School of Civil and Architectural Engineering, Zhejiang University, Hangzhou 310058, China; College of Civil Engineering, Hunan University, Changsha 410082, China; Department of Civil, Architectural, and Environmental Engineering, Missouri University of Science and Technology, Rolla 654009, USA; State Key Laboratory Base of Eco-Hydraulic Engineering in Arid Area, Xi'an University of Technology, Xi'an 710048, China; Rock Mechanics and Explosives, Missouri University of Science and Technology, Rolla 654009, USA; Center for Infrastructure Engineering Studies, Missouri University of Science and Technology, Rolla 654009, USA
Abstract In this study, two full-size concrete walls were tested and analyzed to demonstrate the effectiveness of a chemically reactive enamel (CRE) coating in improving their mechanical behavior under blast loading: one with CRE-coated rebar and the other with uncoated rebar. Each wall was subjected in sequence to four explosive loads with equivalent 2, 4, 6-trinitrotoluene (TNT) charge weights of 1.82, 4.54, 13.6, and 20.4 kg. A finite element model of each wall under a close-in blast load was developed and validated with pressure and strain measurements, and used to predict rebar stresses and concrete surface strain distributions of the wall. The test results and visual inspections consistently indicated that, compared with the barrier wall with uncoated reinforcement, the wall with CRE-coated rebar has fewer concrete cracks on the front and back faces, more effective stress transfers from concrete to steel rebar, and stronger connections with its concrete base. The concrete surface strain distributions predicted by the model under various loading conditions are in good agreement with the crack patterns observed during the tests.
