Rynneld Bin Rinu
Metric No: BK10110260
Topic: Identification of Alkali Silica Reactivity of Aggregate from Different Quarries in KK
Abstract: In this research, a potentially highly reactive aggregate, and a potentially moderately reactive aggregate (sandstone) from two different quarries were used in the determination of ASR expansion of concrete. Two different aggregates (sandstone) samples from two locations of quarries in Kota Kinabalu area collected and used as aggregates in the mixture of the mortar bars to be tested and the results compared. The ASR expansion identified by two standard tests for determines ASR expansion, Accelerated Mortar Bar Test (AMBT) and Autoclave test. The standard that been use for identified the reactivity degree through the expansion in AMBT is ASTM C1260-05, and the reactivity degree in autoclave test is from the assumption through the expansion of the mortar bars.
Aggregates that are susceptible to ASR can be used in hydraulic cement concrete provided measures are taken to avoid the potential deleterious aspects of ASR. The primary measures are the use of pozzolans or slag, and limiting the alkali content of the concrete. Recent studies have suggested that lithium-based admixtures may also be used to avoid ASR-related expansions. Several tests are available to assess the effectiveness of the various mitigation strategies, but the results they provide need to be evaluated within the context of the testing scheme and its relationship to the materials and field conditions under consideration.