International Concrete Abstracts Portal

Title: USE OF LIMESTONE DUST FOR CONCRETE IN XAYABURI HYDROELECTRIC POWER PROJECT

Author(s): Sirindhorn Chulalongkorn, Apirak Suraphakdee

Publication: TCA

Volume: 4

Issue: 1

Appears on pages(s): 40-51

Keywords: Fine Material, Manufactured Sand, Limestone Dust

DOI:

Date: 1/1/2016

Abstract:
The Xayaburi Hydroelectric Power Project is a huge concrete structure project which needs more than 4 million cubic meter of concrete. At peak period, the concrete consumption went higher than 150,000 cubic meter per month. The project located in remote area and limited with river sand source. In addition, the river sand is too fine. This article aims to present achievement on utilization of manufactured sand with limestone dust for concrete works. The coarse and sharp manufactured sand has mixed with fine and round river sand resulted well gradation fine aggregate. Anyhow, the manufactured sand composes of limestone dust higher than prescribed in ASTM C33 and the project specification. The washing method has been used to reduce limestone dust to meet the Standard. In contrast, the resulted of washing method had shown in adequate production rate, gap gradation, time consume and compose with additional cost. In order to utilize all manufactured sand, without washing, the physical and chemical properties of limestone dust have been researched. The resulted shown that the limestone dust equivalent as sand. Then, the concrete trial mix was undertaken. As a result, the concrete properties were in the range of required compressive strength, well pump ability, well water consumption. As of present, concrete classes 25, 35 and 50 MPa, self-compacted concrete, Roller Compacted Concrete, Precast Concrete, Backfill Concrete, Silica fume concrete produced from the manufactured sand with high fine content have been adopted without any defect in the concrete quality.