Abdul Aziz, Nurhanim
(2018)
Reduction Of Sulphate In Waste
Recycle Aggregate Using Bacillus Subtilis.
PhD thesis, Universiti Sains Malaysia.
Abstract
Waste concrete aggregate (WCA) is highly potential to be re-utilised as a
recycled material as it is applicable to numerous functions. Attached cement paste on
WCA surface has limited the potential WCA to be recycled as a part of raw
construction materials. Low density, high in water absorption and sulphate content are
identified as the major contributing factors for this limitation. The sulphate content in
delayed ettringite formation (DEF) from high water absorption of attached cement
paste leads to DEF expansion and forms a micro-crack, causing a mass loss and affects
the mechanical strength (compressive strength) of the concrete.
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