https://orcid.org/0000-0002-8129-8974
Abstract
In order to treat and recycle massive waste concrete, ground waste concrete powder (GWCP) and fly ash (FA) were utilized to produce a geopolymer, a kind of cementitious material. The geopolymer and recycled concrete aggregates (RCAs) were then used to produce geopolymer recycled concrete (GRC), which can be used as a road base material. The feasibility of GRC as a road base material was analyzed by a series of tests, including the mixture ratio test of the geopolymer, road performance test of RCAs, and the tests for mechanical properties of GRC. The test results show that for the geopolymer, the optimum mixture ratio of GWCP to FA was 30/70 (weight/weight), with the concentration of sodium hydroxide (NaOH) solution being 18 mol/L, and the modulus of water glass being 1.5. Except for the slightly large water absorption content, the sludge content, flat and elongated particle content, and the crushing value of RCAs meet the technical requirements for aggregates of road base. The unconfined compressive strength, splitting strength, uniaxial compression modulus, water stability, and dry shrinkage of GRC meet the requirements of the related codes, indicating that it can be used in road base. GRC is not only capable of solving the problems of waste concrete treatment but can also reduce the exploitation of natural stone, the use of cement, and the emission of air pollutants, bringing obvious environmental, economic, and social benefits.
Issue Section:
Technical Papers
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