1 Lokfix constructive solutions Polyester resin grouts Technical support Uses Fosroc offers a comprehensive range of high performance, Lokfix are used for high strength corrosion resistant anchoring high quality concrete repair and construction products. In of bolts and bars from 12 - 51mm diameter into concrete, addition, Fosroc offers technical support service to specifiers, rock, masonry or brickwork where high speed of installation end-users and contractors, as well as on-site technical and early application of load is required. assistance in locations all over the country.
2 Permanent installation of reinforcement starter bars, foundation bolts, base plates, balustrading, barriers and safety Design criteria fences, railway tracks, tie-back anchors, reinforcement The version of Lokfix grout to be used will depend upon dowelling abutments, ground anchors for towers, cranes, ambient temperature and anchor conditions. dock sills. The high strength of the cured resin permits strong anchors Advantages to be created. The ultimate bond strength developed depends Rapid strength gain upon: Vibration resistant Strength of host material Corrosion resistant Length of resin bond to bar Non expansive Hole preparation and formation Can be placed under water Type and dimension of bar Standards and specifications The following formula may be used to determine the minimum depth of installation for Type 1 rebar bolts, to ensure the shear Materials tested in accordance with stress within the concrete is kept within the limits set out in BS 4551 BS 8110.
3 BS5080 Minimum hole . Pd21 = =. depth (mm) SPd2 4 Sd2. BS2782. where Y is characteristic yield strength of steel Description (460 N/mm2 ). The three versions of Lokfix polyester resin grout are all pre- S is permitted shear stress in concrete (N/mm2). measured, two part, filled polyster resin grouts. After d1 is bar diameter (mm). hardening the grout produces anchorages of consistent d2 is hole diameter (mm). reproducible values. This formula is used typically as shown in Table 1. The versions are : Table 1. Lokfix L ( Large aggregate). Minimum hole depth Lokfix S ( Small aggregate).
4 Characteristic concrete Lokfix P ( Pumpable grade) strength (N/mm2): 20 25 30 > 40. Lokfix L is used where hole diameter exceeds bar diameter Permitted concrete shear by 25 to 50mm. stress using Type One Bar Lokfix S is used where the difference between the hole (N/mm2): diameter and bar diameter is < 25mm. Bar Yield Hole Lokfix P is used in overhead or horizontal holes where bar / diameter (tonnes) diameter hole relationship conforms to Lokfix polyester resin grout S. (mm) Minimum hole depth (mm). The thixotropic nature of Lokfix polyester resin grout P reduces 12 20 280 250 225 200.
5 Flow of grout out of the hole. 16 20 490 445 400 355. 20 25 615 555 500 440. 25 32 750 675 615 540. 32 38 1035 930 845 745. Lokfix . 40 45 1365 1225 1115 980. Lokfix . Properties Note : The graph illustrates typical failure loads. Minimum safety factors of in non critical and of 2 in Gel time Gel time Minimum time critical cases should be considered for design purposes. Temp(0C) (min) required before Wherever relevant, the local code of practice or standard loading ( hours) must also be considered in relation to anchorage length. 20 80 7 Hole preparation and formation 30 40 3 Optimum performance of Lokfix requires rough sided, dust 40 15 1 free holes.
6 Uses of rotary percussive drills with air or water flushing is recommended. Diamond drilled holes should be under-reamed unless Compressive strength : After the minimum time required necessary safety factors are incorporated. before loading the grout typically attains a compressive strength in excess of 20N/mm2 and an ultimate compressive Cast holes should preferably be inverse dovetail strength of 70N/mm2 in 7 days ( 50mm x 50mm x 50mm) configuration. If parallel sides holes are cast they should when tested as per BS 6319 Part 2 : 1983. be rough to provide adequate keying.
7 Chemical resistance : The cured resin is resistant to fresh Bar preparation and salt water, petrol, oils, grease and most acids, alkalis All bars should preferably be degreased and all flaky rust and solvents. removed. Application instructions Mixing A complete pack of resin and catalysed filler should be Selection of grout version mixed in one operation. Mixing may be carried out The version of Lokfix chosen will depend on anchor conditions mechanically. When a smooth, even consistency is ( see description) achieved the grout is ready for use and should be placed Parameters of anchor design well within the gel time of the grout ( See properties).
8 The high strength of the cured resin permits strong anchors Packs have been designed to produce practical and to be created. Ultimate strength is determined by : economic volumes of grout. Strength of host material Do not attempt to mix partial pack components. Length of resin bond to bar Installation Hole preparation and formation Lokfix polyester resin grout S & L. Type and dimension of bar Using the calculated volume of grout based on Table 1, the Typical loads attained grout should be poured steadily into the prepared holes. The anchor bar is then pressed into the hole to the required depth.
9 Slight agitation of the bar will assist in achieving a complete bond. The bar should then be left undisturbed in the required position until the resin is set. Lokfix polyester resin grout P. The grout should be injected to the rear of the hole to avoid air entrapment. The thixotropic nature of Lokfix P will prevent significant flow of resin out of the hole. Cleaning Concrete : 20N/mm2 unreinforced Any mixing drums, pumps, etc. should be cleaned within Bar : 25mm dia Deformed rebar to IS:1786 the pot life of of the grout. Nitoflor Sol is available for this 32mm dia hole: Air-flushed rotary percussive drilled purpose.
10 Lokfix . Table 1 Precautions Quantity estimating guide Fire resistance and creep Table indicates volume of Lokfix polyester resin grout grout in At operating temperatures above 400C, the creep of Lokfix cm3 /100mm bond polyester resin grout resin under load may become significant. Resin anchors should not be used where Hole diameter Bolt diameter mm structural load bearing performance has to be maintained in mm 12 16 20 25 32 40 anchors subjected to fire conditions. 20 25 Health and safety instructions 25 50 40 25 Confined areas must be well ventilated and no naked flames 32 80 70 60 40 allowed.