Waterborne polyurethane polymer modified concrete for bridge deck slab and preparation method
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A water-based polyurethane and polymer technology, which is applied in the field of building materials, can solve problems such as bridge deck corrosion and damage, and achieve the effects of reducing the structural weight, improving compression resistance, and increasing the structural span
Inactive Publication Date: 2015-07-22
HARBIN ENG UNIV
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Problems solved by technology
[0004] The purpose of the present invention is to provide a bridge deck water-based polyurethane polymer modified concrete that can effectively solve the probl
Method used
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Embodiment 1
[0022] Example 1: 52.5 ordinary Portland cement, coarse aggregate with a maximum particle size of no more than 20mm, medium sand, fly ash, silica fume, concrete superplasticizer with β-naphthalenesulfonic acid formaldehyde condensate as the main component , water-based polyurethane with a solid content of 35% and water, these raw materials are as follows according to weight ratio: 16.8%, 29.8%, 39.8%, 2.7%, 1.5%, 0.2%, 7.2%, 2%.
[0023] At room temperature, put the dry aggregate and filler into the forced mixer and stir for 2 minutes. Then add the aqueous polyurethane emulsion and stir for another 3 minutes. Then water was added and stirred for 2 min. Finally, add naphthalene-based high-efficiency water reducer. Finally, add naphthalene-based high-efficiency water reducer and stir for 2 minutes to make the mixture reach a uniform state, and then construction can be carried out.
Embodiment 2
[0024] Example 2: 52.5 ordinary Portland cement, coarse aggregate with a maximum particle size of no more than 20mm, medium sand, fly ash, silica fume, concrete superplasticizer with β-naphthalenesulfonic acid formaldehyde condensate as the main component , the water-based polyurethane with a solid content of 35% and the raw materials of water are as follows according to the weight ratio: 18.9%, 31%, 36%, 3%, 1.8%, 0.25%, 5.4%, 3.65%.
[0025] At room temperature, put the dry aggregate and filler into the forced mixer and stir for 2 minutes. Then add the aqueous polyurethane emulsion and stir for another 3 minutes. Then water was added and stirred for 2 min. Finally, add naphthalene-based high-efficiency water reducer. Finally, add naphthalene-based high-efficiency water reducer and stir for 2 minutes to make the mixture reach a uniform state, and then construction can be carried out.
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Abstract
The invention relates to waterborne polyurethane polymer modified concrete for a bridge deck slab and a preparation method. The waterborne polyurethane polymer modified concrete comprises the following components: ordinary silicate cement, pebbles, medium sand, coal ash, silicon ash, a naphthalene water reducer, waterborne polyurethane emulsion and water. The preparation method comprises the following steps: putting the dried pebbles, the ordinary silicate cement, the medium sand, the coal ash and the silicon ash into a stirring machine at a normal temperature, and stirring; adding the waterborne polyurethane emulsion, and stirring; adding the water, and stirring; finally, adding the naphthalene water reducer, and stirring. The invention provides the waterborne polyurethane polymer modified concrete for problems that an ordinary concrete bridge deck slab is likely to suffer from corrosion damage and low in strength. The polymer modified concrete can effectively solve the problem of high possibility of causing corrosion damage of the bridge deck slab in a complicated environment and greatly reduce the repair expense in an operation process. The polymer modified concrete can be applied to a bridge surface structure which is relatively high in durability requirement or is relatively difficult to repair and relatively large in span.
Description
technical field [0001] The invention relates to a building material, in particular to a bridge deck waterborne polyurethane polymer modified concrete. The invention also relates to a preparation method of bridge deck waterborne polyurethane polymer modified concrete Background technique [0002] The bridge deck is an important part of the bridge structure, and the durability of the bridge deck directly affects the durability of the bridge structure. At the same time, with the continuous increase of the span of the bridge, it is very necessary to reduce the self-weight of the structure. Therefore, the choice of bridge deck material is very important. Ordinary concrete bridge decks are often damaged by chloride ion attack, freezing and carbonization. Although these damages are initially superficial, over time they can extend to the inner structural material, causing reinforcement corrosion and threatening the life of the bridge. At the same time, the strength of ordinary c...
Claims
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Application Information
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