Behavior of polyurea-woven glass fiber mesh composite reinforced RC slabs under contact explosion. (October 2019)

• Record Type: Journal Article
• Authors: Shi, Shaoqing; Liao, Yu; Peng, Xiongqi; Liang, Chaoke; Sun, Jianhu
• Is Part Of: International journal of impact engineering. Volume 132(2019)
• Publication Date: 2019-10
• Subjects: Blast fragments -- RC slab -- Polyurea -- Contact explosion -- Woven glass fiber mesh; Impact -- Periodicals; Shock (Mechanics) -- Periodicals; Impact -- Périodiques; Choc (Mécanique) -- Périodiques; Impact; Shock (Mechanics); Periodicals; 620.1125
• DOI: 10.1016/j.ijimpeng.2019.103335
• Languages: English
• ISSNs: 0734-743X

Abstract

Highlights: Both WGFs and WCFs can enhance the integrity, fracture resistance and local stress concentrations of PU coating, and change the failure mode of PU coating from shear punching failure to tensile failure. Polyurea-woven fiber mesh composite coating can effectively cover the concrete blast fragments compared with that of pure PU coating. WGFs can make the reinforced RC slab appear a trend from local blast-induced perforation to overall plastic yield. The keyword constrained method was applied to deal with the coupling between fiber node and PU node in PU-WGF model. Abstract: Pure polyurea (PU) coating has hidden danger in covering blast fragments and reducing structural local damage when blast-induced perforation occurs in the structure. Thus, enhancement method of adding woven glass fiber mesh (WGF) into pure PU coating to form PU-WGF composite coating was proposed. Field explosion tests on normal RC slab, PU reinforced RC slab and PU-WGF reinforced RC slab were carried out to comparatively study the reinforcing performance between PU coating and PU-WGF coating. Simultaneously, contact explosion tests were also conducted on PU-woven carbon fiber mesh composite (PU-WCF) reinforced RC slab to verify the enhancement of other types of woven fiber mesh on pure PU matrix. Finally, the experimental results were used to calibrate the numerical calculation model of the PU-WGF reinforced RC slab. Failure mode of coating, blast fragment distribution and damage extent of RC slab were investigated. Results show that the WGF can enhance the load transmitting, integrity and fracture resistance of the PU coating, and change the failure mode of PU coating from shear punching failure to tensile failure.