The challenges of the road flooring and the birth of the asphalt cement
In the sector of Driving flooring subjected to some heavy synergistic components such as heavy traffic, frost cycle, saline attack Near the sea and chemical resistance to the decongetary salts, it has made its way, now for almost twenty years, the semi -rigid floor technologymade by composing the elastic deformability characteristics of the bituminous flooring with the performance resistance of the concrete roar, addictive with silica.
THE’Cement asphalt It is thus being a Cementitious premiece based on microcalcestruzzo with reactive silic and fine mineralsused for the packaging of a Fluid and sliding roarcharacterized by compensation of the reinamic withdrawal, by high resistance and durability and intended for highly draining asphalical flooring with open porosity of 25 ÷ 30%.
The product is Colable in the macropores of bituminous conglomerates and is used both for the construction of a new high -performance floor of the usurant typesubject to considerable thermal changes, both for the restoration of asphalted flooringcharacterized by extreme environmental conditions, supported and heavy traffic, found in airports, in the docks of the piers, in logistics and in the interports.
Characteristics and advantages of the Cement Asphalt
There Cement asphalt technology It is addressed to All semi -flexible floorscharacterized by very intense traffic, subject to heavy loads, for handling on rubberized wheels, thus coming to increase the Even extreme stresses resistanceburdens on the wear mat of the bituminous mantles that are subject to:
- Phenomena of fatigue for the cyclicality of the vehicular passages, including channeled ones, (airports, port plates, large logistical centers), with anti -solution characteristics;
- Starting of distributed loads, such as containers, pallets (airports and port docks), maintaining elasticity and planarity;
- Galo hot combinations (port airports and docks), avoiding the formal scatter and swelling;
- Presence of chlorides on the surface coat both for the presence of the sea as for the spreading of decongental substances (airports and port plates, logistical centers), avoiding phenomena of surface disintegration;
- Loss of fuels and oily substances (airports, and port docks), minimizing spots and viscous areas;
All these stresses in the medium/long time produce a series of on the asphalt mantle enchantingdistinguished by the flaking of the usury mat, and in the most serious cases, of the crumbling of the layer of binder, attributable to the loss of cohesion of the bituminous binder, with the consequent expulsion of theert, and the formation of holes on the lower layer of the Macadam.
Design, restoration and applications of the Cement Asphalt
In cases of functional restoration Once the need to restore the wear mat is highlighted, the intervention of technological and functional improvement involves the study of the state of the places, the structural calculation with respect to the loads, the definition of technical specifications on the intervention and the determination of the maintenance and restoration plan.
The restoration/consolidation intervention of the bituminous structures must be defined according to the stratigraphy and the lift of the land on which the bituminous floor system is inserted. Technologically the asphalt cement, is configured as a Bitulo-Cementizio conglomerate composed of:
- a Bituminous screed of crushed stonecoming from effusive volcanic rocks, such as porphyes and basalts, drained, high porosity,
- in which it comes poured a premiscelate in the status of sliding sliding low viscosityon a cement basis, with the addition of silica, such as to obtain a synthesis product characterized by very high mechanical resistance;
- The final product is therefore characterized free of retirement, without formation of bleedingextremely resistant to the heavy and cyclical use of heavy vehicles, in conditions of frost cycle and disgela, resistant to saline and chemical aggression, without formation of both structural and contraction joints, and rapid drying to use.
In the composition of the bituminous conglomerate“Open Grade” It is necessary to create a mix design of inert, such as to reach the 25/30% of air presencewhose voids will be filled subsequently with the cement compound.
The concrete asphalt system was born as highly performance productfor the regeneration of the slopes and the airport rolling areas, and then be diverted to all those heavy and heavy circulation activities, such as docks of ports, industrial warehouses with ground load, urban roads areas subject to heavy traffic, highway quays. The product is characterized by a surface equipped with griptherefore capable of increasing the adherence of the rubberized wheels on the sliding plane, especially in the presence of water.
The product was tested and subsequently applied by the new, in all the situations in which a product with very high and varied performance was required: construction of new dating tracks and take -off at the airports, new port plates, new parking areas for autenin, floors for loads on the ground of warehouses intended for storage on the ground, with handling loaded on rubberized mutlets.
Mechanical performance and conclusions
The mechanical resistances of the cement of the sliding boyish state reaches the compression values of 25-45 MPA, i.e. 250-450 kg/cmq, with 28-day values that reach 100 MPA, i.e. 1000kg/cmq.
The cement asphalt system is characterized by 2 types of mat thickness:
- thickness 3 – 5 cm
- thickness 4 – 6 cm
THE laying plans of the Asphalt Cement System can be extremely diversified in application cases, intended for the creation of a highly performance scroll plan for limit situations compared to a traditional bituminous conglomerate such as microcalcestuzzi with reactive and fine mineral silicos, with reactive silic and finely colorful minerals, with reactive and mineral silic whales drying and with reactive silicists and mineral silicos and mineral minerals photocatalytic.
Finally, it should be noted that, being a semi -rigid flooring, It can bear static loads but not shelving anchored on the ground via dowelsbecause being the semi -lastical support is labile to resistance and stability to cutting efforts.
