The influence of burnt clay brick waste addition on recycled brick
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International Journal of Pavement Research and Technology Journal homepage: www.springer.com/42947
The influence of burnt clay brick waste addition on recycled brick Nfor Clins Wiryikfua,b*, Christian Bopda Fokama, Bienvenu Kenmeugnea, Théodore Tchotanga a
Laboratory of Engineering Civil et Mécanique, National Advanced School of Engineering (ENSPY/UY1), University of Yaounde 1, Cameroun b Local Material Promotion Authority (MIPROMALO) Yaoundé, Cameroun Received 14 May 2020; received in revised form 26 September 2020; accepted 1 October 2020
Abstract
Ceramic materials especially clay soil (CS) have been used in construction for decades now. This CS has been used either unmixed or mixed with several other constituent materials to produce materials with interesting engineering properties. The study in this paper is a contribution to the re-use of broken burnt clay bricks (BCB) by mixing it in various proportions and different grain sizes (0.08 mm to 0.1 mm and 0.25 mm to 0.5 mm) with the initial CS to produce useable bricks. Physical properties (density, porosity and water absorption) and mechanical properties ( compressive strength and flexural strength) of the resulting brick are then analyzed. The formulations of these products are done using the following percentag es of burnt clay powder (BCP): 0% (reference brick), 20%, 40% and 50%. Whatever the grain size of the samples, the results show a decrease in density (from 1.86 g/cm3 to 1.2 g/cm3) and in the water absorption rate with the burnt clay (BC) content. There is also a decrease in the compressive strength and fle xural strength of the bricks with the amount of burnt clay. The loss of mechanical resistance in compression between the reference sample and the highly loaded on e (50% burnt clay) is 37.86%, for the flexural strength it is 64.52%. Nevertheless, a small addition of BC (20%) reduces the loss in resistance to 17.4% for compression and 10.7% for flexural strength. Equally, there is an increase in the mechanical strength of the samples with decrease in grain size. T he studies carried out shows that a small quantity of burnt clay waste (20 %) of the finer grain size can result in bricks with properties similar to those of the reference brick. Keywords: Clay mixtures; gran size; Waste brick powder; Density; Mechanical property
1. Introduction Burnt clay bricks (BCB) have been used in construction for more than 8000 years before Christ [1]. These bricks are obtained by extruding moist ground clay through various moulds and then sintered at different temperatures sometimes as high as 1350°C [2]. These bricks are of great importance in house construction, petroleum factories, ovens, ironfoundry etc. Fired clay bricks mostly have better construction engineering properties than locally made sun dry bricks, though to an extend are lower in strength and life span than cement blocks [3]. To make up these strength and duration characteristics, many other materials (additives) are usually added to ameliorate, conserve or decrease the quality of these bricks [
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