Lesson 1Quality control and testing of repairs (coring, pull-off tests, visual acceptance criteria, monitoring)Dis part dey talk about quality control for underwater repairs, including checks before placing, coring, pull-off tests, visual acceptance criteria, and long-term monitoring, plus how to write down results and fix any wahala.
Preplacement inspections and checklistsSampling, coring and compressive testingPull‑off and bond tests on repaired areasVisual acceptance criteria for divers and QA staffPost‑repair monitoring and performance trackingLesson 2Mechanisms of concrete deterioration in marine environments (chloride attack, carbonation, freeze-thaw, abrasion)Dis part dey look how sea water dey spoil concrete, covering chloride entering, carbonation, freeze-thaw, abrasion, and chemical attack, and how dese tings lead to common underwater problems and choices for repair.
Chloride penetration and reinforcement corrosionCarbonation effects in tidal and splash zonesFreeze‑thaw and scaling in cold marine watersAbrasion and impact from ice, debris and vesselsChemical and biological attack on concreteLesson 3Tools and diver equipment specific to concrete work (underwater mixers, grout pumps, tremie hoses, underwater vibrators)Dis part dey explain tools and gear wey divers dey wear for underwater concrete work, like mixers, grout pumps, tremie hoses, vibrators, and support gear, stressing safe handling, maintenance, and quick setup from surface.
Underwater and deck‑mounted concrete mixersGrout pumps, hoses and pressure controlTremie hose handling and diver coordinationUnderwater vibrators and consolidation toolsPPE and support gear for concrete operationsLesson 4Assessment techniques for submerged concrete and exposed reinforcement (visual, sounding, chain drag, ultrasonic testing)Dis part dey show methods to check submerged concrete and exposed reinforcement, including visual check, sounding, chain drag, and ultrasonic testing, with advice on mapping defects, writing reports, and talking with tender.
Planning underwater inspection scopes and accessVisual inspection patterns and defect recordingSounding and chain drag for delamination detectionUltrasonic and pulse‑echo testing underwaterCondition rating and repair priority decisionsLesson 5Underwater repair materials: hydraulic repair mortars, cementitious grouts, anti-washout formulations, epoxy mortarsDis part dey review underwater repair materials like hydraulic mortars, cementitious grouts, anti-washout mixes, and epoxy mortars, explaining how to pick dem, handle, store, and consider performance for sea structures.
Hydraulic repair mortars for hand and form repairsCementitious grouts for voids and baseplatesAnti‑washout concrete and grout formulationsEpoxy mortars and bonding agents underwaterMaterial storage, mixing and pot life controlLesson 6Formwork and cofferdam options for underwater repair (removable formwork, prefabricated collars, inflatable dams)Dis part dey describe formwork and cofferdam for underwater repair, like removable forms, prefabricated collars, and inflatable dams, focusing on picking, installing, sealing, bracing, and safe dewatering.
Criteria for selecting formwork or cofferdamsDesign of removable underwater formwork systemsPrefabricated collars for piles and columnsInflatable dams and temporary water exclusionSealing, bracing and controlled dewateringLesson 7Mixing, placement and curing of underwater cementitious materials (anti-washout admixtures, tremie and pumping techniques)Dis part dey cover mixing proportions, placing underwater concrete and repair mortars, focusing on anti-washout admixtures, tremie and pump methods, consolidation, and curing to keep strength and durability under water.
Proportioning underwater concrete and repair mortarsSelection and dosage of anti‑washout admixturesTremie pipe setup, positioning and operationUnderwater concrete pumping procedures and limitsCuring methods and protection in submerged conditionsLesson 8Surface preparation methods underwater (hydro-scarifying, scabbling, needle-gunning, abrasive water jetting, hand tools)Dis part dey explain how divers prepare submerged concrete surfaces for bonding, covering cleaning, hydro-scarifying, scabbling, needle-gunning, abrasive water jetting, and hand tools, with focus on profile, cleanliness, and safety.
Marine growth and contamination removal stepsHydro‑scarifying equipment and operating limitsScabbling and needle‑gunning techniques underwaterAbrasive water jetting setup and safety zonesHand tools for detailing edges and tight areas
