Seawater corrosion-resistant concrete member and preparation method thereof

A cement concrete and concrete technology, applied in the field of concrete components, can solve problems such as insufficient durability, poor seawater corrosion resistance, corrosion, etc., and achieve improved matrix compactness and matrix strength, strong Cl- corrosion resistance, and improved durability Effect

Active Publication Date: 2022-02-08
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The second purpose of the present invention is to provide FRP bar-ettringite cement concrete member, to solve the existing marine concrete poor seawater corrosion resistance, insufficient durability, and the high alkali environment of the existing Portland cement concrete corroding the FRP bar And other issues

Method used

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  • Seawater corrosion-resistant concrete member and preparation method thereof
  • Seawater corrosion-resistant concrete member and preparation method thereof
  • Seawater corrosion-resistant concrete member and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-9

[0041] Embodiment 1-9. Concrete based on ettringite cement and performance test thereof

[0042] The ettringite cement concretes of Examples 1-9 were prepared according to the mixing ratio listed in Table 1 below. The slag sulphoaluminate cement, calculated by weight percentage, is composed of 60%-90% of granulated blast furnace slag, 10-30% of anhydrite, and 5-10% of high belite sulphoaluminate cement clinker after mixing and grinding made.

[0043] The mixing ratio of table 1 embodiment 1~9 ettringite concrete

[0044]

[0045] Among them, the slag sulphoaluminate cement-based ettringite concrete was prepared with different water-binder ratios in Examples 1 to 3; in Examples 4 to 7, part of the sea sand was used to replace the river sand, and the weight ratios of the sea sand to the river sand were respectively : 1:0, 0.25:0.75, 0.5:0.5, and 0.75:0.25.

[0046] Concrete based on ordinary 42.5 Portland cement of Comparative Examples 1-3 was prepared according to the mix...

Embodiment 10～19

[0053] Examples 10-19. FRP bar-ettringite cement concrete member and its performance test

[0054] Obtain the FRP reinforcement-ettringite concrete member of embodiment 10~19 by pouring according to the raw material listed in following table 4 and mix ratio. The specific steps of component making are as follows:

[0055] 1) A 100mm cubic steel mold and wooden formwork are used, and round holes are symmetrically opened on both sides of the formwork for the penetration of bars of different diameters;

[0056] 2) In order to prevent the concrete specimen from cracking during the test, the spiral stirrup (reinforcement bar) was first added to the specimen template, and placed axially along the circular hole, and then the FRP listed in Table 4 with a length of 700mm and a diameter of 8mm The reinforcement penetrates through the symmetrical circular hole of the formwork described in 1) so that a section of its length is inside the spiral stirrup;

[0057] 3) Mix and prepare concre...

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Abstract

The invention provides a concrete member resistant to seawater and high-salt environment erosion, which is poured from raw materials including FRP bars and ettringite cement concrete. The described ettringite cement concrete, by weight percentage, its raw material components are composed of ettringite cement 10%~20%, fine aggregate 25%~40%, coarse aggregate 40%~55%, water 4% ~10% and 0.05%~0.2% of admixture; the described ettringite cement is slag sulphoaluminate cement or high belite sulphoaluminate cement; the described fine aggregate is river sand or sea sand Any one or a mixture of two of them; the raw material components are preferably composed of ettringite cement 14%~19%, fine aggregate 27%~36%, coarse aggregate 43%~52%, water 6~ 7.5% and 0.1% to 0.2% admixture. Since the ettringite cement concrete is not easy to be corroded by sulfates, and the hardened structure has excellent resistance to sulfuric acid corrosion, the concrete member of the present invention can solve the problems of poor seawater corrosion resistance and insufficient durability of existing marine concrete.

Description

technical field [0001] The present invention relates to a kind of concrete member, be specifically related to a kind of FPR bar-ettringite cement concrete member, its preparation method and the application in marine construction engineering. Background technique [0002] Marine concrete materials are facing serious durability problems. At present, the cementitious materials used in marine engineering usually use Portland cement system, and the tensile stress of the structure is borne by the configured steel bars. Due to the large amount of SO contained in seawater 4 2- and Cl - , SO 4 2- Will react with Ca(OH) in concrete 2 And the C-S-H reaction causes the performance of concrete to deteriorate; Cl - If it enters the interior of the concrete, it will corrode the steel bars and seriously affect the durability of the material building structure, and the structure of Portland cement will become alkaline after hydration, which will have a certain impact on the marine envi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/08C04B28/06C04B111/24
CPCC04B28/08C04B28/065C04B2111/24C04B2201/50C04B14/068C04B14/00C04B2103/0068C04B22/0026C04B22/002
Inventor 周健李辉徐名凤
Owner HEBEI UNIV OF TECH
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