Browsing by Author "Abeysinghe, ALNU"

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    item: Thesis-Abstract
    Property change of road aggregate with blasting effects
    (2015-09-17) Abeysinghe, ALNU; Mampearachchi, WK
    Road aggregate is the largest component contributing to road construction. In Sri Lanka, naturally occurring sources that suits construction work are not available. Therefore, this requirement is most commonly fulfilled by excavating rocks and crushing them to suitable sizes. Demand for road aggregate has increased due to the current development of highway sector in Sri Lanka, and it is difficult to satisfy the requirement. In some areas of the country, especially in the Northern region, it is hard to fulfill these requirements due to several reasons such as archeological sites and environmental-sensitive forest areas. Therefore, quality control and fulfillment of the requirement with the available limited sources is a challenge. Considering the use of crushed rock for road construction, it is important to select materials in an acceptable quality. Especially when crushed rock is used for the road bases and surfacing, these properties play a vital role in ensuring durability. To ensure the quality, various tests have been introduced by relevant authorities. When selecting a source to produce crushed rock as road construction material, production from the selected source have to satisfy certain requirements. The los angeles abration value (LAAV) and aggregate impact value (AIV) is the two important tests which ensure the strength requirement of road aggregate. With the blasting operation, a considerable variation of rock fragmentation is noted. This is mainly due to the explosive quantity used for blasting operation. Types and features of explosives and blasting design also play an important role of rock mass fragmentation. In Sri Lanka, blasting design patterns and the explosives used do not vary considerably. But usage of explosives changes in continuous operation even the place is unchanged. These changes may be due to environmental conditions such as rainy seasons or due to some significant change of nature and properties of rock mass. The objective of this study was to identify the changes of AIV and LAAV with the use of explosive percentage used for the blasting operation and improve the strength of road aggregate by controlling the explosive usage for aggregate production. There was not found a relationship between explosive usage for blasting and the aggregate strength properties. But the significant relationship was found between the LAAV and AIV of the aggregate.
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    item: Conference-Abstract
    Property change of road metal with blasting effects
    (Department of Civil Engineering, University of Moratuwa., 2012-07) Abeysinghe, ALNU; Mampearachchi, WK; Pasindu, HR
    Road metal is the largest component which contributes for road construction. Normally, in Sri Lanka naturally occurred sources are not available to suite the construction work. So, most commonly this requirement is fulfilled by excavating of rocks and crushing to the suitable sizes. With the current development of the highway sector in Sri lanka, the demand for the road metal is gone up and it is very difficult to full fill the requirement. In some areas in the country especially in the Northern area it is hard to full fill these requirements due to several reasons like archeological areas, environmental sensitive forest areas etc. So, the quality control and fulfillment of the requirement with the available limited sources is very important. When consider the use of crushed rock for the road construction, it is important to select materials in an acceptable quality. To ensure the quality, various tests have been introduced by relevant authorities. Especially when crushed rock use for the road bases and surfacing these properties are very much important to ensure the durability. When selecting a source to produce crushed rock as road construction material, production from the selected source have to be satisfied certain requirements. The LOS ANGELES ABRASION VALUE (LAAV) and AGGREGATE IMPACT VALUE (AIV) are the two important tests to be carried out to ensure the strength requirement of the road metal. It has been noted that with the blasting operation, there is a considerable variation of rock fragmentation and it is mainly due to the quantity of explosive that use for the blasting operation. Types and features of explosives and blasting design also play an important role of rock mass fragmentation. In Sri Lanka, blasting design patterns and explosives that are using is not varying considerably. But usage of explosives changes in continuous operation even the place is unchanged. Sometimes these changes are due to environmental condition such as rainy seasons and due to some significant change of nature and properties of rock mass. The objective of this study is identify the changes of AIV and LAAV with the use of explosive percentage use for the blasting operation and improve the strength of road metal by controlling the explosive usage for the metal production. Ensure the quality control of material production with less variation of strength, due to blasting operation.