Lesson 1Quality control and testing of repairs (coring, pull-off tests, visual acceptance criteria, monitoring)This section covers quality checks for underwater repairs, including checks before placement, coring, pull-off tests, visual standards, and ongoing monitoring, with steps for recording results and fixes.
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)This section looks at how sea conditions wear down concrete, including chloride entry, carbonation, freeze-thaw cycles, abrasion, and chemical damage, connecting these to common underwater issues and repair choices.
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)This section details tools and gear worn by divers for underwater concrete tasks, like mixers, grout pumps, tremie hoses, vibrators, and support items, stressing safe use, upkeep, and deployment from boats.
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)This section shows ways to check submerged concrete and bare reinforcement, using visual checks, sounding, chain drag, and ultrasonic tests, with tips on mapping defects, noting them, and talking to tenders.
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 mortarsThis section goes over underwater repair materials like hydraulic mortars, cement grouts, anti-washout mixes, and epoxy mortars, covering choices, handling, storage, and 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)This section describes formwork and cofferdam setups for underwater fixes, including removable forms, pre-made collars, and inflatable dams, focusing on picking, installing, sealing, bracing, and safe draining.
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)This section handles mixing ratios, blending, and placing underwater concrete and mortars, focusing on anti-washout additives, tremie and pump methods, consolidation, and curing for strength and lasting quality underwater.
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)This section explains how divers prep submerged concrete for bonding, covering cleaning, hydro-scarifying, scabbling, needle-gunning, water jetting, and hand tools, with focus on surface 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
