1 Technical Data Sheet Renderoc hb40 . High performance, medium weight, very low shrinkage, patch repair mortar USES TECHNICAL SUPPORT. For the reinstatement of large areas of reinforced Concrete Parchem offers a technical support package to specifiers, where low permeability characteristics are required and end-users and contractors, as well as on-site technical where higher compressive strength is an important assistance. consideration. Renderoc hb40 has been engineered for the repair of columns and beams but, because of its relatively ADVANTAGES. low fresh wet density, is also suitable for soffits and other overhead repair work. The mortar can also be used for small, Maximum compatibility with Concrete of compressive localised patch repairs. strengths 30 - 45 MPa Where compatibility with lower strength Concrete is High-build applications possible while maintaining required, but low permeability and high-build higher compressive strengths - fewer cold joints characteristics are important, Renderoc HB25 should Frequently obviates the need for formwork be used.
2 For higher strengths Renderoc HB70 should be used. P. olymer-modification provides extremely low permeability to water, carbon dioxide and chlorides Important Note 1: When Renderoc hb40 is used in conjunction with Impressed Current Cathodic Protection or E. xceptional system of shrinkage compensation provides Norcure Realkalisation and Desalination methods, the long-term dimensional stability substrate bonding primer should be an OPC: Can be applied quickly and efficiently by wet spraying Water slurry mixed at a 2:1 ratio. One component, pre-bagged to overcome site-batched Polymer bonding agents should not be used. variations No steel primer should be applied. Please refer to Parchem for further advice. Contains no chloride admixtures Important note 2: Suitable for internal and external applications Renderoc hb40 is Potable water approved - complies to approved for use with Galvashield XP, AS/NZS 4020:2005.
3 With a resistivity <15,000 cm @ 28. days. STANDARDS COMPLIANCE. Renderoc hb40 has been tested and approved in DESCRIPTION. accordance with the Hong Kong Housing Authority Renderoc hb40 Concrete reinstatement mortar is supplied Specification TM1 to TM8 (1990) and ASTM C596-89. as a ready to use blend of dry powders which requires only (modified 23 C, RH50%). the site addition of clean water to produce a highly consistent, medium-weight repair mortar. It is based on Complies to AS4020 - Products in Contact with Drinking Portland cements, graded aggregates, lightweight fillers Water. and chemical additives which provide a mortar with good handling characteristics while minimising water demand. DESIGN CRITERIA. The low water requirement ensures good strength gain and Renderoc hb40 exhibits a series of performance long-term durability. characteristics designed to achieve maximum compatibility with Concrete with a compressive strength greater than 30 MPa.
4 PARCHEM Concrete REPAIR FLOORING JOINTING SYSTEMS WATERPROOFING. TECHNICAL DATA SHEET JULY 2013. 7 Lucca Road, Wyong NSW 2259 Phone 1800 801 108 ABN 80 069 961 968 1. Renderoc hb40 . Renderoc hb40 has been engineered for the repair of Modulus of elasticity in columns and beams, but, because of its relatively low fresh compression wet density, can readily be used for vertical and overhead ( : 1997): x 104 MPa repair work. It can be applied in sections up to 40 mm Water absorption ISAT thickness in vertical locations and up to 30 mm thickness in (BS 1881 Pt 5: 1970). overhead locations in a single application and without the 10 minutes: ml/m2/sec use of formwork. Thicker sections can be achieved by the 2 hours: ml/m2/sec use of formwork or can be built up in layers. Deep pockets can sometimes be filled in a single application dependent Dimensional Change (Drying shrinkage). on the configuration of the pocket and the volume of (AS - 2005): < 400 microstrain @ 7 days exposed reinforcing steel.
5 < 600 microstrain @ 28 days Build can be dramatically increased by wet spraying. Carbon dioxide barrier - Typical achievable thicknesses are 70 - 110 mm vertically equivalent thickness of and 60 - 85 mm overhead, although this will depend on Concrete to Renderoc substrate profiles and the distribution of steel reinforcement. hb40 @ 10 mm (Taywood method): 600 mm Consult your local Parchem sales office for further information. Chloride Diffusion, The material should not be applied at less than 10 mm Nordtest NT Build 443 x 10-12 m2/sec thickness. Diffusion Coefficient, De Where strengths below 30 MPa and/or higher builds are Coefficient of thermal required, Renderoc HB25 should be used. expansion: 11 x 10-6/oC. Setting time SPECIFICATION CLAUSES. ( - 1996). HIGH-BUILD Concrete REINSTATEMENT MORTAR initial set: 3 hours final set: 5 hours The reinstatement mortar shall be a single component polymer-modified, cement-based blend of powders to Fire rating which only the site-addition of clean water shall be (BS 476 Pt 4: 1970): Non combustible permitted.
6 It shall be manufactured to achieve maximum (Class 0 surface). compatibility with reinforced Concrete with a compressive Fresh wet density: Approximately 1780 kg/m3 strength greater than 30 MPa and as a consequence, shall dependent on actual exhibit the following characteristics when tested to the consistency used standards shown. Chemical resistance: The low permeability of Renderoc hb40 severely retards chemical PROPERTIES. attack in aggressive environments. The following results were obtained at a water:powder ratio The cured mortar is highly of and a temperature of 20 C unless otherwise stated. impermeable to acid gases, water TEST METHOD TYPICAL RESULT borne chloride ions, and oxygen Compressive strength The mortar shall be capable of achieving the following (AS - 2005) application thicknesses in a single layer. dry cure: 10 MPa @ 1 day Vertically Overhead 25 MPa @ 7 days 35 MPa @ 28 days by hand/trowel: 40 mm 30 mm Modulus of Rupture (Flexural strength) by wet spraying: 70 - 110 mm 60 - 85 mm (AS - 2000): MPa @ 1 day Renderoc hb40 manufactured by Parchem, meets these MPa @ 7 days requirements.
7 MPa @ 28 days Indirect Tensile strength Note: Compressive strengths stated above were measured (AS - 2000): MPa @ 1 day using 70mm cube samples. Test results obtained will vary if MPa @ 7 days testing is carried out to an alternative standard or sample MPa @28 days dimensions are used. 2. Renderoc hb40 . APPLICATION INSTRUCTIONS Note: Nitobond HAR primer is generally not used when wet spraying Renderoc hb40 . Refer to the separate information PREPARATION document Wet Spraying Renderoc mortars available from Saw cut or cut back the extremities of the repair locations to Parchem branches. a depth of at least 10 mm to avoid feather-edging and to provide a square edge. Break out the complete repair area MIXING. to a minimum depth of 10 mm up to the sawn edge and Care should be taken to ensure that Renderoc hb40 is 20mm behind any exposed reinforcement steel. thoroughly mixed. A forced-action mixer is essential.
8 Mixing in a suitably sized drum using an approved spiral Clean the surface and remove any dust, unsound or paddle in a slow speed (400/500 rpm) heavy-duty mixer is contaminated material, plaster, oil, paint, grease, corrosion acceptable for the occasional one-bag mix. Free-fall mixers deposits or algae. Where breaking out is not required, (cement mixers) must not be used. Mixing of part bags roughen the surface and remove any laitance by light should never be attempted. scabbling or abrasive-blasting. For normal applications, place - litres of drinking Oil and grease deposits should be removed by steam quality water into the mixer and, with the machine in cleaning, detergent scrubbing or the use of a proprietary operation, add 1 full 20 kg bag of Renderoc hb40 and mix degreaser. The effectiveness of decontamination should for 3 - 5 minutes until fully homogeneous. Note that the then be assessed by a pull-off test.
9 Powder must always be added to the water. Initially add Expose fully any corroded steel in the repair area and litres of water, mix the product for a minimum 3 minutes to remove all loose scale and corrosion deposits. Steel should allow the polymers in the mix to activate; then make any be cleaned to a bright condition where possible, paying necessary water adjustments after this time up to the particular attention to the back of exposed steel bars. maximum litres. Abrasive-blasting is recommended for this process. APPLICATION. Where corrosion has occurred due to the presence of chlorides, the steel should be high-pressure washed with Exposed steel reinforcing bars should be firmly secured to clean water immediately after abrasive-blasting to remove avoid movement during the application process as this will corrosion products from pits and imperfections within affect mortar compaction, build and bond.
10 Its surface. Apply the mixed Renderoc hb40 to the prepared substrate by gloved hand or trowel. Thoroughly compact the mortar REINFORCING STEEL PRIMING on to the primed substrate and around the exposed Apply one full coat of Nitoprime Zincrich and allow to dry reinforcement. Renderoc hb40 can be applied in sections before continuing. If any doubt exists about having up to 40 mm thickness in vertical locations and up to 30. achieved an unbroken coating, a second application should mm thickness in overhead locations in a single application be made and, again, allowed to dry before continuing. (If and without the use of formwork. Thicker sections should Galvashield XP are to be embedded into the Renderoc be built-up in layers but are sometimes possible in a single hb40 patch repair, refer to current Galvashield XP Technical application dependent on the actual configuration of the Data Sheet for priming instructions).