Sparkle Grain is recommended where you want a decorative, hard, nonslip surface. The glitzy grit is designed for light to heavy usage on floors, patios, walkways, driveways, steps and ramps in places from homes, shopping centers and wineries to museums, schools and stores. They can also be as heavy as three seedings. You should apply it after you have screeded, wood floated, magnesium floated and troweled the concrete.
Regardless of the method, for best results, the crew member with the best hand and eye coordination should broadcast the product. The same goes for applying the sparkle grain mechanically with a hopper gun you can get from any local building supply store. Whoever does the broadcasting, Ralston says, needs to know exactly what consistency the owner, architect or project manager wants on the slab— light, medium or heavy.
Ralston says he has had good results with a compressor that operates at 2. He advises installers to do a sizable mock up. His suggestion is to mock up a space that reflects the targeted coverage before sending out a crew for an actual job. This will ensure that the application is meeting the desired consistency.
Subsequent broadcasts can be applied after each trowel procedure has covered up the product. Finishers should treat Sparkle Grain the same way they would other exposed aggregate.
Ontario's road guidelines are silent on it. Hesp's research group discovered oil in asphalt when they started to find metals, such as zinc, in roads that had failed. Motor oil is a lubricant, so the pavement that contains it loses resiliency — it becomes stiff, brittle and cracks more easily as temperature changes.
The trouble, Hesp says, is that asphalt with recycled oil passes "Mickey Mouse"-quality tests — where a paint can of the hot mix is cooled for an hour and then they measure how stiff it is. The asphalt with oil actually performs better in that test than the asphalt without it. Asphalt wholesalers are allowed to add up to 20 per cent of other recycled materials — such as ground-up pavement taken from old roads and recycled asphalt shingles — to the mix, Hesp says.
And the City of Kingston has had success using pavement without motor oil, Hesp says. So far, there are fewer repairs than last year. The city says it does not allow recycled oil in its pavement — but Hesp says that change was just made within the past year. Early glasphalt projects used high percentages of glass greater than 25 percent by weight of the mix with coarse glass gradations greater than Current data suggest that the use of high glass percentages and large particles of glass probably contributed to most of the stripping and raveling problems that were reported during the early test pavement demonstrations of the 's and 's.
The high angularity of cullet, compared with rounded sand, can enhance the stability of asphalt mixes where properly sized cullet is used. Stabilities comparable and, in many cases, better than conventional mixes have been reported. When used in asphalt concrete, glass processing must include the removal of ferrous and nonferrous metal, plastic, and paper. Although percent removal of all paper, plastic, and debris from postconsumer glass streams is unlikely, an acceptable glass product can be achieved in most instances, particularly if mix designs limit glass to 10 to 15 percent of the mix.
Some of the glass properties that are of particular interest when glass is used as fine aggregate in asphalt paving include gradation, specific gravity, and durability. Gradation : Waste glass used in asphalt surface pavements should be processed to a fine aggregate size less than 4. Specific Gravity : Due to a specific gravity approximately 10 to 15 percent below conventional aggregates, waste glass can be expected to provide a greater yield more volume of asphalt concrete per ton.
Durability : Glass is a brittle material and coarse particles greater than 4. Consequently, it is preferable to process crush and screen waste glass into a fine aggregate size, which is minus 4. Some of the properties of an asphalt mix containing glass that are of particular interest include frictional properties, mix stability, stripping resistance, and reflectivity.
Frictional Properties : Skid resistance tests results that have been reported have shown waste glass pavements to fall within recommended skid resistance testing limits.
This is a positive feature, particularly where vehicular braking and acceleration are considerations. Stripping Resistance : Glass is not absorptive and bonds poorly to asphalt binder.
Antistripping agents such as hydrated lime introduced as 2 percent of the aggregate mix by weight have been used in previous demonstrations to reduce potential stripping problems. Poor immersion-compression test results retained stability , a measure of the potential for stripping problems, can also be expected where a high percentage of oversized glass particles are introduced into a mix. Reflectivity : Large percentages of glass in a surface pavement greater than 15 percent by weight produce a noticeable increase in the reflectivity of the pavement.
Depending on the size of the glass particles, this could produce a noticeable glare, particularly on wet pavements. Smaller glass particles and lower percentages of glass can help to reduce reflective glare problems. Asphalt mixes containing crushed glass can be designed using standard laboratory procedures.
Currently most highway departments allow the use of 5 to 10 percent glass in their asphalt mixes. Although some areas use 6. The City of New York has lowered its specified gradation top size in its mix design to minus 9.
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