... their mechanical properties. This paper presents a spherical diffusion–carbonation model to simulate carbon dioxide transport and its reaction with cementitious materials involved in RCAs by taking into account their typical spherical geometry – a feature frequently neglected in traditional slab-based approaches...

... with 100% PC and binary mortars with 5%, 10% and 15% SF . These mortars were cured for 180 days. The HydCem model, the Powers model and the modified Powers model were used to describe the volumetric evolution of hardened pastes during 1250 days of hydration. The compressive strength and total porosity...

...Thomas Dyer An experimental programme was conducted to observe, non-destructively, the influence of aggregate particle size and low water/cement (w/c) ratios on alkali–silica reaction (ASR) in concrete using micro-computed tomography scanning. The results were analysed using a model developed...

... modify the chemical and microstructure properties of concrete and thus will have important effects on chloride diffusion. This paper presents a chloride diffusion model in which the concrete cover is divided into three different zones, each with their own defined porosity and chloride binding isotherm...

... properties of NPC. Additionally, a pore damage model was established, and the pore damage threshold was also calculated based on the experimental results. The obtained damage threshold of pore structure can provide the theoretical foundation for the application of NPC in cold regions. Freeze–thaw damage...

... geometrical pores. The newly produced porous samples can be used as light concrete in building. aggregates light weight modelling porous material thermal conductivity coefficient It is a challenge to calculate the thermal conductivity coefficients of heterogeneous materials with pores...

... of fibres (steel and polypropylene). A total of nine GHFRC specimens with a diameter of 250 mm and a height of 1150 mm were fabricated and tested to failure. A three-dimensional finite element model (FEM) was developed for the GHFRC specimens using ABAQUS 6.14. The definition of hybrid-fibre-reinforced...

...Wen-Liang Qiu; Rong-Xin Peng The non-linear performance of concrete is determined by the heterogeneous micro-structure of concrete. The existing methods mainly focus on numerical simulation of concrete at meso-scale. In view of this, the micro-calculation model based on bond-based peridynamics...

...Suresh Kumar Padala; Shashank Bishnoi; Bishwajit Bhattacharjee The depth of concrete influenced by seawater penetration plays a vital role in many durability processes affecting reinforced concrete structures in the marine tidal zone. In this study, a phenomenological moisture transport model...

... transport in concrete, a chloride transport model was established and verified by experiments. Chloride profiles in damaged concrete were related to temperature, temperature gradient, relative humidity and humidity gradient. The chloride attack rate decreased with increasing concrete damage and exposure...

...Rachel M. Homer; David W. Law; Thomas C.K. Molyneaux The corrosion of steel due to chloride ingress is one of the major causes of deterioration of reinforced concrete structures. In order to ensure a structure achieves the design life specified, predictive modelling is employed. To undertake...

...Van Quan Tran, PhD Chloride ingress into concrete was simulated based on a geochemical model that includes Fick's second law for transport phenomena and thermodynamic equilibrium, kinetics treatment and surface complexation for chemical phenomena. The geochemical model was validated by comparing...

...Rodrigo Vilela Gorga; Leandro FM Sanchez; Beatriz Martín-Pérez; Martin Noël Modelling the expansion and damage generated by alkali–aggregate reaction (AAR) in reinforced concrete structures is quite complex, yet necessary to obtain accurate predictions of the structural response of distressed...

... Analysis in Higher Evaluation System Technology), is used to carry out all the seismic analyses of reinforced concrete wall piers. The wall piers were modelled using a combination of reinforced concrete shell elements and newly developed interface elements with six degrees of freedom. The reinforced...

... as to measure expansion. A model, based on the progressive formation of cracks in concrete, is developed and used to further examine the process of ASR, and the manner by which approaches used to control ASR expansion function. It is concluded that ASR-controlling measures work by reducing available alkali ions...

...Federico Accornero; Renato Cafarelli; Alberto Carpinteri In the present work, cohesive and overlapping crack models are integrated in a comprehensive numerical algorithm in order to investigate both tensile and compressive failures in plain or steel-bar reinforced concrete (RC) structural elements...

... be calculated through the thickness of the damaged layer obtained by ultrasonic theory, and models of Vickers hardness distribution and compressive strength prediction based on equivalent Vickers hardness were proposed to evaluate the performance of frozen concrete with high accuracy. This potentially provides...

...Solomon Oyebisi; Hilary Owamah; Thamer Alomayri; Anthony Ede This study models the flexural strength of concrete modified with cashew nutshell ash (CNA) using reactivity index concepts. Cashew nutshell was valorised and its ash was used at 5, 10, 15 and 20 wt.% of cement via mix proportions...

... concrete composites in the experimental programme were given as input variables in artificial neural network models. The constituents of concrete, such as cement, fly ash, silica fume, sand, coarse aggregate, water, chemical admixture, steel fibre, polyester fibre and its combinations, were used as input...

... that a portion of the tensile stress in the reinforcement at each crack is transferred back into the concrete between adjacent cracks. This mechanism stiffens the concrete in tension and is referred to as tension stiffening. This paper presents a generalised tension stiffening model developed for limited ductile...