University of Khartoum

Use of Sudanese Molasses and Vinasses as Concrete Admixtures

Use of Sudanese Molasses and Vinasses as Concrete Admixtures

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Title: Use of Sudanese Molasses and Vinasses as Concrete Admixtures
Author: Mohamed, Sara Tageldin Hassan
Abstract: This study aimed at finding alternative indigenous Sudanese materials for concrete admixtures that are necessary for casting concrete in hot climate of the Sudan. This study focused on investigating the suitability of using Sudanese sugar industry byproducts as concrete admixtures; namely molasses from Kenana Sugar Company (MKSC), molasses from Sudanese Sugar Company (MSSC) and vinasses from Kenana Sugar company (VKSC). The methodology of the study was based on identifying suitable dosages in the range of 0.3% to 5% (by cement weight) of the above mentioned sugar byproducts from literature review. A dosage of 0.3% was identified and adopted for testing the molasses, however, no previous study for using vinasses was found. It was decided to test VKSC using the maximum allowable dosage for an admixture defined as 5% of cement weight. Hence the European standards BS EN 934 & BS EN 480 were used as a framework to classify the functionality of these byproducts when used as concrete admixtures. Several trials concrete mixes containing MKSC&VKSC with different water contents were prepared, tested and their results were compared to reference concrete mix without admixture having w/c ratio of 0.58 and consistence (slump=70±10) mm. The results of this study showed that addition of 0.3%MKSC permitted up to 20% water content reduction, while the 5% of VKSC allowed up to 10% water reduction. These water reduction levels for both admixtures provided similar consistence to the reference concrete mix, and furthermore improved compressive strength of concrete without affecting the air content by more than 2% of reference concrete mix. However, unlike most of sugar byproducts that retard cement hydration, this study showed the opposite for the tested dosage of MKSC&VKSC. This might be attributed to other ingredients of the tested sugar byproducts that accelerated cement setting& hardening. Generally, adding 0.3%MKSC satisfied all criteria set by BS EN 934 for a high range water reducer (HRWR), but failed at satisfying the criteria for initial and final setting time to be classified as SR or setting accelerator (SA). Also 5%VKSC satisfied all criteria set by BS EN 934 for a water reducer (WR), but failed at satisfying the criteria for initial and final setting time to be classified as SR/WR or (SA).So it can be classified as (WR) admixture. Further researches are needed to find optimum dosages that do not impair concrete setting time.
URI: http://khartoumspace.uofk.edu/handle/123456789/17431
Date: 2015-12-03


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