The experience of using domestic non-corrosive anti glaze reagent ANC

O. Belov (SE “Ecoantiled”),
U. Kolesnik (Derzhdor SNU)

The experience of using domestic non-corrosive anti glaze reagent ANC

Annotation: the advantages of anti glaze using for deicing.
Key words: winter, anti glaze reagent

The entry

Winter is the hardest period for roads exploitation and traffic organization because of short days, low temperatures and glazing. Special deicing materials are used for every type of struggle with glazing. Chemical type is based on using reagents that touching snow and ice can make a liquid from it. This reagent mustn`t freezes during low temperatures. There is preventive method of chemical deicing when the anti glaze materials are spread on the surface and also removing the snow-and-ice bodies.

Body

It is a pity but today in Ukraine we chose the low-cost anti glaze materials and don`t pay attention on its damage effect on environment and engineering infrastructure. It leads to the soil pollution, damages the greens, activates the distraction of pavements, metal and reinforcement.

The actual problem for the road service is the right chose of chemical reagents for deicing and saving our environment.

The sodium salt and its mixtures are dangerous for ecology and cause the corrosion creation. You should remember that using sodium reagents to deice the cement-concrete surface is acceptable only in 1.5-3 year after its building. For example, using the sodium on the pavements in Europe is limited, and in Norway their using for deicing is forbidden from the end of the last century.

A great experience of using non-cloride, non-corrosive anti glaze materials in our country has operational aerodrome service. For decades non-corrosive preventive and deicing materials are used on concrete runways. Such materials contain carbamide, nitrates, acetates and additives.

The State Road Service of Ukraine recommends using eco friendly non-corrosive reagents, including ANC for preventing icing on the bridges and cement-concrete surfaces.

Table №1 Physicochemical characteristics:

No Indices name, measures Norm
1 Appearance White, yellow or gray granules
2 Mass share of calcium nitrate Ca(No3)2, % 37.5-40.6
3 Mass share ratio of carbamide and calcium nitrate 1.38-1.58
4 Moisture mass share, % no more than 0.80
5 Mass share of ammonium nitrate (NH4NO3), % no more than 0.5
6 Mass share of insoluble dirt in water, %, no more than
Including:
0.70
  Mass share of calcium carbonate CaCO3, %, no more than 0.45
7  Mass share of  surface-active neonol agent,% 1.5-3.0
18 Grain-size classification
Mass share of granules <1 mm, % not less
Mass share of granules 1-4 mm, %, not less
Mass share of granules diameter more than 4.0mm ,% no more than
5
93
2
9 Mealiness, % 100

 

The goal of this work is generalization of experience of ANC using for deicing in winter.
ANC is produced according to technical conditions (4).
Its main physicochemical characteristics are showed in the table №1. It is used in airports of Borispol, Lviv, Charkiv, Donetsk and in the near abroad – Baltic, Belorussia, Middle Asia. It is also efficiently used by operating services of marine ports.

ANC is a white or light colored granules with pour density near 0,9 t/m3, diameter 1-4mm., it doesn`t slump during guarantee term. Used for preventing and removing ice from the concrete, metal and asphalt surfaces.

ANC was tested in Dnepropetrovsk`s airport on the 150*20m. area with asphalt concrete surface. The ice in thickness 0,5-1,0mm. was made by pouring hot water on the cleaned surface. The reagent was spread on the tested place by machine PR-130 with the consumption rate up to 100g/m2. with the air temperature -40C. The efficiency of ice melting was estimated visually and with a help of brake carriage ATT-2 according to NASGA-86 method (estimated adhesion coefficient range).

Nable №2 Testing results of using ANC on the asphalt concrete surface.

Time passed from the moment the reagent touches the surface Adhesion coefficient on the surface with reagent
0 0.25-0.30
5 0.36
8 0.36
13 0.37
20 0.38
31 0.39
After one-time  using the brush machine on the surface with reagent 0.42
Dry asphalt concrete surface  without reagent 0.45-0.50
Wet asphalt concrete surface  without reagent 0.44


As we can see from the table№2, ANC is the most effective during first 5 min., it quite melts during first 20 minutes. One-time using of the brush machine PM-130 rises the adhesion coefficient to the figures almost the same with dry asphalt concrete surface without reagent.

Great experience of usage ANC in air and marine ports shows that equal spreading of recommended norms of reagent on the surface can be provided by sand spreading car RUM-3 machine. Instead of this car can be used tractor trail with wheel drive. The car must drive no more then 20km./hour. The spreading width of reagent is calculated according to road width and number of turns of the car`s wheel. The consumption of the reagent is calculated by the ice thickness and settled by dose measuring granule device on the disk.

For ice removing can be used brush machine which goes after the sand spreading car in 10-15 min. Time, when brush machine starts is calculated according to the ice thickness which must be removed.
 

Table №3. The average norms of ANC waste

Ice thickness, mm. Air temperature, ºC
0/-2 -2/-4 -4/-6 -6/-8 -8/-10
0.2 10 15 25 35 45
0.5 20 40 60 85 110
1.0 35 75 120 170 220
1.5 55 120 180 250 330
2.0 75 150 230 320 440

 

The main advantage of granulated ANC is fast ice distraction in the range temperature 0ºC to -12ºC without non-corrosive effect on the surfaces, also it doesn`t cause corrosion of the car bodies in contrast to the sodium materials.

All the components of reagents, including surface active materials, are very biodegradable, fully dissolved and don`t damage the environment. ANC is friendly to plants and can be used as a mineral fertilizer (5, 6). ANC is not toxic, flame proof and explosive proof.

Conclusion

The experience of using domestic ANC reagent let us to recommend it for wide usage by road services for deicing reinforced bridge. Use it on the roads which go through planted zones and parks and also in the zone with electric network.