What is ROADMASTER?
ROADMASTER is a calcium chloride based composition used for the treatment of unpaved surfaces for dust control and for its stabilization.
How does ROADMASTER work in controlling dust emission?
ROADMASTER is hygroscopic (moisture absorbing) and deliquescent (moisture retaining). When applied to the unpaved surface, it coats fine and coarse particles, aggregating them together. ROADMASTER coated surfaces become hygroscopic and deliquescent. The aggregates remain moist and prevent captured fine particles from being airborne when disturbed.
How does ROADMASTER work to stabilize the unpaved surface?
Fines are the cementing materials for the aggregates of the unpaved surface. ROADMASTER treatment retains these fines in the aggregate and increases the cohesion between them, resulting in high-density compaction and improved durability of the surface. As the ROADMASTER treatment allows moisture to be retained into the unpaved surface material for longer periods, the surface can be compacted to maximize its density.
Does ROADMASTER really improve the unpaved surface quality while reducing the total maintenance costs?
It provides dust control and stabilization benefits at the lowest total cost, compared to alternative products and application methods. ROADMASTER treatment results in the formation of several inches of dense surface. This surface requires less maintenance by substantially reducing the number of required bladings, preventing the loss of aggregates and reducing the spot repairs due to frost heaving. Furthermore, unlike in the case of other products, ROADMASTER treated surfaces can be bladed as required without losing the benefits of the treatment.
What kind of equipment do I need to use for ROADMASTER?
ROADMASTER can be applied by a water wagon or by an oil dispenser. However, a specially designed and constructed ROADMASTER applicator truck is preferred.
When is the best time to apply ROADMASTER to the unpaved surface?
ROADMASTER can be applied year round, but at a slightly lower concentration during the winter months due to higher crystallization temperatures that exist in the higher concentration products. For example, the crystallization temperatures for 38, 35 and 30 percent by weight concentrations are about 42oF, 14.5oF and –50oF, respectively.
If it is only applied once a year, late spring is recommended because, at that time of the year, the unpaved surface still contains enough moisture.
How long will ROADMASTER last in the treated surface?
Longevity of the application of ROADMASTER is dependent upon the characteristics of the unpaved surface and the traffic volume. Normally, a once a year application is adequate on low traffic volume unpaved county roads. A booster application may be necessary on heavily traveled roads.
What is the appropriate ROADMASTER application rate?
Application rate is dependent upon the composition of the unpaved surface material. Normally the range is from 0.27 to 0.40 gallons/sq. yd. A 4,000-gallon truck load will typically treat 1.2 miles of a 16 ft width strip.
Is ROADMASTER applied at the strength delivered to the customer?
ROADMASTER is typically applied at full strength, as delivered. A Certificate of Analysis and the Bill of Lading accompany each load of ROADMASTER shipped to the customer.
Do I need to prewet the surface before applying ROADMASTER?
Usually it is not necessary, but a prewet damp road will allow ROADMASTER to soak into the unpaved surface at an improved rate.
Do I need to keep the unpaved area closed to traffic during or just after the application of ROADMASTER?
No. The area does not have to be closed to traffic. The section being treated could be used immediately after the application of ROADMASTER. The movement of traffic will actually improve the compaction of the surface. In fact, no additional compaction is required after the unpaved surface has been treated.
Do I need to scarify the surface before the application of ROADMASTER?
Scarification is recommended, as it will improve the penetration of ROADMASTER into the unpaved surface and will increase the compaction density and ultimate stability of the treated area.
When should I add new materials to the unpaved surface?
Add new materials when the fines content (minus 200 mesh) is low (less than 10 percent by weight). This is not uncommon in untreated surfaces, as the fines are easily removed by wind and by the moving vehicles. Because fines are the cementing materials which bind the larger gravel, a surface that is devoid of or is low in fines content loses coherence and becomes raveled.
What is the best kind of material to use as surface material on unpaved surfaces for the most effective function of ROADMASTER?
Limestone with fines (minus 200 mesh) content greater than 15 percent by weight is recommended. The percentage of large gravel (plus 3/8 inch) needs to be maintained at low level. Preferably, there should be no material larger than 1 inch. Material primarily composed of sand also needs to be avoided.
How important is the maintenance of the ditches along side the unpaved roads?
Ditches filled with gravel and vegetation impede water flow during rain, and can lead to flooding of the road surface. With time, this flooding could wash away the fines in the roadbed, rendering it unstable. For better drainage, it is also important that road surface is graded, leaving a crown in the center of the road. The ditches should be pulled during the preapplication process to gather lost aggregates and to allow the free flow of the draining rain water.
Can I apply ROADMASTER over old chip and seal or broken up asphalt?
Yes, as it will reduce the dust level. However, a complete treatment of the bed with ROADMASTER will provide better cohesion and render more stability to the surface. This will require scarification and/or pulverization of asphaltic materials and the aggregates, which is blended with the native material prior to the application of ROADMASTER.
Is ROADMASTER corrosive?
A combination of moisture, air and bare metal are generally necessary to cause corrosion. Studies have shown that an unpaved surface treated with ROADMASTER is kinder and less detrimental to vehicles than an untreated unpaved surface.
What are the safety and environmental benefits of using ROADMASTER?
By drastically reducing the dust emission, treatment with ROADMASTER improves visibility for the motorist. It also eliminates health hazards otherwise posed by the dusty air environment, and improves the comfort level of residents and workers along the roadside. When properly applied, ROADMASTER is environmentally safe for the soil and roadside vegetation. Calcium is a macronutrient, essential for all organisms. It is readily abundant in the diets of mammals.