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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 Application Instructions 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 It is essential that this is clean and free from oil, grease, paint or scale. 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 HES is a free flowing grout. This can be achieved by using foam rubber strip or Construction Silicone sealant 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 150mm 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 the 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 HES bag, mix continuously for 5 minutes, ensuring a smooth, even consistency is obtained. Placing Place the grout within 10 minutes of mixing. Conbextra HES can be placed in thicknesses from 15 mm up to 150 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. Continuous grout flow is essential. Sufficient grout must be available prior to starting and the time taken to pour a batch must be regulated to the time taken to prepare the next one. The mixed grout should be poured only from one side of the void to eliminate the entrapment of air or surplus pre-soaking water. This is best achieved by pouring the grout across the shortest distance of travel. The grout head must be maintained at all times so that a continuous grout front is achieved. Curing On completion of the grouting operation, exposed areas should be thoroughly cured. This should be done by the use of a Concure curing membrane, or the continuous application of water and/or wet hessian. Cleaning Conbextra HES should be removed from tools and equipment with clean water immediately after use. Cured material can be removed mechanically. Limitations Low temperature working When the air or contact surface temperatures are 15°C or below on a falling thermometer, warm water (30°C ) is recommended to accelerate strength development. For ambient temperatures below 15°C the grout consistency should be flowable and the formwork should be maintained in place for a minimum of 24 hours. Normal precautions for winter working with cementitious materials should be adopted. Page 3 125 Fosroc® Conbextra HES


Technical Dayta Sheet Compedium
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