Masonry Magazine June 1968 Page. 20
Actane Method Of Waterproofing
A new method of grouting damp masonry by the pressure injection of latex-siliconate compositions, developed by an English scientist, has shown unique effectiveness in the damp proofing of such varied applications as bulk brickwork, concrete, defective tanking, basements, underground tunnels, asphalt roofing, cracks in concrete, and porous and cracked masonry surfaces.
Actane, as this new development is called, also is reported to be cheaper and easier to apply than conventional grouting techniques. Grouting to prevent water penetration or seepage for many years has been based on the injection of cement mixes.
Cement grouting is good as far as it goes, but suffers from certain inherent defects that the new latex siliconates have been designed to overcome.
Being rigid, the cement may crack after injection and, while cement mixes can block fairly wide cracks or channels, they cannot reach the narrower irregularities which may act as independent water conducting systems. Thus, cement grouting may stop or reduce local seepage without remedying the more serious internal defects in the masonry.
The new Actane latex-siliconate grouting process does exactly that. Dr. H. Hurst, who developed the technique, says in an article in the current issue of Rubber Developments, Journal of the Natural Rubber Producers' Research Association, that the combined waterproofing effect of the natural rubber latex and the siliconate components provide full penetration damp-proofing in a range of applications where traditional methods of grouting with cement would have been impracticable.
When a latex-siliconate fluid is brought into contact with porous masonry, the waterproofing action depends on two factors which operate after initial absorption has taken place (1) there is a progressive blocking of the pores by the aggregation and coalescence of rubber paticles within the pores, (2) the rubber aggregates are stabilized within the pores by the slower development of water repellency, which involves the condensation or polymerization of the siliconate into a silicone resin lining the pore surfaces.
In a typical treatment, holes are drilled in masonry joints at suitable intervals, spaced to insure a continuity of damp-proofed areas. An initial injection through each hole is made under pressure with a latex-siliconate of relatively low rubber content to insure maximum penetration into the finer cracks or pores remote from the site of injection.
The process is then repeated using latex-siliconate containing progressively higher proportions of latex until the larger defects have been sealed. In this way the material spreads through the complete network of joints and within the treatment area, providing the all-encompassing waterproofing that is an outstanding characteristic of this new process.
Relatively wide cracks can be grouted with a latex-siliconate cement slurry. This sets to form a gap-filling medium which has high adhesion to the internal surfaces of contact while retaining flexible properties an important factor in structures subjected to continuous traffic or other vibration.
The current issue of Rubber Developments contains a full illustrated report on Actane's new approach to waterproofing grouting, that spells out in detail how to apply latex siliconate in a wide variety of applications. For a free copy, write Natural Rubber Bureau, 1108 16th St., N.W. Washington, D.C. 20036.
3 ft. charge and 3 ft. discharge height
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• June, 1968
20