Page 129

Technical Dayta Sheet Compedium

CONTENTS CONCRETE REPAIR CORROSION CONTROL GROUTS & ANCHORS PROTECTIVE COATINGS INDUSTRIAL FLOORING SURFACE TREATMENTS JOINT SEALANTS CONCRETE JOINTING JOINT FILLERS WATERPROOFING WATERSTOPS ROOFING TIMBER FLOORING ALPHABETICAL INDEX Preparation Foundation surface The substrate surface must be free from oil, grease or any loosely adherent material. If the concrete surface is defective or has laitance, it must be cut back to a sound base. Bolt holes or fixing pockets must be blown clean of any dirt or debris. Pre-soaking Several hours prior to grouting, the area of cleaned foundation should be flooded with fresh water. Immediately before grouting takes place, any free water should be removed. Particular care should be taken to blow out all bolt holes and pockets. Base plate / grout interface It is essential that this is clean and free from oil, grease, scale, paint or coating of any kind. Air pressure relief holes should be provided to allow venting of any isolated high spots. Levelling shims If these are to be removed after the grout has hardened, they should be treated with a thin layer of grease. Formwork The formwork should be constructed to be leakproof as Conbextra HF is a free flowing grout. This can be achieved by using foam rubber strip or Construction Silicone* beneath the constructed formwork and between joints. In some cases it is practical to use a sacrificial semi-dry sand and cement formwork. The formwork should include outlets for the pre-soaking water. The unrestrained surface area of the grout must be kept to a minimum. Generally the gap width between the perimeter formwork and the plate edge should not exceed 150 mm on the pouring side and 50 mm on the opposite side. There should be no gap at the flank sides. Mixing For best results a mechanically powered grout mixer should be used. When quantities up to 40 kg are used, a slow speed drill fitted with a high shear mixer with a minimum 1200W and between 300-650 rpm. The Protool MXP 1602 E mixer (product code: TT-621941) or equivalent is recommend with the Protool HS2 140 x 600 M14 Helical mixing paddle (product code: TT-614217) or equivalent. Larger quantities will require a high shear vane mixer. Do not use a colloidal impeller mixer. It is essential that machine mixing capacity and labour availability is adequate to enable grouting operation to be carried out continuously. This may require the use of a holding tank with provision for gentle agitation to maintain fluidity. The selected water content should be accurately measured into the mixer. Slowly add the total contents of the Conbextra HF bag, mix continuously for 5 minutes, ensuring a smooth, even consistency is obtained. Deeper grout pours Where grout gap depth is in excess of 125 mm up to 500 mm, Conbextra Deep Pour should be used. Placing Place the grout within 15 minutes of mixing to gain the full benefit of the expansion process. Conbextra HF can be placed in thicknesses from 10 mm up to 125 mm in a single pour when used as an underplate grout. Where the grouting gap beneath the base plate exceeds the maximum thickness allowed, then the grout can filled / bulked out with Conbextra Grout Aggregate* to minimise exotherm heat build up. Alternatively Conbextra Deep Pour is available for pours up to 500 mm thick. Filling/bulking out of the grout should not exceed a ratio of 1:1. Please refer to the Conbextra Grout Aggregate TDS for more guidance on bulking out of cement based grouts. Any bolt pockets must be grouted prior to grouting between the substrate and the base plate. Continuous grout flow is essential. Page 3 117 Fosroc® Conbextra HF Consistency of mixed grout The flow distances given below in (mm) are intended as a guide. Actual flow distances will vary depending on site conditions: Gap Depth (mm) Flowable 100mm head (mm) Flowable 250mm head (mm) Fluid 100mm head (mm) Fluid 250mm head (mm) 10 360 1200 900 2500 20 950 2600 1900 3000 30 1500 3000 3000 3000+ 40 2200 3000+ 3000+ 3000+ 50 3000 3000+ - -


Technical Dayta Sheet Compedium
To see the actual publication please follow the link above