Journal Published Online: 13 August 2019
Volume 49, Issue 3

Experimental Study on Road Base Material of Geopolymer Recycled Concrete

CODEN: JTEVAB

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.

Author Information

Zhu, Zhiduo
Institute of Geotechnical Engineering, Southeast University, Nanjing, Jiangsu Province, People’s Republic of China
Gu, Suen
Institute of Geotechnical Engineering, Southeast University, Nanjing, Jiangsu Province, People’s Republic of China
Tang, Zhen
Institute of Geotechnical Engineering, Southeast University, Nanjing, Jiangsu Province, People’s Republic of China
Song, Lei
Institute of Geotechnical Engineering, Southeast University, Nanjing, Jiangsu Province, People’s Republic of China
Pages: 16
Price: $25.00
Related
Reprints and Permissions
Reprints and copyright permissions can be requested through the
Copyright Clearance Center
Details
Stock #: JTE20180100
ISSN: 0090-3973
DOI: 10.1520/JTE20180100