ENHANCEMENT OF RECYCLED AGGREGATE CONCRETE PROPERTIES BY A NEW TREATMENT METHOD

Authors

  • Ngoc Kien Bui Graduate School of Environmental Studies, Tohoku University, Japan
  • Tomoaki Satomi Graduate School of Environmental Studies, Tohoku University, Japan
  • Hiroshi Takahashi Graduate School of Environmental Studies, Tohoku University, Japan

Keywords:

Recycled Aggregate Concrete, Sodium Silicate, Pozzolanic Materials, Treatment Method

Abstract

Recently, decreasing natural sources of aggregate accompanied by increasing large quantities
of construction and demolition waste (CDW) cause challenges for environment and construction industry. A
significant solution for this is to recycle CDW as a new aggregate source for concrete. However, using
recycled concrete aggregate (RCA) in concrete involves various obstacles and controversial issues in
controlling the quality of recycled aggregate concrete (RAC). This study is an effort to improve the quality of
RAC containing 100% coarse RCA by using pozzolanic and sodium silicate solution as new treatment
solutions. This study examined performance abilities of RAC after being treated with new treatment solutions
and a new mixing procedure. The mechanical properties of RAC were evaluated based on testing of concrete
under various conditions. The significant results indicated that sodium silicate combined with pozzolanic
materials can improve mechanical properties of RAC containing 100% coarse RCA. At 20% concentration of
sodium silicate and silica fume, the compressive strength of RAC could improve up to 36%. Achievements of
this approach demonstrated its effectiveness in enhancing the strength of RAC, which is potentially applied
to treating RCA for concrete in the future.

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Published

2018-01-28

How to Cite

Ngoc Kien Bui, Tomoaki Satomi, & Hiroshi Takahashi. (2018). ENHANCEMENT OF RECYCLED AGGREGATE CONCRETE PROPERTIES BY A NEW TREATMENT METHOD. GEOMATE Journal, 14(41), 68–76. Retrieved from https://geomatejournal.com/geomate/article/view/624