Services Products Completed objects news Company Normative documents +7 (8452) 29-44-49 Contact information Products / Asphalt concrete mixes Fine-grained asphalt concrete: type AM I; BM I; BM II; VM I; VM II; GM II; Coarse asphalt concrete M I; M II; SCHMA; Black rubble Asphalt concrete is a common building material. It is used in the construction of road and airfield pavements, operated flat roofs, as well as in hydraulic engineering. It is obtained as a result of the hardening of the compacted asphalt concrete mixture. The history of hot mix design begins at the end of the 19th century, when different selection methods were developed independently in several countries. Each method included a set of measures for compacting a hot mix, assessing the porosity of asphalt concrete and testing asphalt concrete to determine its performance. With all the variety of selection methods, the principle of designing a mixture is fundamental, ensuring that the requirements for the quality of asphalt concrete adopted at the beginning of the 20th century are met, the main purpose of which is - optimal operational properties of the road surface and a long service life. There are two approaches to designing asphalt mix formulations. The first is the selection of a mixture with continuous granulometry of stone material. This option guarantees high mechanical properties of the coating due to the wedging of crushed stone of larger fractions by small fractions. The coating, made of a mixture with continuous granolumetry of the mineral part, has a high roughness and shear stability. The properties of the mixture do not change as a result of deviations in the dosage of mineral powder and bitumen, it is easily distributed, formed and compacted during the coating process. For mixtures of this type, durable stone materials with more than half of the grain surface are needed. The shape of the grain size distribution curve (sieving curve) of a mixture of mineral materials approaches a cubic parabola. An important condition is the use of bitumen, © 2013—2016 LLC "Sardorstroy" +7 (8452) 29-44-49 Website development - Nopreset