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High-temperature-resistant sleeve grouting material for steel bar connection and preparation method thereof

A technology of sleeve grouting and high temperature resistance, which is applied in the field of concrete materials, can solve the problem that the connection of steel bars is not as good as cast-in-place, and achieve the effects of compensating for strength loss, high mechanical properties, and reducing the risk of disintegration

Inactive Publication Date: 2020-12-22
福建鸿生高科环保科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Yet, can the steel bar sleeve connection of existing steel bar connection be equivalent to cast-in-place? Tests have proved that it can be achieved under normal temperature and low temperature service environment, but under high temperature environment, due to the existence of free water, Portland cement hydrate will expand rapidly and burst due to steam, and the grouting material will bite and grip the steel bar. The connection is not as good as the cast-in-place process

Method used

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  • High-temperature-resistant sleeve grouting material for steel bar connection and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] This embodiment discloses a high-temperature-resistant sleeve grouting material for steel bar connection. First, 25% of P.O52.5 Portland cement, 4% of high-alumina cement, 2.8% of S95 mineral powder, and 1.5% of silica fume in component A are disclosed. , F class I fly ash 9%, quartz sand mill fine powder 7%, plastic expansion agent 0.6%, magnesia fine aggregate with fineness modulus 2.7 16.68%, blast furnace steel slag fine aggregate after high temperature autoclaving treatment 16%, 1.8% polyoxymethylene fiber with a diameter of 0.2mm and a length of 4.0mm, 2.5% ceramic fiber, and 1.5% dihydrate gypsum were put into the mixer and mixed for 3 minutes, then added 8% water in component B, 0.02% graphene oxide, polycarboxylate 2% acid superplasticizer mother liquor, 1.5% polycarboxylic acid slump retaining mother liquor, 0.05% air-entraining agent, 0.05% defoamer and continue to stir and mix for 3 minutes to obtain sleeve grouting material. The sleeve grouting material has...

Embodiment 2

[0028] This embodiment discloses a high-temperature-resistant sleeve grouting material for steel bar connection. First, in component A, 26% of P.O52.5 Portland cement, 5% of high-alumina cement, 2.8% of S95 mineral powder, and 1.5% of silica fume , F class I fly ash 5%, quartz sand mill fine powder 8%, plastic expansion agent 0.6%, magnesia fine aggregate with fineness modulus 2.7 14.5%, blast furnace steel slag fine aggregate after high temperature autoclaving treatment 19.18%, 1.8% polyoxymethylene fiber with a diameter of 0.2mm and a length of 4.0mm, ceramic fiber 2.5%, and dihydrate gypsum 1.5% were put into a mixer and mixed for 3 minutes, then added to component B with 8% water, graphene oxide 0.02%, polycarboxylate 2% acid superplasticizer mother liquor, 1.5% polycarboxylic acid slump retaining mother liquor, 0.05% air-entraining agent, 0.05% defoamer and continue to stir and mix for 3 minutes to obtain sleeve grouting material. The sleeve grouting material has an initi...

Embodiment 3

[0030]This embodiment discloses a high-temperature-resistant sleeve grouting material for steel bar connection. First, in component A, 22% of P.O52.5 Portland cement, 3.18% of high-alumina cement, 1.8% of S95 mineral powder, and 1% of silica fume , Class F, Class I fly ash 9.5%, quartz sand mill fine powder 9%, plastic expansion agent 0.6%, magnesia fine aggregate with fineness modulus 2.7 17.5%, blast furnace steel slag fine aggregate after high-temperature autoclaved treatment 16%, 1.8% polyoxymethylene fiber with a diameter of 0.2mm and a length of 4.0mm, 2.5% ceramic fiber, and 1.5% dihydrate gypsum were put into the mixer and mixed for 3 minutes, then added 10% water in component B, 0.01% graphene oxide, polycarboxylate 2% acid superplasticizer mother liquor, 1.5% polycarboxylic acid slump retaining mother liquor, 0.05% air-entraining agent, 0.06% defoamer and continue to stir and mix for 3 minutes to obtain sleeve grouting material. The sleeve grouting material has an in...

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Abstract

The invention particularly relates to a high-temperature-resistant sleeve grouting material for steel bar connection, which comprises a component A and a component B. The component A comprises 20-30%of Portland cement, 3-5% of high-alumina cement, 2-3% of S95 mineral powder, 1-2% of silica fume, 5-10% of fly ash, 5-10% of quartz sand fine powder, 0.5-1% of expanding agent, 1-2% of copolyoxymethylene fiber, 20-30% of magnesite fine aggregate with a fineness modulus of 2.7, and 10-20% of blast furnace steel slag fine aggregate subjected to high-temperature autoclaving treatment, and the like. The component B comprises the following components in percentage by weight: 4-10% of water, 0.01-0.02% of graphene oxide, 2-3% of polycarboxylic acid water reducing agent mother liquor, 1-2% of polycarboxylic acid slump retaining mother liquor, 0.03-0.1% of air entraining agent and 0.03-0.1% of defoaming agent. The sleeve grouting material forms a steam dissipation channel in the grouting sleeve and maintains high mechanical properties, so that structural burst of a steel bar connecting joint is avoided, and secondary disasters can be avoided.

Description

technical field [0001] The invention belongs to the technical field of concrete materials, and in particular relates to a high-temperature-resistant sleeve grouting material for steel bar connection and a preparation method thereof. Background technique [0002] The industrialization of construction has become an irreversible wave. In this context, the construction assembly process is gradually replacing the cast-in-place process. The most important joint connection method in prefabricated buildings, that is, the steel bar sleeve connection has become one of the most important steel bar connection methods. The steel bar sleeve connection material and the sleeve grout for the steel bar connection are the key materials to ensure that the steel bar assembly connection is equivalent to the cast-in-place connection. . Yet, can the steel bar sleeve connection of existing steel bar connection be equivalent to cast-in-place? Tests have proved that it can be achieved under normal t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/06C04B111/70
CPCC04B28/06C04B2111/70C04B22/00C04B18/141C04B18/08C04B14/06C04B14/304C04B18/142C04B16/0675C04B14/46C04B22/143C04B2103/0058C04B14/024C04B2103/302C04B2103/50C04B2103/304C04B2103/308
Inventor 陈培标刘刚张大财霍金朱卫东金旺洲刘万平
Owner 福建鸿生高科环保科技有限公司
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