comparative assessment of isophtalic and orthophtalic polyester polymer concrete: different costs, similar mechanical properties and durability.(Regular Papers)
March 1, 2007... Abstract This study aims to investigate the effect of different concentrations of fly ash on the mechanical properties and durability of polymer concrete compounds prepared with low concentrations of resins. Two different binders were...

Experimental study on smoke movement leading to glass damages in double-skinned facade.(Regular Papers)
March 1, 2007... Abstract Fire hazard of the new architectural feature--double-skinned facade was examined experimentally. Full-scale burning tests on part of the design feature were carried out in a facility developed in a remote area in Northeast China....

Creep characteristics of asphalt modified by radial styrene--butadiene--styrene copolymer.(Regular Papers)
March 1, 2007... Abstract The aim of this work was the comparison of estimated zero-shear viscosity (ZSV) from both parts of the creep and recovery curve with directly measured ZSV, for asphalt modified with different amounts of radial...

New construction material from concrete production and demolition wastes and lime production waste.(Regular Papers)
March 1, 2007... Abstract New construction materials were developed and patented in Brazil, based on concrete production and demolition wastes mixed with lime production waste. The main objective of this research is to utilize these two types of industrial...

Improving the compressive strengths of cold-mix asphalt using asphalt emulsion modified by polyvinyl acetate.(Regular Papers)
March 1, 2007... Abstract Rut is the type of flexible pavement distress mostly occurring in Mexico, generally caused by exceedingly heavy axle loads. Therefore, the compressive strengths of cold-mix asphalt (CMA) must be improved, for this reason a...

Modeling the pavement serviceability ratio of flexible highway pavements by artificial neural networks.(Regular Papers)(Company overview)
March 1, 2007... Abstract The term "present serviceability" was adopted to represent the momentary ability of pavement to serve traffic, and the performance of the pavement was represented by its serviceability history in conjunction with its load...

Weathering effects on external wall tiling systems.(Regular Papers)
March 1, 2007... Abstract External wall tiles are subject to severe weathering effects, including wind, rain, moisture and pollutants-attack. However, how is the tiling system affected by the weathering effects is unknown so far. This is probably the first...

Experimental study of hybrid composite beams.(Regular Papers)
March 1, 2007... Abstract In this study, a new type of hybrid confining device, a perforated steel tube that is externally protected by a thin fiber reinforced polymer skin is proposed and experimentally investigated. Hybrid composite beams were fabricated...

Organo-modified reservoir sludge as fine aggregates in cement mortars.(Regular Papers)
March 1, 2007... Abstract In Taiwan, a considerable amount of reservoir sludge is being increasingly difficult to dispose of in landfills and creates serious disposal problems. Attempts have been made to study the feasibility of using reservoir sludge as a...

Evaluation of marble waste dust in the mixture of asphaltic concrete.(Regular Papers)
March 1, 2007... Abstract In the study the use of marble dust collected during the shaping process of marble blocks has been investigated in the asphalt mixtures as filler material. The samples having marble dust and limestone dust filler were prepared and...

Deformation adjustment of concrete beams laminated with carbon fiber mats.(Regular Papers)
March 1, 2007... Abstract A carbon fiber mat is a sheet composed of intercrossing short carbon fibers, which has more stable and lower electrical resistivity compared with dispersed short carbon fiber mixed in cement. Thereby carbon fiber mats can be used...

Laboratory investigation of the properties of asphalt concrete mixtures modified with TOP--SBS.(Regular Papers)
March 1, 2007... Abstract Benefits of adding Tall oil pitch (TOP), Styrene-butadiene-styrene (SBS) and TOP + SBS to AC-10 in variant quantities to AC-10 were investigated. Initial research was done to determine the physical properties of asphalt cement and...

Effect of environmental conditions on the properties of concretes with different cement types.(Regular Papers)
March 1, 2007... Abstract The paper reports on the changes in properties of concretes with different cement types associated with environmental conditions. Three strength classes with three different cement types (ordinary portland cement PC 42.5 (CEM I...

Potable water filtration sludge: use as set retarder in one-coat plastering mortars.(Regular Papers)
March 1, 2007... Abstract This work describes the study of the potential use of the sludge generated in potable water filtration/cleaning operations (waste material) as set retarder and workability-aid in rendering/plastering mortars. A commercial mortar...

Effects of steel fiber addition on mechanical properties of concrete and RC beams.(Regular Papers)
March 1, 2007... Abstract C20 and C30 classes of concrete are produced each with addition of Dramix RC-80/0.60-BN type of steel fibers (SFs) at dosages of 0 kg/[m.sup.3], 30 kg/[m.sup.3], 60 kg/[m.sup.3], and their compressive strengths, split tensile...

Effect of the addition of wood shavings on thermal conductivity of sand concretes: experimental study and modelling.(Regular Papers)
March 1, 2007... Abstract This work aims at the valorisation of local materials and the reuse of various wastes. The main objective of this research is to constitute a structural lightweight sand concrete and to improve its thermal properties while...

The effect of thiosemicarbazide on corrosion resistance of steel reinforcement in concrete.(Regular Papers)
March 1, 2007... Abstract This study describes a laboratory investigation of the influence of thiosemicarbazide (TSC) on the corrosion of reinforcing steel and the compressive strength of concrete. The effect of TSC on the corrosion resistance of steel...

Response of pre-cast reinforced composite sandwich panels to axial loading.(Regular Papers)
March 1, 2007... Abstract This paper summarises the results of an experimental and numerical study of precast reinforced composite sandwich panels. Full-scale tests were carried out to determine their axial strength capacity. Load--deformation response,...

Usage of industrial by-products to produce plain concrete elements.(Regular Papers)
March 1, 2007... Abstract This paper describes the results of research aimed at studying the possible usage of bottom ash (BA) and granulated blast-furnace slag (GBFS) in production of plain concrete elements. Sufficient number of briquettes, paving blocks...

Calendar.(Calendar)
March 1, 2007... Calendar Date and Event venue 2007 5th International Conference on 1-2 March Construction Project Management ...