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High-density frozen-penetration-resistant marine concrete and preparation method thereof

A marine concrete and dense technology, which is applied in the field of high-density anti-freeze and seepage marine concrete and its preparation, can solve the problems of material deterioration, poor service performance, and peeling of the protective layer, so as to improve the anti-freeze seepage effect and meet the durability Requirements, the effect of improving the compactness of the system

Inactive Publication Date: 2020-03-13
中建西部建设新疆有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The coupling effect of these various factors leads to problems such as peeling of the protective layer and corrosion of steel bars in the concrete structure during the design service period, premature material deterioration of the structure, and eventually loss of the service performance of the structure, which has become an important factor affecting the service life of the concrete structure. question
[0003] The current marine concrete mainly adds a large amount of mineral admixtures to improve the durability of the concrete, but according to the survey, most marine projects still have the problem of poor service performance. penetration effect

Method used

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  • High-density frozen-penetration-resistant marine concrete and preparation method thereof
  • High-density frozen-penetration-resistant marine concrete and preparation method thereof
  • High-density frozen-penetration-resistant marine concrete and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A high-density anti-freezing and seepage marine concrete is prepared by the following method:

[0021] (1) Preparation of modified metakaolin: Using the excellent ball effect of silica fume to make up for the disadvantage that calcined metakaolin will reduce the workability of cement-based materials, the mass ratio of silica fume and calcined metakaolin is controlled at 4:1, and the silicon The ash and the calcined metakaolin are mixed and then placed in a ball mill for blending and ball milling. The ball-to-material ratio of the ball-milling blend is 100:6-100:8, and the ball-milling speed is 60r / min-80r / min to prepare the modified metakaolin;

[0022] (2) Determine the components of the gelling system:

[0023] a. Determine the components of mineral admixtures, select modified metakaolin and S95 mineral powder as mineral admixtures, and use the minimum water demand method to determine the ratio of the two. The specific test process is as follows:

[0024] Using a pur...

Embodiment 2

[0033] A high-density anti-freezing and seepage marine concrete is prepared by the following method:

[0034] (1) The distribution ratio of each group is shown in Table 3 below;

[0035] Table 3 Optimized mix ratio (kg / m 3 )

[0036]

[0037] The raw materials for preparing concrete were sampled according to the proportions shown in Table 3, and were produced with reference to the standard of GB / T 50081 "Standard for Testing Method of Mechanical Properties of Ordinary Concrete". Add coarse aggregate, fine aggregate and cementitious material (cement + mineral admixture) to the horizontal shaft forced concrete mixer in sequence, pre-mix for 1 minute, and after mixing evenly, start the formal mixing, and add them separately during the mixing process. Water and pre-prepared graphene oxide / polycarboxylate superplasticizer (graphene oxide / polycarboxylate superplasticizer is obtained after blending graphene oxide and admixtures for 60min ultrasonically), and the stirring time is...

Embodiment 3

[0039] A high-density anti-freezing and seepage marine concrete is prepared by the following method:

[0040] (1) The distribution ratio of each group is shown in Table 4 below;

[0041] Table 4 Optimized mix ratio (kg / m 3 )

[0042]

[0043] The raw materials for preparing concrete were sampled according to the proportions shown in Table 4, and were produced with reference to the standard of GB / T 50081 "Standard for Mechanical Properties of Ordinary Concrete". Add coarse aggregate, fine aggregate and cementitious material (cement + mineral admixture) to the horizontal shaft forced concrete mixer in sequence, pre-mix for 1 minute, and after mixing evenly, start the formal mixing, and add them separately during the mixing process. Water and pre-prepared graphene oxide / polycarboxylate superplasticizer (graphene oxide / polycarboxylate superplasticizer is obtained after blending graphene oxide and admixtures for 60min ultrasonically), and the stirring time is controlled at 3mi...

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Abstract

The invention belongs to the technical field of marine engineering high performance, and particularly relates to a high-density frozen-penetration-resistant marine concrete and a preparation method thereof. The high-density frozen-penetration-resistant marine concrete is composed of cement, a mineral admixture, sand, pebble, an additive, graphene oxide and water, and specifically, 270-280kg / m<3> of cement, 180-190kg / m<3> of the mineral admixture, 685-711kg / m<3> of sand, 1074-1119kg / m<3> of pebble, 9-9.4kg / m<3> of the additive, 0.135-0.141kg / m<3> of graphene oxide and 157-164 kg / m<3> of water.According to the invention, the binding capacity of calcined metakaolin and chloride ions is utilized; the influence of calcined metakaolin on the workability of a cement-based material is reduced through silica fume, so that a gelling system achieves the tightest stacking effect, meanwhile, the density of the gelling system is further improved by utilizing graphene oxide, and then the workabilityand the anti-freezing effect of concrete are improved by regulating and controlling the additive and the sand rate.

Description

technical field [0001] The invention belongs to the technical field of high-performance marine engineering, and in particular relates to a high-density, anti-freezing and seepage-resistant marine engineering concrete and a preparation method thereof. Background technique [0002] The service environment of marine concrete structures is harsh, not only subject to marine environmental factors such as temperature, humidity changes, harmful ion erosion, but also to the erosion and wear of sea sand and sea ice. The coupling of these various factors leads to problems such as peeling of the protective layer and corrosion of steel bars during the design service period of the concrete structure, premature material deterioration of the structure, and eventually loss of the service performance of the structure, which has become an important influence on the service life of the concrete structure. question. [0003] The current marine concrete mainly adds a large amount of mineral admi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/00C04B111/24
CPCC04B28/00C04B2111/24C04B14/106C04B18/141C04B14/06C04B14/02C04B2103/302C04B22/002C04B14/024
Inventor 孟书灵陈旭王军张平李凯岳彩虹
Owner 中建西部建设新疆有限公司
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