The research significance of the steel reinforced recycled aggregate concrete’s fire resistance

2015 ◽  
pp. 841-843
Author(s):  
Bing Wang ◽  
Xiao Liu ◽  
Lu Gao
Keyword(s):  
Fire Resistance ◽  
Recycled Aggregate

Fire resistance of recycled aggregate alkali-activated concrete

2022 ◽  
pp. 489-506
Author(s):  
Prinya Chindaprasirt ◽  
Piti Sukontasukkul ◽  
Vanchai Sata ◽  
Trinh Cao
Keyword(s):  
Fire Resistance ◽  
Recycled Aggregate ◽  
Alkali Activated Concrete ◽  
Alkali Activated

Study on Fire Resistant Performance of Recycled Concrete Tubular Structures

2012 ◽  
Vol 256-259 ◽  
pp. 2781-2785
Author(s):  
Hong Ying Dong ◽  
Wan Lin Cao ◽  
Jian Wei Zhang
Keyword(s):  
High Temperature ◽  
Fire Resistance ◽  
Tubular Structure ◽  
Recycled Concrete ◽  
Recycled Aggregate ◽  
Fine Aggregate ◽  
Replacement Rate ◽  
Normal Concrete ◽  
Aggregate Concrete ◽  
Fire Endurance

In order to achieve the fire resistance performance of recycled concrete, four concrete tubular structure specimens were designed and tested under the high temperature. One of the specimens was made from normal concrete C20, one was made from recycled coarse aggregate concrete C20, and two were made from recycled coarse and fine aggregate concrete C20 and C40 respectively. The temperature field, the vertical displacement, the wall deflection and the fire endurance were comparatively analyzed. Results show that the rate of temperature increasing inside the concrete becomes smaller with the increase of recycled aggregate replacement rate. The temperature of specimens with recycled concrete is lower than that with normal concrete at the same position, the same force condition and the same fire condition. The load carrying capacity of specimens with recycled concrete is lower than that of the normal concrete specimen due to the bigger porosity of recycled concrete. The fire endurance decreases with the increase of recycled aggregate replacement rate in the specimens. With the increase of the strength of recycled concrete, fire resistance and fire endurance of the tubular structure decrease and the structure tends to fail in expansion under high temperature.

scholarly journals Viability of the use of construction and demolition waste aggregates in alkali-activated mortars

2018 ◽  
Vol 68 (331) ◽  
pp. 164 ◽  
Author(s):  
M. M. Alonso ◽  
A. Rodríguez ◽  
F. Puertas
Keyword(s):  
Fire Resistance ◽  
Mechanical Performance ◽  
Total Porosity ◽  
Recycled Concrete ◽  
Construction And Demolition Waste ◽  
Recycled Aggregate ◽  
Recycled Aggregates ◽  
Partial Replacement ◽  
Demolition Waste ◽  
Alkali Activated

This study explores the technological feasibility of using construction and demolition waste (C&DW) as recycled aggregate in alkali activated mortars, ascertaining the mechanical and microstructural behavior. Shrinkage behavior of alkali activated slag mortars (AAS) and fire resistance of alkali activated fly ash (AAFA) incorporating recycled aggregates have been also tested Normalized siliceous sand and two types of recycled concrete aggregates were used in the mixes at different proportions. The findings showed that water demand was higher in mortars prepared with recycled aggregate. Partial replacement (20% - 80/20) of conventional aggregate with the recycled material was also observed to yield mortars with high mechanical strength, although total porosity also rose. Total replaclement, gave worse mechanical performance however. Fire resistance and shrinkage studies conducted indicated that alkaline cement mortars prepared with 80/20 recycled aggregated exhibit acceptable performance.

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