It is shown that every 'proper-hypergeometric ' multisum/integral identity, or q-identity, with a fixed number of summations and/or integration signs, possesses a short, computer-constructible proof. We give a fast algorithm for finding such proofs. Most of the identities that involve the classical special functions of mathematical physics are readily reducible to the kind of identities treated...

This paper presents a numerical study on the mechanism of chloride migration in concrete. Unlike most of existing work, this study utilises multicomponent ionic transport models to reflect the influence of ionic interactions by coupling both mass conservation and Poisson’s equations. A series of 2-D, 3-phase models with different shapes and volume fractions of aggregates are developed to simula...

This article is devoted to the study of combined effect siliceous fly ash (FA), silica fume (SF), and nanosilica (nS) on cement matrix morphology size microcracks occurring in Interfacial Transition Zone (ITZ) between coarse aggregate paste concrete composites based ordinary Portland (OPC). The manuscript contains analyses width (Wc) ITZ area concretes quaternary blended cements changes questio...

In recent years, with the rapid development of coal-mining industry, output gangue has increased at a faster pace, while its utilization remains relatively low. The accumulation large amount brought about environmental problem. order to improve rate waste gangue, and solve secondary problems caused by pollution, this paper conducted research on an economic environmentally friendly gangue-based ...

• A meso -scale phase filed model for concrete cover cracking induced by corrosion of multiple reinforcements is developed. The crack patterns and width development are obtained. developed method enables high fidelity numerical models with up to tens millions degrees freedom. Crack deflection, aggregate/mortar bridging bifurcation in have been captured the model. Corrosion-induced one major det...

With the depletion of natural resources, it is essential to use recycled materials and industrial wastes adapt expanding building sector environment. Slag from electric arc furnaces one example that can be used as a siderurgical aggregate in concrete production. Studying interfacial transition zone between binder necessary because reaction significantly impact concrete's microstructure mechanic...

Paracoccidioidomycosis (PCM), one of the most important systemic mycoses in Central and South America, is caused by the dimorphic fungus Paracoccidioides brasiliensis and has a high prevalence in Brazil. Glycoproteins of 43 and 70 kDa are the main antigenic compounds of P. brasiliensis and are recognized by Western blotting by 100 and 96% of PCM patient sera, respectively. In the present study,...

This article is an extended version of the conference paper “Influence silica fume on mechanical and fracture properties high performance concrete” published in Procedia Structural Integrity as a part Special Issue for 3rd International Conference (ICSI 2019). Tests were carried out to evaluate compressive strength, tensile splitting modulus elasticity, flexural concretes (HPC) having different...

A comprehensive mesoscopic investigation has been conducted to examine the evolution of fracture process zone (FPZ), using notched plain concrete beams subjected three-point bending as a generic representation. The are modelled random heterogeneous materials containing three components, namely coarse aggregates, mortar and interface transition (ITZ). To better represent in concrete, coupled coh...