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quote",{},17,"2026-06-11T14:39:08.060Z",{"data":386,"total":18,"filters":508},[387,442,475],{"id":388,"name":389,"slug":390,"shortDescription":391,"description":392,"brand":111,"status":393,"isFeatured":57,"category":394,"primaryImage":399,"media":400,"specs":408,"variants":419,"defaultVariant":436},"cmq9mrcf10023v4jlb0vtrx72","Australian GB Cement 20Kg","australian-gb-cement-20kg","Australian GB Cement 20Kg is a pre-blended Portland cement concrete mix batched for consistent 20 MPa+ compressive strength, suitable for footings, small pours, and general concrete works without a transit mixer. 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Technical Specifications Mix type: Standard Portland cement blend (GP) Bag weight: 20 kg Yield: Approx. 9.5 L per 20 kg bag at standard consistency Compressive strength: ≥ 20 MPa at 28 days Initial set time: 30–90 minutes Water requirement: Approx. 3.0–3.5 L per 20 kg bag Compliance: AS 3972 (Portland cement), AS 3600 (concrete structures) Best Applications Footings and pier pads Steps, paths, and non-structural slabs Pergola and clothesline post anchoring Patch repairs to existing concrete Garden edging and ornamental concrete Delivery & Stock Concrete bags stocked at BuildBarn, 3 Eastlink Drive, Hallam VIC 3803. 24–48 h Melbourne Metro delivery available for pallet quantities. 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Zero maintenance — no oiling, staining, or re-sanding required over its 25-year design life. At BuildBarn Hallam — 24–48 h Melbourne Metro delivery.","Overview Concrete 20Kg is manufactured from a co-extruded WPC core with a high-density protective cap, eliminating the warping, splintering, and annual re-oiling that plague natural timber decks. The hollow-core or solid-profile design reduces dead load on subframes while maintaining a Charpy impact resistance suitable for heavy foot traffic and commercial applications. Engineered to retain dimensional stability across Melbourne's full temperature range (−5 °C to 65 °C). Technical Specifications Material: Co-extruded WPC (HDPE + timber fibre) with polymer cap Section size: Slip resistance: AS 4586 Wet Pendulum Class W (P4 equivalent) UV stability: ΔE \u003C 3 after 3,000 h accelerated weathering (ISO 4892-3) Moisture absorption: \u003C 1 % (24 h immersion test) Design life: 25 years above-ground with zero chemical treatment Fire rating: Group 3 \u002F BAL-12.5 (verify with manufacturer for specific BAL rating) Fixing: Hidden clip system; concealed fastener compatible Colours: Multiple woodgrain finishes — see in-store swatch board Best Applications Residential decks and balconies requiring low maintenance Pool surrounds and wet-area decking Commercial outdoor dining and retail precincts Aged-care and disability-access walkways (slip-resistance compliance) Coastal properties subject to salt spray and wind-driven rain Delivery & Stock Composite decking displayed in-store at BuildBarn, 3 Eastlink Drive, Hallam VIC 3803. 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