Modified ardealite stabilized macadam as well as preparation method and application thereof

Abstract

The invention relates to the technical field of road building materials, in particular to modified ardealite stabilized macadam and a preparation method and application thereof. The modified ardealite is adopted as a hydraulic material and fully filled among aggregates, all the components are bonded, the early strength of a gravel layer is enhanced, meanwhile, the red mud is matched to regulate and control the micro-expansion effect formed in the hydration process, the resistance of the gravel layer to early shrinkage cracking is improved, chemical fibers are added, the toughness of the chemical fibers is utilized, expansion stress is limited, the anti-fatigue performance of a road base is improved, and cracking caused by excessive expansion in the later strength development process of the gravel layer is avoided. The modified ardealite stabilized macadam provided by the invention can effectively solve the problem of shrinkage cracking of the current road base material, and the service life of the road base is prolonged.

Description

technical field [0001] The invention relates to the technical field of road building materials, in particular to a modified phosphogypsum stabilized crushed stone and its preparation method and application. Background technique [0002] From top to bottom, the road structure is generally divided into asphalt concrete layer, base layer, gravel cushion, compacted soil foundation, etc. Among them, the cement-stabilized graded gravel layer is usually used as the road base, referred to as the water-stabilized layer. Specifically, the graded crushed stone is used as the aggregate, and a certain amount of cementitious material and sufficient mortar volume are used to fill the voids of the aggregate. Pave and compact according to the principle of embedded extrusion. The initial strength of the water-stable layer is high, and the strength increases with age, so it has high service strength, and has good impermeability and frost resistance. The water-stable layer is not muddy when i...

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Problems solved by technology

However, due to the fact that the materials that make up the water-stabilized layer are prone to dry shrinkage cracks and temperature shrinkage cracks when the humidity and temperature change, and as the traffic load increases, it is easy to produce load cracks, resulting in the formation of reflection cracks in the asphalt surface, which affects the road surface. Performance and life

[0003] When the existing stabilizing materials are applied to the pavement base, the higher the strength, the greater the shrinkage, and the more prone to shrinkage cracking, and most of the stabilizing materials reduce the shrinkage by reducing the strength, such as JTG / T F20-2015 The "Technical Rules for Road Pavement Base Construction" stipulates that the standard value of the 7d age unconfined compressive strength of medium and light traffic pavement base cement stabilized materials is 3.0-5.0mPa, and the 7d age unconfined compressive strength of heavy traffic pavement base cement stabilized materials is no The standard value of confined compressive strength is 4.0-6.0mPa, and the standard value of 7d-age unconfined compressive strength of extremely heavy and extra-heavy traffic pavement base cement stabilized materials is 5.0-7.0mPa. The higher the strength, the better the fatigue resistance and the longer the service life, but the higher the strength, the worse the shrinkage, the easier it is for the road base to crack and reflect the cracks to the road surface, which will lead to a reduction in the service life. The design service life of conventional road stabilization materials generally does not exceed 15 years

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