Features of obtaining a thermal insulation layer from monolithic non-autoclaved structural and thermal insulation fibropen concrete

Abstract

The possibility of obtaining structural and thermal insulation foam concrete of non-autoclave hardening with improved construction and technical characteristics for the device of a thermal insulation layer in the construction of road pavement due to three-dimensional dispersed reinforcement with polypropylene fiber is theoretically justified and experimentally confirmed. Based on the results of studies of the influence of technological factors on the properties of foam concrete, the optimal content (up to 0.25% of the cement weight) and the length (12 mm) of reinforcing polypropylene fibers were established, which allows you to obtain high strength indicators of dispersed-reinforced cement stone for bending (an increase of 12-20%) and compression (an increase of 6-12%) compared to non-reinforced cement stone of non-autoclaved foam concrete. The analysis of the process of structure formation of dispersed reinforced foam concrete from the standpoint of a systematic approach based on multifactorial polynomial models of the influence of the ratio of filler and binder, as well as the number of dispersed reinforcing fibers, which is determined by the optimal distribution conditions of solid and gas phases, as well as reinforcement of adjacent interstitial partitions of foam concrete, linking them into one associate, which ensures the joint work of the material under various external influences. A method has been developed to increase the durability of the road surface and eliminate the influence of the frost heaving effect on the quality of the road surface by introducing the necessary amount of an effective thermal insulation layer into the construction of the road surface. The analysis of the regularity of the heat transfer process in the soil mass of the roadbed and multilayer road clothing is carried out. Based on the conducted analysis the values of the necessary resistance to heat transfer of road clothing for the natural-climatic regions of the country are established and a method for calculating the value of the thermal insulation (frost-proof) layer of road clothing is proposed. A method has been developed for calculating the value of the thermal insulation layer using monolithic fibropen concrete and a nomogram to determine the required value of the thermal insulation layer made of monolithic non-autoclaved structural and thermal insulation fibropen concrete of classes D600- D1000.