Anchoring grouts: polyester

Technologies offered by unsaturated polyesters to the construction industry are directed at specific areas such as anchoring grouts, resin mortars and concretes, coatings and lighting sealants. The properties that make unsaturated polyesters more useful for construction are (Boeing, 1964 Demmler and Schlag, 1971 Manson, 1985) ... 

Polyester anchoring grouts are used mainly for securing bolts, bars, tendons or dowels in drilled or formed holes in concrete, masonry or natural rock. They are particularly suitable where rapid installation and rapid strength gain are required. They are also used in areas where a high degree of corrosion protection is needed. 

Polyester anchoring grouts are supplied in two components, consisting of measured quantities of resin base and catalysed filler. The two components are mixed before application. 

Polyester anchoring grouts are of two types pourable grouts and thixotropic grouts. Pourable products are designed for vertically downwards or declining anchor holes prior to insertion of the anchor unit. The... 

Specific areas of application for polyester anchoring grouts are (Fosroc International, undated a) ... 

Polyesters and expoxies have been used to seal cracks in rock formations and to anchor rock reinforcement members in drilled holes. The mechanical properties of these materials are much better than those of Portland cement. However, the chemicals are (relative to other grouts) very expensive and very viscous. Rendering them less viscous by using diluents so that they will penetrate sands makes them even more expensive. Because of their limited application as grouts, polyesters and epoxies are not detailed further. 

There are two basic methods by which steel bolts and bars may be anchored into concrete, masonry or brickwork utilising epoxy or polyester resin grouts(5). The first involves inserting a deformed bar or bolt into a preformed or drilled hole into which the resin grout has been poured (Fig. 7.3). 

A preacceierated, thixotropic, rapid gel and cure, orthophthalic polyester specifically designed for anchor bolt fixing, mortar and grouting. 

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