Concrete with low shrinkage, good erosion and abrasion resistance and ultrahigh toughness, and preparation method thereof

Abstract

The invention discloses a concrete with low shrinkage, good erosion and abrasion resistance and ultrahigh toughness. The concrete is prepared mainly from cement, fly ash microbeads, silica fume, machine-made sand, high-titanium heavy slag sands, hybrid fibers, a waterborne epoxy resin, a composite expansion agent, a shrinkage-reducing and viscosity-reducing water reducer and water. The concrete with low shrinkage, good erosion and abrasion resistance and ultrahigh toughness has the advantages of high mechanical properties, good impact toughness, good abrasion resistance, good interfacial bonding strength of new concrete and old concrete, combination of good working performances and the volume stability, and practical application values.

Description

technical field [0001] The invention belongs to the field of building materials, and in particular relates to a low-shrinkage, abrasion-resistant, ultra-high toughness concrete and a preparation method thereof. Background technique [0002] The terrain in the mountainous areas of western my country is complex, with many deep ditches and canyons, and a large number of bridges are built. However, natural disasters such as mudslides and floods frequently occur in mountainous areas, and solid debris such as sediment and stones flow quickly, have a large flow, and are destructive. Under the action of mountain torrents, mud-rock flow abrasion and dynamic load coupling, the buildings will be in service for one to two years, and the concrete of the reinforced protective layer will generally appear abrasion and cracks, resulting in huge safety hazards and high maintenance costs. The construction, repair and reinforcement materials of conventional hydraulic structures have low strength...

AI Technical Summary

Problems solved by technology

[0002] The terrain in the mountainous areas of western my country is complex, with many deep ditches and canyons, and a large number of bridges are built. However, natural disasters such as mudslides and floods frequently occur in mountainous areas, and solid debris such as sediment and stones flow quickly, have a large flow, and are destructive. Under the action of mountain torrents, debris flow, and dynamic load coupling, the buildings will be in service for one to two years, and the concrete of the reinforced protective layer will generally appear to be abraded and cracked, causing huge safety hazards and high maintenance costs.

Conventional hydraulic structure construction and repair and reinforcement materials have low strength, poor impact toughness and abrasion resistance, and cannot meet the actual needs of engineering in the complex environment of western mountainous areas

Ultra-high performance concrete has excellent mechanical properties and impact / abrasion resistance. It is an ideal construction and repair reinforcement material for hydraulic structures such as bridge piers. However, due to the high amount of cementitious materials used in the preparation process of ultra-high performance concrete, early shrinkage Large, which seriously affects the volume stability of the concrete structure; the water-binder ratio is low, and the amount of ultrafine particles is high, so it shows the disadvantages of high viscosity and large slump loss, which is not conducive to pouring construction; and the interface between new and old concrete is bonded The ability is poor, and many deficiencies limit its application in the construction and repair and reinforcement of bridge piers and other hydraulic structures

Images