A kind of ultra-high performance concrete in the transition zone of expansion joints and its preparation method

Abstract

The invention discloses an ultra-high performance concrete for an expansion joint transition area. The ultra-high performance concrete is prepared from the following main raw materials: cement, fly ash microbeads, silica fume, high-titanium heavy slag sand, organic-inorganic hybrid fiber, a waterborne epoxy emulsion, a water reducing agent and water. According to the invention, the high-titanium heavy slag sand is used as aggregate, the internal curing and pin effects of the aggregate are utilized to improve the volume stability, anti-permeability and cracking resistance, and mechanical properties of the concrete; an organic-inorganic fiber composite toughening technology is adopted to enhance the bending toughness and impact resistance; the water reducing agent and fly ash microbeads areadded to improve the working performance and compactness; and the obtained ultra-high performance concrete has the advantages of high flow state, low shrinkage, high toughness, high adhesion, high impact performance, fatigue resistance and the like, can fundamentally solve the problems of repeated repairing, repeated damage and the like of concrete in expansion joint transition areas, and has important practical application value.

Description

technical field [0001] The invention belongs to the field of building materials, and in particular relates to an ultra-high-performance concrete in an expansion joint transition zone and a preparation method thereof. Background technique [0002] At present, most of the bridge pavements in China use asphalt mixture for bridge deck paving, and cement concrete is used to fill bridge expansion joints. Therefore, the quality and flatness of the concrete in the transition zone of expansion joints directly affect the life of the bridge and the driving comfort. On the one hand, because it directly bears the repeated rolling impact of the wheel, the concrete in the transition zone has high rigidity and poor deformation capacity, and cannot effectively absorb and transmit the impact energy of the expansion body; on the other hand, it has been exposed to natural conditions for a long time, and some northern regions use it De-icing salt is anti-slip and the service environment is rela...

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