• Cement
• /
• s.149
• /
• pp.44-50
• /
• 1998

• Cement Symposium
• /
• no.26
• /
• pp.78-84
• /
• 1999

• Cement
• /
• s.161
• /
• pp.28-37
• /
• 2003

• Cement Symposium
• /
• no.26
• /
• pp.153-163
• /
• 1999

• Cement Symposium
• /
• no.25
• /
• pp.80-84
• /
• 1997

• Journal of the Korean Recycled Construction Resources Institute
• /
• v.2 no.4
• /
• pp.314-320
• /
• 2014

Although the cement industry serves as the cornerstone of the construction industry by supplying one of its fundamental materials, it confronts new environmental challenges due to the problem of the $CO_2$ generated from raw materials and fuel used in the cement manufacturing process. Also, concrete structures can be decomposed and reused as construction materials. Simply in terms of the cyclic processing of $CO_2$, recycling waste concrete to manufacture recycled aggregate or recycling waste concrete powder, which is the material for cement can be considered optimally environment-friendly practices. This study contributes to the aim of manufacturing high value added materials that exploits the chemical properties of the waste concrete powder. From the research results, waste concrete powder is feasible to use to produce low carbon type recycled cement.

• Cement Symposium
• /
• no.30
• /
• pp.266-273
• /
• 2003

• Cement Symposium
• /
• no.24
• /
• pp.96-101
• /
• 1996

• Cement Symposium
• /
• s.49
• /
• pp.97-104
• /
• 2022

• Journal of the Korean Recycled Construction Resources Institute
• /
• v.7 no.4
• /
• pp.88-94
• /
• 2012

This study is conducted to utilize waste concrete powder made as a by-product manufacturing high quality recycled aggregate. The blaine fineness of the used waste concrete powder was 928 and $1,360cm^2/g$. 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. The viscosity of the paste that mixed waste concrete power decreased by 62% at the most, compared to the paste that only used OPC, and the final set time was delayed about two hours. As composition rates of waste concrete powder increased, the flow value decreased by 30% at the most according to the comparison with mortar that only used OPC, and sorptivity coefficients increased by 70%. The compressive strength of mortar decreased by 73% at the most as composition rates of waste concrete powder increased. According to the test results, it is desirable to use waste concrete powder by combining OPC appropriately(below 15%).