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Water Absorbtion Controlling Type Surface Treatment Method for Quality Enhancement of Recycled Aggregate

순환골재 품질개선을 위한 수분흡수제어형 표면처리방법

  • Choi, Heebok (Department of Architectural Engineering, Jeju National University)
  • Received : 2015.06.01
  • Accepted : 2015.07.14
  • Published : 2015.12.20

Abstract

The research, in order to enhance the quality of recycled aggregate, was carried out the quality characteristics test of the recycled aggregates by applying the four kinds of surface treatment using a colloidal suspension of approximately 5nm~60nm particle size with the alkalinity of pH 10.2. The quality tests of recycled aggregate have been processed by specific gravity, water absorption, porosity, surface properties, and the compression and tensile tests. The colloidal suspension was coated effectively the surface of the old cement mortars of recycled aggregate with a constant thickness by colloidal suspension is being applied to the recycled aggregate surface under constant pressure of 100kpa and then it was dried in at $60^{\circ}C$. The surface treatment method by the Method C out of 4 kinds of surface treatment improved effectively the quality of the recycled aggregates, whereby it obtained the best compressive strength and tensile strength of the recycled aggregate concrete.

본 연구는 순환골재의 품질을 개선시키기 위해 pH 10.2의 알칼리성을 띄고 있는 입경 5nm~60nm 정도의 40% 콜로이달 실리카 수용액을 사용하고, 4가지 표면처리방법을 적용하여 순환골재의 품질 향상 시험을 하였다. 순환골재의 품질시험은 비중, 흡수율, 기공률, 계면특성, 그리고 압축 및 인장시험을 하였다. 100kpa의 일정 압력하에서 콜로이달 실리카 수용액이 표면에 도포되고 $60^{\circ}C$에서 건조됨으로써 콜로이달 실리카 용액이 순환골재의 시멘트 모르타르의 표면을 일정한 두께로 효과적으로 코팅되었다. 4가지 표면처리 방법 중 Method C에 의한 표면처리방법이 순환골재의 품질을 효과적으로 개선시켰으며, 그로인해 순환골재콘크리트의 압축강도 및 인장강도 향상에 영향을 미친 것으로 판단된다.

Keywords

References

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Cited by

  1. Optimum Carbonation Reforming Period of Recycled Aggregate Based on the Microscopic Carbonation Conduct vol.28, pp.3, 2016, https://doi.org/10.4334/JKCI.2016.28.3.329
  2. Performance Evaluation of Recycled Aggregate Concrete Made of Recycled Aggregate Modified by Carbonation vol.28, pp.4, 2016, https://doi.org/10.4334/JKCI.2016.28.4.445