Abstract
This paper presents the fresh properties of Self-Compacting Concrete (SCC) containing metakaolin (MK) produced by calcination of the natural material soorh of district Thatta Sind in Pakistan. Five mixes were tested, including four MK mixes replacing 5-20% of cement, with 0.38 water/binder (W/B) ratio. The fresh properties of the SCCs were evaluated using slump flow, T50, V-funnel, J ring, L-box and sieve segregation tests. Compressive strength of the control and the MK SCC was also investigated. The fresh concrete test results revealed that SCC could be developed by substituting cement with local MK, using 2% superplasticizers and without using a viscosity-modifying amplifier. The SCC with 15% replacement of cement with local MK showed maximum compressive strength, which was 10.39% higher than the control specimen’s without MK.
Highlights
Self-compacting concrete (SCC) is a highly flowable concrete, which can be installed and compacted without any vibration in complex or dense reinforced formworks
This study proposes a method that increases the properties of SCC and reduces the cement production, reducing both CO2 emissions and construction cost, by replacing cement with local MK
By using 2% superplasticizers the slump flow of control and MK SCC was within the recommended range
Summary
Self-compacting concrete (SCC) is a highly flowable concrete, which can be installed and compacted without any vibration in complex or dense reinforced formworks. Some disadvantages in the properties of concrete have been reported as the cement content exceeded a specified value [3] To minimize these negative effects, the requirement to increase powder content in SCC is usually met by using additions. For this purpose, various studies have been conducted on the usage of different additions for partially replacing cement in SCC or self-compacted mortar such as marble powder [4, 5], limestone powder [6], basalt powder [5, 6], fly ash [7,8,9], slag [10, 11], MK [12,13,14,15,16], and other materials[17,18,19,20,21,22]. This study proposes a method that increases the properties of SCC and reduces the cement production, reducing both CO2 emissions and construction cost, by replacing cement with local MK
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