Repair & Renovation Guide 87 The seismic forces acting on the bearing structure of a building may cause small-scale detachments in concrete elements such as columns, beams, slabs, walls, etc. Indeed, in some cases, the detachment may have moved deeper, so part of the steel reinforcement of the reinforced concrete has been revealed. After the damage is inspected and examined by an engineer who will give the necessary directions for its restoration, proceed to the next stage of repair. If the detachment is deeper and that part of the steel reinforcement has been revealed, then the first step, after removing the disintegrated parts, is to clean thoroughly and protect the steel reinforcement/rebar(s). The procedure is as follows: By using a wire brush, a grinder, or RUST REMOVER of DUROSTICK (p. 267), thoroughly remove rust that may have formed on the reinforcing bars. On surfaces highly affected by carbonation, remove the rust by mechanical means. Continue by applying on the entire surface of the steel reinforcement and the surrounding surface as well, the corrosion inhibitor RUST FREE POWDER (p. 267) by using a brush. Before the inhibitor dries, repair and even/level the concrete surface with the appropriate reinforced cementitious repair mortar for concrete of DUROSTICK: D-55 (p. 237), DUROFIX (p. 248), DS-244 POWER MORTAR RESIN (p. 243), DS-245 POWER MORTAR RAPID (p. 244), DS-240 (p. 243) or DS-247 (p. 244). Repair on limited size surfaces of reinforced concrete after detachment and rebar exposure. Also, protection of the steel reinforcement/rebar.
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