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

An ultra-high toughness and anti-abrasion technology, applied in the field of building materials, can solve the problems of large slump loss, high amount of cementitious materials, strong destructive force, etc., to reduce self-shrinkage and drying shrinkage, improve compactness and Strength, the effect of improving impact toughness

Active Publication Date: 2019-11-15
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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

Method used

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

Examples

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preparation example Construction

[0042] The preparation method of the shrinkage-reducing viscosity-reducing type water reducer described in Examples 1-5 comprises the following steps:

[0043] 1) Add maleic anhydride into the reaction vessel, heat up to 55°C to melt it completely, then add diethylene glycol monobutyl ether and p-toluenesulfonic acid, heat up to 135°C, perform constant temperature esterification for 4.5 hours, and cool Purify by suction filtration afterward, obtain the diethylene glycol monobutyl ether maleic anhydride monoester monomer with shrinkage function, wherein the mass ratio of maleic anhydride, diethylene glycol monobutyl ether and p-toluenesulfonic acid is 1:0.55:0.06;

[0044] 2) Add the diethylene glycol monobutyl ether maleic anhydride monoester monomer, methacrylic acid and sodium methacrylate sulfonate prepared in step 1) into a reaction vessel filled with distilled water, heat up to 95°C, drop Add allyl polyethylene glycol and ammonium persulfate aqueous solution, react at a c...

Embodiment 1～3

[0053] A low-shrinkage anti-abrasion ultra-high toughness concrete, the preparation method of which comprises the following steps:

[0054] 1) take each raw material according to the proportioning described in Table 1;

[0055] 2) Put the weighed high-titanium heavy slag sand into water and soak for 1 day until saturated, then drain until the saturated surface is dry to obtain pre-wetted high-titanium heavy slag sand; machine-made sand, pre-wetted high-titanium heavy slag sand, cement , silica fume and fly ash microbeads were added to the concrete mixer for pre-mixing for 3 minutes, poured in water and viscosity-reducing superplasticizer and stirred for 4 minutes, then added composite expansion agent and stirred for 2 minutes, then evenly added mixed fibers and continued to stir for 3 minutes; Oxygen resin was stirred for 3 minutes, and finally molded, vibrated, and formed, and the surface was covered with an impermeable film. After 1 day, the mold was removed for standard mai...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04C04B111/34C04B111/20
CPCC04B28/04C04B2111/343C04B2111/2038C04B2201/50C04B18/082C04B18/146C04B14/06C04B18/141C04B14/48C04B16/0641C04B2103/302C04B24/281C04B22/142C04B22/064C04B22/143C04B22/066
Inventor 丁庆军耿雪飞张恒邓超金宏程周鹏
Owner WUHAN UNIV OF TECH
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