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203 results on '"Ma, Baosong"'

46. Grouting Methods in Manhole Rehabilitations at Coastal Areas: Case Study

Author

Cong Zeng, Wenfang Wu, Yahong Zhao, Zhu Zihao, Ma Baosong, and Tie Wang

Subjects
Infiltration (hydrology), Mechanical Engineering, Environmental science, Geotechnical engineering, Inflow, Civil and Structural Engineering
Abstract

For underground structures at coastal areas, inflow/infiltration (I/I) control is a critical procedure to guarantee their quality, especially for manholes, which are more likely to have str...

Published
2021

47. Durability Study on High-Performance Fiber-Reinforced Mortar under Simulated Wastewater Pipeline Environment

Author

Cong Zeng, Ma Baosong, Tianyu Wang, and Yahong Zhao

Subjects
Technology, Materials science, Silica fume, 0211 other engineering and technologies, 02 engineering and technology, Article, Corrosion, 021105 building & construction, General Materials Science, Composite material, wastewater pipeline environments, Cement, Microscopy, QC120-168.85, corrosion, QH201-278.5, 021001 nanoscience & nanotechnology, Engineering (General). Civil engineering (General), Durability, TK1-9971, Compressive strength, Wastewater, Descriptive and experimental mechanics, high-performance concrete/mortar, durability, Cementitious, Electrical engineering. Electronics. Nuclear engineering, Mortar, TA1-2040, 0210 nano-technology
Abstract

The acid–alkaline-inducd corrosive environments inside wastewater concrete pipelines cause concrete structural deterioration and substantial economic losses all over the world. High-performance concrete/mortar (HPC) was designed to have better resistance to corrosive environments, with enhanced service life. However, the durability of HPC in wastewater pipeline environments has rarely been studied. A high-performance mortar mixture (M) reinforced by supplemental materials (including fly ash and silica fume) and polyvinyl alcohol (PVA) fibers, together with a mortar mixture (P) consisting of cement, sand and water with similar mechanical performance, were both designed and exposed to simulated wastewater pipeline environments. The visual appearance, dimensional variation, mass loss, mechanical properties, permeable pore volume, and microstructure of the specimens were measured during the corrosion cycles. More severe deterioration was observed when the alkaline environment was introduced into the corrosion cycles. Test results showed that the M specimens had less permeable pore volume, better dimensional stability, and denser microstructure than the P specimens under acid–alkaline-induced corrosive environments. The mass-loss rates of the M specimens were 66.1–77.2% of the P specimens after 12 corrosion cycles. The compressive strength of the M specimens was 25.5–37.3% higher than the P specimens after 12 cycles under corrosive environments. Hence, the high-performance mortar examined in this study was considered superior to traditional cementitious materials for wastewater pipeline construction and rehabilitation.

Published
2021

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