Search

ABSTRACT The study presented in this paper aims at defining a procedure to study the efficiency of models used to extrapolate long-term shrinkage from experimental data. The approach allows estimating [...]

ABSTRACT In this paper, alkali-activated fly ash (geopolymer) samples were microstructurally analysed after thermal shock. The prepared samples were heated at 1000[degrees]C, and then quenched in water to room temperature. [...]

ABSTRACT This paper presents a summary of a study that focuses on assessing flexural behavior of pultruded glass-fiber-reinforced polymer (GFRP) composite profiles commonly used in bridge deck applications. In this [...]

ABSTRACT This paper develops a mechanical model to accurately predict the strength of Laminated Veneer Lumber (LVL) beams, and illustrates its applications to numerically predict the strength distribution of LVL [...]

ABSTRACT This paper deals with the analysis of indirect tensile resilient modulus (IT RM) tests for asphalt mixes. In Brazil, for instance, asphalt mix stiffness is obtained from a classical [...]

ABSTRACT This paper summarizes the state of research on the topic of shear strengthening of RC beams using externally bonded FRCM composites. In the first part of this paper, a [...]

ABSTRACT This paper presents an experimental verification and quantification of the cracking localization phenomenon in reinforced concrete (RC) tensile prismatic bars with steel fibers. The phenomenon is characterized by significant [...]

ABSTRACT Inter-particle effect and imperfect interface are the two major challenges during the micromechanical modeling of asphalt mixture due to its complex heterogeneity. This paper presents the development and validation [...]

ABSTRACT This paper investigates the mechanical behavior of a new type of ultra-lightweight cement composite (ULCC) with density less than 1400 kg/[m.sup.3] and strength up to 60 MPa after exposing [...]

ABSTRACT Field frost-thaw deformation tests show that the frost susceptibility of graded aggregate is a major factor contributing to the instability of high speed railway track. This paper is aimed [...]

ABSTRACT The objective of this paper is to present a newly-developed approach for discrete element simulation of realistic particle shapes in stone-based mixtures through a MATLAB-based imaging process and PFC5.0 [...]

ABSTRACT This paper presents the experimental results related with the compressive behavior of steel fiber reinforced-recycled coarse aggregate concrete (SFRCAC). Compressive strength, Young's modulus and stress-strain curves were carried out [...]

ABSTRACT An asphalt mastic imparts most of its characteristics to the asphalt concrete mixture and also dictates several forms of distresses in asphalt mixtures and pavements. Several studies have demonstrated [...]

ABSTRACT In this paper, the authors present a meso-macro numerical approach in order to determine macroscopic diffusivity tensors in heterogeneous quasi-brittle materials such as concrete. The meso-structure is based on [...]

ABSTRACT There is a growing awareness towards using materials with less social, economic and environmental impacts in the construction and rehabilitation of buildings. However, the evaluation of the sustainability of [...]

ABSTRACT Recently, relationship between fracture surface roughness and material's strength has received too much attention in literature. In this paper, 2D image is used as a novel and economic tool [...]

ABSTRACT This paper compares the European (EN) and US (ASTM) standard tests for the soundness of aggregates. The main purpose of the paper is to identify the differences between these [...]

ABSTRACT Dynamic biaxial tensile-compressive tests have been performed on dog-bone-shaped specimens of plain concrete under different tensile stresses and different strain rates, 100 mm x 100 mm x 100 mm [...]

ABSTRACT The objective of this paper is to investigate the effects of rejuvenator seal materials (RSM) on performances of hot asphalt mixtures (HMA). Firstly, frequency sweep test is conducted to [...]

ABSTRACT This paper discusses the results from an experimental investigation conducted to study the effect on using cellulose fibres as cement replacement on the properties of lightweight cement composite. The [...]

ABSTRACT The topic of this paper is the reaction of the glue--concrete interface of bonded anchors under tensile load. The analysis described in this paper is closely focused on the [...]

Alongside stiffness, strength, weight and durability, ductility ranks as one of the most important properties of structural materials. With its etymology in the latin word ductilis (the ability of metals [...]

The 7th International Seminar on Structural masonry for the developing countries was held in Bello-Horizonte, Brazil from the 18th to 20th September 2002. The seminar is a recognised forum, which [...]

ABSTRACT This paper concerns a new concept for introducing superabsorbent polymer (SAP) particles as pre-existing flaws into matrix to improve tensile property, flexural property, drying shrinkage and restrained shrinkage of [...]

ABSTRACT Based on a master-curve, mixture properties can be predicted or interpolated at different temperatures and loading times of interest from a limited set of laboratory test data. This paper [...]

ABSTRACT Construction with natural soils is becoming more and more popular due to new geoenvironmental approaches. In this context, this paper presents initially several experiments performed on the Missillac sand [...]

ABSTRACT This paper proposes a V-shaped cone model to modify the Kelvin equation and thus obtaining an accurate connection between the effective aperture of hygroscopic material and its governing factors. [...]

ABSTRACT Surface bughole of concrete is one of surface imperfections of concrete appearance, and the detection and evaluation of surface bugholes have always been a difficult problem. This paper established [...]

ABSTRACT This paper focuses on examining the uniaxial behaviour of concrete materials incorporating rubber particles, obtained from recycled end-of-life tyres, as a replacement for mineral aggregates. A detailed account of [...]

ABSTRACT Present paper evaluates the performance of expansive conventional concretes and expansive SCC, their physic-mechanical and microstructural properties, and their uniaxial restraining expansion regime, under different both restraining and curing [...]

ABSTRACT In this paper, using a large database from the Long Term Pavement Performance program, the authors developed an Artificial Neural Network (ANN) to estimate the structural performance of asphalt [...]

ABSTRACT This paper describes the development of finite element (FE) models for the study of the behaviour of unreinforced and basalt fibre reinforced polymer (BFRP) externally reinforced masonry walls under [...]

ABSTRACT The research presented in this paper deals with the impact behavior of steel fiber-reinforced concrete (SFRC). An experimental campaign on unnotched prismatic specimens has been carried out, covering three [...]

ABSTRACT This paper investigates blast resistance and residual strength of concrete-filled steel tube (CFST) columns under close-range blast loads. A total of 8 CFST columns, including 4 with circular cross [...]

ABSTRACT Due to the difficulties of direct tensile testing on concrete, only limited and often conflicting data are available. In this paper, to investigate the effect of loading frequency on [...]

The research for the features of similar material mechanics, the law of acoustic emission (AE) responses and fracture evolution characteristics can reflect the regularity of deformation, stress and fracture of coal and rock, revealing the evolution mechanism of dynamic disasters. We studied the mechanical properties of loaded sand-paraffin (SP) samples associated with different mixture ratio and the damage evolution of internal cracks based on AE. Results show that (1) with the increase of paraffin content, mechanical parameters of SP samples including compressive strength, elastic modulus, tensile strength, Poisson's ratio and internal friction angle show the overall upward trend, while failure pattern transitions to wedge splitting type and brittle shear failure from extrusion powder flexible broken; (2) the AE test can reflect the internal damage degree of SP samples and law of its space-time evolution. Along with the load increase, the AE response can be divided into three stages: slow growth, rapid growth and saturation, while also the damage variable reduces first then increases rapidly and grows slowly at last; (3) using the quadratic polynomial fitting, fragment expressions of damage evolution mechanism of SP are obtained. Based on Weibull distribution, we get the AE parameters (cumulative pulses) coupling mechanical parameters (stress and strain) expression, which fits better with the experimental data. By studying the mechanical parameters, the main failure form, AE response characteristics and its internal damage evolution rule, the paper evaluate the mechanical properties of the SP material from the macroscopic appearance to the microscopic mechanism, which provides the scientific basis for better selection and matching the material of analog simulation. Keywords: Similar material simulation Material ratio Mechanical properties AE response Damage evolution, 1. Introduction The technology of similar material simulation is a simple and intuitive physical research method. With reasonable similarity ratio, properties of rock and soil can be simulated including the [...]

ABSTRACT The objective of this paper is to examine the hydration behaviour, fluidity and drying shrinkage of cement paste with lower water-cement ratio (W/C) of 0.25. The electrochemical technique is [...]

ABSTRACT Cracks may indicate structural problems in constructions made of timber beams, but their identification in notably roof constructions is difficult. Therefore this paper presents an algorithm for the automatic [...]

The paper explored the physical and statistical relationships between different low-temperature performance parameters of asphalt binders. First of all, a physical equation between the creep stiffness S(t) and creep rate m(t) at any time t was established through mathematical deduction, the geometric and physical meaning of the equation was explained, and then a method considering S and m-value (which are creep stiffness and creep rate at t = 60 s, respectively) synthetically to choose binders with better lowtemperature performances was put forward on the base of the equation. Secondly, based on the bending beam rheometer (BBR) test results of rubberized warm asphalt studied, the paper verified the physical relationship, and further showed how to select a type of asphalt binder according to the S and m-value. Besides, the statistical relationships between low-temperature performance parameters and other parameters were investigated, and the analysis results show that there exist a good linear correlation between m-value and relaxation time, m-value and dissipation energy ratio, relaxation time and dissipation energy ratio, dissipation energy and m/S, and the m/S and ratio of dissipated energy to the 0.5 power of storage energy, respectively. Keywords: Creep stiffness S(t) Creep rate m(t) Burger's model parameters Physical equation Rubberized warm asphalt (RWA) Dissipated energy Storage energy Dissipated energy ratio Correlation, 1. Introduction Traditionally, low-temperature properties of binders are characterized using standardized and/or modified standardized test methods, such as low-temperature penetration, low-temperature ductility and Fraass breaking point [1]. However, these methods [...]

ABSTRACT The application of FRP to the strengthening of existing reinforced concrete structures entails the inevitable exposure of the layered structure to temperature changes. This paper takes another step in [...]

ABSTRACT Fatty acids are increasingly being evaluated as phase change materials to enhance thermal regulation in buildings and as hydrophobic admixtures to reduce water ingress into concrete. This paper describes [...]

ABSTRACT This paper presents the shear behavior and a crack-shear slip model of high-strength steel fiberreinforced concrete based on a push-off test. The parameters were the compressive strength of the [...]

ABSTRACT Although an earlier developed numerical methodology for permeability estimation of cement pastes can provide satisfactory results in comparison with experiments, it would be of engineering interest to find a [...]

ABSTRACT This paper presents a summary review of research performed on the mechanical behavior of concrete-filled steel tube members and frames made from recycled aggregate concrete (RAC). The paper begins [...]

ABSTRACT An infrared thermometer can be used to detect the temperature of materials not in-contact, in situ and in real-time measurement. The set emissivity is key to obtaining the accurate [...]

ABSTRACT The proportion of anhydrous cement in materials is essential data in relation to reactivity potential, particularly in by-products that may be reused it in concrete techniques. This paper presents [...]

ABSTRACT This paper presents results of an experimental investigation on the effect of moisture transport on chloride penetration in partially saturated concrete. The paper includes the development of an experimental [...]

ABSTRACT The seismic behavior of steel reinforced ultra-high strength concrete (SRUHSC) and steel reinforced normal-strength concrete (SRNSC) frames is experimentally investigated in this paper. For this purpose, two one-fourth scale, [...]

ABSTRACT This paper presents and discusses the results of experimental tests performed on concrete specimens internally reinforced with polypropylene and steel fibers. Specifically, samples of five mixtures (plus a reference [...]

ABSTRACT Feedback on the use of a sub-ballast bituminous layer in a ballasted high-speed line (HSL) is evaluated in this paper. Conclusions are drawn on the relation between the thermo-viscoelastic [...]