Substrates
| Cement and Asphalt Pavement: Slurry Surfacing is a versatile and durable product. It is a cold mixed asphaltic concrete that is based on an asphalt emulsion. When applied to a road surface the wet slurry is a mix of water, aggregate, additives and emulsion. The cationic emulsion has a positive surface charge. All aggretae surfaces when wet have a negative charge- even limestone or cement. Although cement is positive dry. |
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The additives are aimed at slowing down this reaction or speeding it up. Also absorbent surfaces will take water from the emulsion making it coalesce faster. This means that for cement pavements the surface needs to be wetted but as long as the pavement is sound and the mix has enough emulsion it will stick. In an asphalt pavement this reaction occurs with the exposed aggregate and , of course, the asphalt will stick to the asphalt- no matter where that asphalt came from (emulsion of any type, polymer or rubber modified, spray seal or hotmix). Cement is a hard and unyielding surface so grinding is more likely of the slurry surface. Thus on cement always use an extra 1-2 lb per yd2 of mix. SBR latex is a mainstay of adhesives and often used in cement mixtures to bond them to metal reinforcement. So Polymer Latex modified emulsions are even better in adhering to cement. They are also more durable. See our specifications library for extra information. Slurry will, if properly formulated and applied, stick and wear for many years. Bridge decks in California have had life spans of 15 years and some longer. |
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  Slurry Polymer Modified on Bridge and Ramp Concrete Surfaces |
Last Updated (Monday, 14 December 2009 17:06)