Abstract
The aim of this study is to present the results of breaking strength tests for burnt clay bricks from various historical deposits. The native clay bricks production technique is the known method of brick making, particularly in South Asian countries. Numerous studies have been conducted on hand-molded formed bricks. The clay bricks that were considered for the comparative study, were made from four different clays sources. Their breaking strength was determined using for examining the maximum load at failure and the effects were investigated subsequently. The basic objective of this experimental study was to compare the breaking strength of locally fired clay bricks using a novel based completely randomized design via a single factor with four levels of clay sources representing the factors. For this purpose, 24 brick samples were made from four different clay sources while the breaking strength of each sample was measured. Pairwise comparison trials, including Duncan’s multiple range, Newman–keuls, Fisher’s least and Tukey’s tests were conducted. Based on experimental investigations, the results revealed that using analysis of variance at 95% CI, the difference in breaking strength between clay source of Hyderabad (A) and Rawalpindi (B), followed by Kohat (C) and Peshawar (D) was significant and also the difference among the means of these clay courses was significant which clearly exposed that the clay site and chemical composition has a great impression of the breaking strength of the burnt bricks.
Highlights
A good burnt clay brick should be hard enough, well scalded, sound in texture and sharp in outline and measurement and should not break definitely
In this study it was assumed that the lower level of breaking strength is due to the poor quality of clay used
For the purpose of investigation four different clay samples were collected from four different cities, namely Hyderabad, Rawalpindi, Kohat and Peshawar. 24 brick samples were made from these four different clays sources
Summary
A good burnt clay brick should be hard enough, well scalded, sound in texture and sharp in outline and measurement and should not break definitely. Burnt clay bricks used in the construction sphere must have certain desired properties that must be achieved [1]. These include density, porosity, breaking strength, thermal stability and fire resistance. Breaking strength is a mechanical property which has assumed greater prominence for various reasons. A greater breaking strength upsurges other properties like resistance to abrasion and flexure, this property should be determined more accurately [2]. Breaking strength relies on the chemical composition of clay used, the manufacturing techniques followed by the physical shape and dimension of the brick
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