Lesson 1Quality control and testing of repairs (coring, pull-off tests, visual acceptance criteria, monitoring)This bit covers checking quality for underwater fixes, with checks before placing, coring, pull-off tests, what looks good to the eye, and watching over time, plus ways to write down results and fix problems.
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 part looks at how sea water wears down concrete, like salt getting in, carbonation, freezing and thawing, rubbing away, and chemical harm, and how that leads to common underwater problems and choices for fixes.
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 lists tools and gear divers wear for underwater concrete jobs, like mixers, grout pumps, tremie hoses, vibrators, and helper gear, stressing safe use, upkeep, and quick setup from the boat.
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 part shows ways to check drowned concrete and bare steel bars, using sight checks, tapping sounds, chain drags, and sound wave tests, with tips on mapping faults, noting them down, and talking to topside helpers.
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 fix materials for underwater like hydraulic mortars, cement grouts, no-wash mixes, and epoxy mortars, explaining how to pick them, handle, store, and what works 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 part describes moulds and dry areas for underwater fixes, like take-off forms, ready collars, and blow-up dams, key on picking, setting up, sealing, bracing, and safe water removal.
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 amounts, blending, and placing underwater concrete and fix mortars, key on no-wash additives, tremie and pump methods, packing tight, and curing to keep strength and lasting power 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)This part explains how divers ready drowned concrete faces for sticking, covering cleaning, water scarifying, scabbling, needle guns, water jet blasting, and hand tools, stressing roughness, clean state, and safety checks.
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
