Abstract
This study aimed to analyse the re-use of dam silt as a supplementary binder for self-compacting concrete (SCC). When burnt, silt becomes more reactive because the kaolin it contains is converted into metakaolin. Portland cement, calcined or burnt silt and ground granulated blast furnace slag were used in this research. Cement pastes were prepared with blends containing two or three of these materials. The replacement ratio for burnt silt in both cases was 10 % and 20 % by cement weight and the ratio for the slag was a constant 30 % by weight of the blend. Rheological and zeta potential tests were conducted to evaluate paste electrokinetics and rheological behaviour. The findings showed that burnt silt is apt for use as an addition to cement for SCC manufacture.
Highlights
A number of models have been put forward to describe the rheological characteristics of self-compacting concrete (SCC), the most common of which in cement systems is the Bingham and Herschel-Bulkley model (1, 2)
This study explored the possibility of using burnt dam silt as an addition to cement in SCC manufacture
The findings revealed that the material exhibits the properties necessary for such use
Summary
A number of models have been put forward to describe the rheological characteristics of self-compacting concrete (SCC), the most common of which in cement systems is the Bingham and Herschel-Bulkley model (1, 2). Laboratory studies designed to predict concrete rheological properties often use a simplified version of the mix under consideration, consisting of the respective cement paste. The reason for testing cement paste instead of concrete is to save materials and labour. The literature shows that the rheological behaviour of concrete can be monitored on the grounds of the behaviour of the respective paste or mortar (3). With the present use of new mineral additions for preparing SCC, tests are often conducted on concrete directly. Material batching and curing time are important, along with other considerations such as the cement-admixture ratio for optimising the rheological properties of the concrete
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