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http://dx.doi.org/10.14190/JRCR.2015.3.3.277

Utilizability of Waste Concrete Powder as a Material for Soil Pavement  

Kim, Yong-Jic (Daewoo E&C, Civil Engineering Research Team)
Choi, Yun-Wang (Semyung University, Department of Civil Engineering)
Kim, Young-Jin (Daewoo E&C, Institute of Construction Technology)
Publication Information
Journal of the Korean Recycled Construction Resources Institute / v.3, no.3, 2015 , pp. 277-282 More about this Journal
Abstract
This study is conducted to utilize waste concrete powder (WCP) made as a by-product manufacturing high quality recycled aggregate. The blaine fineness of the used waste concrete powder was $928cm^2/g$. As the main characteristic of waste concrete powder, it showed an angular type similar to cement, but hydrated products were attached on the surface of particles. In addition, the size of the particles of waste concrete powder was larger than OPC and in terms of chemical components it had higher $SiO_2$ contents. For using WCP in soil cement-based pavement, the qualities, physical and chemical properties, of WCP should be researched. In the first step, the specified compressive strength of mortar for two types of clay sand soil and clay soil respectively was experimented to be 15 MPa and then optimum mixing ratio of chemical solidification agent were decided in the range of 1.5 - 3.0% in the replacement with cement weight content. In the second step, based on the prior experimental results, recycling possibility of WCP in soil cement-based pavement was studied. In the result of experiment the mixing ratio of WCP were 5, 10, 15 and 20% in the replacement with soil weight and the compressive strength of mortar was somewhat decreased according to the increase of the mixing ratio of WCP.
Keywords
Waste concrete powder; Recycled aggregate; Blaine fineness; Pavement;
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