Method for improving dry shrinkage resistance of cement stabilized macadam base material

Abstract

The invention discloses a method for improving the dry shrinkage resistance of a cement stabilized macadam base material. The method includes the following steps: according to JTG D50-2006 'Specifications for Design of Highway Asphalt Pavement' and JTG E42-2005 'Test Methods of Aggregate for Highway Engineering', designing a cement stabilized macadam base material mixing proportion according to gradation of various grades of aggregates; then according to JTG E51-2009 'Test Methods of Materials Stabilized with Inorganic Binders for Highway Engineering', carrying out compaction test, and determining the optimal water content of the cement stabilized macadam base material at specific cement dosage; and blending magnetized water with the optimal water content, macadam and cement to obtain thecement stabilized macadam base material. The magnetized water is prepared according to the following way: using three GMX800 magnetizers, according to the water flow direction indicated by the magnetizers, successively placing on the outer wall of a rubber pipe with the pipe diameter of 20 mm, making the intervals between the magnetizers be 25 mm, and controlling ordinary water to pass through themagnetizers with the flow rate of 225 mL / s, to obtain the magnetized water.

Description

technical field [0001] The invention belongs to the technical field of cement materials, and in particular relates to a method for improving the drying shrinkage resistance of cement-stabilized gravel base material. Background technique [0002] Cement-stabilized macadam base materials not only have high strength and high rigidity, but also have good stability and plate integrity, convenient mechanized construction, and low engineering cost. They are widely used in road construction. However, the cement-stabilized crushed stone base material also has significant defects, that is, it is easy to cause drying shrinkage with the change of the humidity of the mixture, and cracks will occur when the tensile strength of the mixture is not enough to resist its shrinkage deformation. When the asphalt pavement is thin, cracks spread to the asphalt pavement to form reflective cracks, destroying the integrity and continuity of the pavement structure, greatly reducing the service life of...

AI Technical Summary

Problems solved by technology

However, the cement-stabilized gravel base material also has significant defects, that is, it is easy to cause drying shrinkage with the change of the humidity of the mixture, and cracks will occur when the tensile strength of the mixture is not enough to resist its shrinkage deformation.

When the asphalt pavement is thin, cracks spread to the asphalt pavement to form reflection cracks, destroying the integrity and continuity of the pavement structure, greatly reducing the service life of the pavement structure, and affecting road safety

[0003] Researchers at home and abroad have carried out extensive research on the drying shrinkage characteristics of cement-stabilized macadam base materials. In this regard, few researchers have studied the drying shrinkage characteristics of cement stabilized macadam base materials from the perspective of mixing water for cement stabilized macadam base materials.

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