An innovative disc shell-making method for preparing porous eco-concrete with cold-bonded lightweight aggregates

Renjie Niu; Junjie Hu; Junyao Liu; Weizhuo Zhang; Guang Liu; Jun Liu; Feng Xing

doi:10.1016/j.envres.2024.120499

An innovative disc shell-making method for preparing porous eco-concrete with cold-bonded lightweight aggregates

Environ Res. 2024 Nov 30:266:120499. doi: 10.1016/j.envres.2024.120499. Online ahead of print.

Authors

Renjie Niu¹, Junjie Hu¹, Junyao Liu¹, Weizhuo Zhang², Guang Liu¹, Jun Liu³, Feng Xing¹

Affiliations

¹ Guangdong Provincial Key Laboratory of Durability for Marine Civil Engineering, College of Civil and Transportation Engineering, Shenzhen University, Shenzhen, 518060, China.
² Guangdong Provincial Key Laboratory of Durability for Marine Civil Engineering, College of Civil and Transportation Engineering, Shenzhen University, Shenzhen, 518060, China; College of Civil Engineering and Transportation, Guangzhou University, Guangzhou, 510006, China. Electronic address: 2060471065@email.szu.edu.cn.
³ Guangdong Provincial Key Laboratory of Durability for Marine Civil Engineering, College of Civil and Transportation Engineering, Shenzhen University, Shenzhen, 518060, China; State Key Laboratory of Intelligent Construction and Healthy Operation and Maintenance of Deep Underground Engineering, College of Civil and Transportation Engineering, Shenzhen University, Shenzhen, 518060, China. Electronic address: liujun@szu.edu.cn.

PMID: 39622352
DOI: 10.1016/j.envres.2024.120499

Abstract

Porous eco-concrete (PEC) can achieve safety protection and ecological protection. This study utilized cold-bonded lightweight aggregates (CBLAs) as coarse aggregates and improved the PEC preparation process via the disc shell-making method. The compressive strength, void ratio, pH value, sand permeability, and plant growth of PECs were studied. The use of CBLAs can reduce the amount of cement used, reduce the total amount of Ca(OH)₂, and improve the living environment of plants. The new technology of using a disc to prepare PECs helps wrap the cement slurry evenly around CBLAs, reducing the problem of bottom slurry sedimentation and slurry blockage in fresh concrete and ensuring space for plant root growth. The germination rate of plants cultivated with CBLAs is more than twice that of plants cultivated with natural aggregates. In summary, this study provides a new avenue for the widespread application of CBLAs and AAPEC.

Keywords: Cold-bonded lightweight aggregates; Municipal solid waste incineration bottom ash; Plant compatibility; Porous eco-concrete; Process optimization.