Investigation of the Quality of Concrete in Khartoum Province

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Alawia Ahmed, Osman
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The concrete making practice in Khartoum has been accorded very little attention despite the markedly rapid increase in the use of concrete and concrete products. The demand has been estimated as 48000 tonnes for the year 1984/85. There is a clear lack of knowledge and negligence to the general principals of making good quality concrete. This has lead to considerable concern from engineers and scientists, and some efforts have been started to obtain relevant and reliable information on concrete materials and practice so as to point out the nature and extent of concreting in Khartoum. This work has been particularly directed to act as a base- line study touching on different technical aspects of concrete making in Khartoum. The first part dealt with statistical analysis of the available data on compressive strength results which have been accumulated for years. The results have shown very high scatter, and high percentage of tests fall below the specific strength. This fact has indicated a low degree of control and has therefore justified further investigation of other concrete aspects studied in the following sections of this work. The second part of the study evolved investigation of the materials used for concreting in Khartoum. . Both field survey and laboratory work have been carried out. The outcome revealed that aggregates are generally of good mechanical properties, but of unsatisfactory grading. The third part of the work has been directed to intensive studies on field and laboratory concreting, so as to evaluate the quality of concrete at site. The outstanding features of concreting in site are: poor site management and poor quality control; this has evidenced by the measured properties of concrete. The fourth part of the work has to do with the evaluation of non-destructive testing: Schmidth hammer was used and the test results indicated that the hammer test can be relied upon with careful interpretation of data. The fifth part of the work has been dedicated to a very especial area of concreting associated with the geography of Khartoum, i. e. concreting in hot weather. A very serious work has been carried out in the laboratory under condition simulating the weather in Khartoum. It has been possible to indicate the extent of effect of the hot-day weather on concrete properties in comparison to concrete under normal conditions. According1y by investigating the main aspects of concreting in Khartoum it has been possible to provide base-line data which helps to indicate the magnitude of concreting problem in Khartoum. This will stress the need for further detailed studies which eventually lead to specifications for concreting in Khartoum
Investigation , Quality , Concrete , Khartoum Province