The Effect of Demolition Concrete Waste on the Physical, Mechanical, and Durability Characteristics of Concrete
Jian Tang,
Jingying Cao,
Hua Luo,
Weihua Chen,
Zhiyou Jia,
Sandra Cunha,
José Aguiar
Affiliations
Jian Tang
Disaster Prevention and Mitigation Engineering Technology Research Base of Think Tank of Jiangxi Association for Science and Technology, School of Civil Engineering, Jiangxi Science and Technology Normal University, Nanchang 330013, China
Jingying Cao
Disaster Prevention and Mitigation Engineering Technology Research Base of Think Tank of Jiangxi Association for Science and Technology, School of Civil Engineering, Jiangxi Science and Technology Normal University, Nanchang 330013, China
Hua Luo
GCM—Joint Laboratory of Green Construction Materials, Department of Civil Engineering, Nanchang Institute of Technology, Hero Main Campus, Nanchang 330013, China
Weihua Chen
Disaster Prevention and Mitigation Engineering Technology Research Base of Think Tank of Jiangxi Association for Science and Technology, School of Civil Engineering, Jiangxi Science and Technology Normal University, Nanchang 330013, China
Zhiyou Jia
C-TAC—Centre for Territory, Environment and Construction, University of Minho, Campus of Azurem, 4800-058 Guimarães, Portugal
Sandra Cunha
C-TAC—Centre for Territory, Environment and Construction, University of Minho, Campus of Azurem, 4800-058 Guimarães, Portugal
José Aguiar
C-TAC—Centre for Territory, Environment and Construction, University of Minho, Campus of Azurem, 4800-058 Guimarães, Portugal
With the development of urbanization, more and more construction and demolition waste (CDW) is generated. To enhance the mechanical properties and durability of concrete through the incorporation of recycled aggregate, the water/cement ratio was controlled to optimize the properties of concrete. In this work, one reference concrete with a water/cement ratio of 0.5 was prepared. The demolition concrete waste from East China was used, and 50% and 100% of the natural aggregates of the reference concrete were substituted. Furthermore, the water/cement ratio of concrete with 50% and 100% CDW was reduced to 0.3, and the superplasticizer was used to justify the workability of fresh concrete. Finally, the workability of fresh concrete was determined. After curing for 28 days, the density, water absorption, and resistance to chloride penetration of concrete were realized. The compressive and flexural strength were examined at 14 and 28 days, and the electrical resistivity test was conducted at 7, 14, and 28 days. The results indicate that with increasing CDW content, the mechanical properties and durability of concrete decreased. However, when the water/cement ratio decreased to 0.3, the concrete properties were optimized, such as the compressive strength and resistance to chloride penetration of concrete with 50% CDW increased by 74.2% and 28%, respectively.
