Papers by Keyword: Brickwork

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Authors: Ibrahim Mohamad H. Wan, B.H. Abu Bakar, M.A. Megat Johari, P.J. Ramadhansyah
Abstract: This paper presents the behaviour of moisture movement of calcium silicate brick masonry walls exposed to sodium sulphate environment. The walls were exposed to three sodium sulphate conditions with sulphate concentrations of5%, 10% and 15%. For comparison, some walls were also exposed to dry and wet condition which acts as a control conditions. All specimens were prepared and cured under polythene sheet for 14 days in a controlled environmental room and maintained at relative humidity and temperature of 80 ± 5% and 25 ± 2°C, respectively. After the curing period, the specimens were exposed to sodium sulphate as well as drying and water exposures, during which moisture movement was measured and monitored for a period of up to 7 months. As a result, the moisture expansion was observed and recorded for all masonry wall specimens after exposed to the sulphate condition.
Authors: Yi Fang Wang
Abstract: According to an evaluation on a six story, brick residential building with severe cracks and inclination, the influence of uneven soft subsoil on building was analyzed. Such damaged wall could be avoid, if the treatment to the basement and subsoil is correct in design and the brickwork is regulated strictly in construction. In order to minimizing the lost and keep the building safety, influence of uneven soft subsoil on buildings should be taken into account much more seriously, not only in design, but also in the construction process.
Authors: Francesca Sciarretta
Abstract: The paper addresses the issues of fire behavior of masonry walls made of traditional/historical component materials (bricks and mortar).There are reasons for coupling investigations on the residual mechanical properties to fire resistance data, aiming at a more complete knowledge of the behavior of a masonry member during and after fire exposure. The paper proposes a numerical approach via FEM to the problem of residual mechanical performance of load-bearing fire-separating masonry walls after insulation failure. The goal is to establish relationships between fire resistance ratings under exposure and decay in mechanical properties after exposure; the parameter of wall thickness is especially investigated. This is performed by means of FEM analysis, simulating a standard ISO 834 fire resistance test followed by a mechanical compressive failure test on each investigated type of wall. First, a preliminary transient heat flow analysis gives a numerical prediction of fire resistance after violation of I (Insulation) criterion; then, a staggered heat flow - stress analysis repeats the heating of the wall up to insulation failure and calculates the thermal strain accounting for cracking; finally, a 'cold' structural analysis in compression is performed on the thermally-deformed model after cooling. The comparison of numerical outcomes to available experimental information allows to judge the reliability of the numerical approach in reproducing the residual behavior of a masonry wall after fire exposure.
Authors: Mikhail Zapoyev, Sergey Aleksandrovich Krivoy, Svetlana Belyaeva
Abstract: Brickwork is one of the most convenient of enclosures. It combines supreme thermal insulation, durability, aesthetic appearance. However, masonry is subjected to plurality of destructive factors, one of which is salt corrosion. Survey of buildings of Saint-Petersburg has been described in this article. Experimental data that proves vulnerability of mortar to salt efflorescence has been obtained. Several solutions of this problem have been recommended and necessity of future researches has been stated.
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