Comparative analysis of corrosion resistance and purification performance of geopolymer recycled pervious concrete under acid rain soaking and spraying simulation
IF 7.4 1区 工程技术Q1 CONSTRUCTION & BUILDING TECHNOLOGY
Minqi Hua , Bo Chen , Hui Liu , Pinghua Zhu , Xinjie Wang , Chunhong Chen
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引用次数: 0
Abstract
Acid rain corrosion is a critical factor contributing to the increased susceptibility of concrete pavements to cracking and reduced service life, raising significant safety concerns. This research aims to investigate the acid rain corrosion resistance and purification performance of geopolymer recycled pervious concrete (GRPC) with top-bottom interconnected channels under acid rain soaking and spraying simulation tests. The impacts of acid rain exposure on the compressive strength, permeability coefficient, mass loss, neutralization depth of GRPC, and the pH value of percolating acid rainwater were analyzed. The results proved that GRPC exhibited excellent resistance to simulated acid rain with a pH of 4.0. Furthermore, employing a combination of sodium hydroxide and sodium silicate as alkali-activators provided the optimal acid rain corrosion resistance. Additionally, in the early stage of acid rain exposure, acid rain was neutralized by the sodium carbonate formed through efflorescence. While in the middle-later stage, the migrating alkaline substances in GRPC matrix directly neutralized the pH of acid rain. Notably, after 28 days of simulated acid rain spraying, GRPC maintained its ability to purify the acid rain flowing through its channels, successfully raising the pH from 4 to a range between 7 and 8, demonstrating an effective acid rain purification capability. In conclusion, GRPC can transform the efflorescence issue in concrete into an effective means to counteract acid rain corrosion, thereby equipping concrete pavements with the dual advantages of alleviating urban waterlogging and resisting acid rain corrosion. This renders GRPC a promising avenue for both academic research and practical engineering applications.
期刊介绍:
Construction and Building Materials offers an international platform for sharing innovative and original research and development in the realm of construction and building materials, along with their practical applications in new projects and repair practices. The journal publishes a diverse array of pioneering research and application papers, detailing laboratory investigations and, to a limited extent, numerical analyses or reports on full-scale projects. Multi-part papers are discouraged.
Additionally, Construction and Building Materials features comprehensive case studies and insightful review articles that contribute to new insights in the field. Our focus is on papers related to construction materials, excluding those on structural engineering, geotechnics, and unbound highway layers. Covered materials and technologies encompass cement, concrete reinforcement, bricks and mortars, additives, corrosion technology, ceramics, timber, steel, polymers, glass fibers, recycled materials, bamboo, rammed earth, non-conventional building materials, bituminous materials, and applications in railway materials.