: 35-41
Lviv Polytechnic National University, Department of building production
Lviv Polytechnic National University, Department of building production

The article is devoted to the problems associated freeze with the calculated estimation of the parameters of the structural and heat-insulating antifreeze layer in the subgrade of non-rigid roads on various soil bases. The main physical, technical and deformation characteristics of monolithic dispersed non-autoclaved foam concrete reinforced with polypropylene fiber of grades of density from
600 to 1000 kg/m3 are investigated. Freezing of subsoil waters directly under the roadway pavement and, as a result, its increase in volume, leads to significant deformations of the road surface. Under such conditions, the period of defectfree operation of the roadway pavement is significantly reduced, which in turn leads to the need to repair it in a more intensive mode. One of the ways to reduce the operating cost and maintenance costs of the road transport infrastructure is to introduce into the design and construction practice new structural concepts for road surface dressing that ensure high quality pavement during the normative operational period. This can be achieved by introducing an effective heat-insulating material into the pavement structure as an anti-frost layer in order to elimi-nate the effect of frost lift of the roadway pavement of non-rigid roads. Since domestic and foreign experience freeze in the road construction has proven the effectiveness of the use of heatinsulating materials in the road surface dressing construction, in recent years in Ukraine there has been increased interest in the use of non-autoclaved foam concrete as a modern and highly effective heat-insulating material in road construction. The installation of a heat-insulating layer made of non-autoclaved foam concrete allows us to completely or partially prevent freezing or overheating of the surface dressing base, reduce the influence of periodic variations in environmental temperature, which in turn will increase the durability of the pavement structure. The publication presents nomograms for determining the optimal thickness of the heat-insulating anti-frost heavy course (layer) of road surface dressing (based on sand, loamy sand, clay and loam) done at the street and road network for all climatic and geographical regions of Ukraine.

Kadela M., Kozłowski M., Kukiełka A. (2017). Application of Foamed Concrete in Road Pavement - Weak Soil System. Procedia Engineering. No. 193. pp. 439-446.

Verba V., Hornikovska I., Demchyna K., Volotsiuha V., Holyk V. (2012). The relationship of strength and deformation characteristics of non-autoclaved foam concrete. Bulletin of the Donetsk Na-tional Academy of Civil Engineering and Architecture "Modern Industrial and Civil Engineering", Book No. 8, Issue No. 1, pp. 28-35

Fedorowicz L., Kadela M., Bednarski Ł. (2014). Modeling foam concrete behavior in layered constructions cooperating with the subsoil. Scientific notebooks of the technical school in Katowice, Issue No. 6. - pp. 73-81.

Doroshenko O., Doroshenko Yu., Chyzhenko N. (2006). Fiber concrete as an effective mate-rial for transport construction. Journal "Road Transporter аnd Road Constructor of Ukraine", Issue No. 6, pp. 29-32.

Pukharenko Yu. (2006). Properties and prospects of the use of cellular fiber-reinforced con-crete. Popular Concrete Science, St. Petersburg, Issue No. 4, pp. 50-53.

Martynenko V. (2002). The influence of technological parameters on the properties of insulat-ing foam concrete. Bulletin of the Prydniprovska State Academy of Civil Engineering and Architec-ture, Issue No. 5, pp. 41-50.

Namsone E., Šahmenko G., Korjakins A. (2017). Durability Properties of High Performance Foamed Concrete.Procedia Engineering, Vol. 172. pp. 760-767.

Kahanov V., Hornikovska I., Ivasiv I. (2010). Operational characteristics of the anti-frost heavy course (layer) of non-rigid road surface dressing made of monolithic non-autoclaved foam con-crete. Construction Materials and Products, Issue No. 3, pp. 21-23.

Fukang D. (2013). Mechanical properties and energy-saving effect of polypropylene fiber foam concrete. Research Journal of Applied Sciences, Engineering and Technology. Vol. 6. No. 11. pp. 2012-2018.

Solodkyy S., Kahanov V., Hornikovska I., Turba Y. (2015). A study of fracture touchness of heavy-weight concrete and foam concrete reinforced by polypropylene fiber for road construction. Eastern-European Journal of Enterprise Technologies. № 4/5 (76), pp. 40-46. ISSN 1729-3774,

Kahanov V., Hornikovska I., Pozniak O. (2018). Improving the operational properties of road surface dressing. Collection of abstracts of the International Conference "Structuring, strength and destruction of composite building materials and structures", pp. 20-22, Odesa.

Transport facilities. Highways. Part I. Design. Part II. Construction. DBN B.2.3-4:2015 State Building Codes of Ukraine. (2015). Kyiv: Ministry of Regional Development of Ukraine. Roads. Non-rigid road dressing. GBN B.2.3-37641918-559:2019. State Building Codes of Ukraine. (2019). Kyiv: Ministry of Infrastructure of Ukraine