High-performance marine concrete with high water absorption and coarse aggregate and construction method of high-performance marine concrete

A technology of marine concrete and water absorption, which is applied in the processing of building materials, construction, building construction, etc., and can solve the problems of high cementitious material consumption, economic waste, and poor construction performance

Active Publication Date: 2018-06-01
CHINA ROAD & BRIDGE +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the mix ratio design is carried out according to the ordinary concrete mix ratio design rules, the concrete slump will be too small due to the water absorption of the coarse aggregate, and the construction performance will be deteriorated; if the design is carried out according to the light aggregate concrete with high water absorption rate, it will inevitably It will cause the amount of cementitious material to be too high and the surplus coefficient of the mix ratio to be too high, resulting in economic waste

Method used

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  • High-performance marine concrete with high water absorption and coarse aggregate and construction method of high-performance marine concrete
  • High-performance marine concrete with high water absorption and coarse aggregate and construction method of high-performance marine concrete
  • High-performance marine concrete with high water absorption and coarse aggregate and construction method of high-performance marine concrete

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Experimental program
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Effect test

Embodiment 1

[0100] Embodiment 1, preparation of large water absorption coarse aggregate high performance marine concrete

[0101] 1 raw material

[0102] Cement and fly ash: CEM II / A-L42.5N cement produced by the rotary kiln of Matola CM Cement Plant in Mozambique and Class I fly ash produced by ULULA in South Africa were used in the test. The quality test results are listed in Table 1 and Table 2, respectively.

[0103] Table 1 Analysis of chemical composition and physical and mechanical properties of cement

[0104]

[0105] Table 2 Physical and mechanical properties of fly ash

[0106]

[0107] Aggregate: The fine aggregate is the natural river sand of the Moamba River in Mozambique. The basic properties and screening results of the sand are listed in Table 3 and Table 4, respectively.

[0108] Table 3 Basic properties of river sand

[0109]

[0110] Table 4 Screening results of river sand

[0111]

[0112] Coarse aggregates are produced at the Namaacha quarry and Hiper...

Embodiment 2

[0153] Embodiment 2. Construction method of high-performance concrete with large water absorption coarse aggregate

[0154] 1.1 Construction process

[0155] The construction process of high water absorption macadam high performance concrete see image 3 .

[0156] 1.2 Operation points

[0157] At present, the preparation of fair-faced concrete admixtures at home and abroad usually adopts the scheme of "elimination first and then introduction", and polycarboxylate superplasticizers, defoamers and air-entraining agents are often used for preparation, but the water-reducing rate of ordinary polycarboxylate superplasticizers High air content is also high. In order to meet the requirements of reducing the low air content of concrete, more defoamers need to be added. If the amount of defoamers is too high, the concrete will have no "ball" effect, poor fluidity, poor wrapping, and difficult to construct. In order to improve the working performance of concrete, a certain amount of...

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Abstract

The invention discloses high-performance marine concrete with high water absorption and coarse aggregate. The concrete is prepared from the following raw materials in parts by mass: 280-400 parts of cement, 90-160 parts of fly ash, 680-750 parts of river sand, 900-1100 parts of coarse aggregate, 5-6.5 parts of a polycarboxylic acid water reducer and 160-170 parts of water. By a large number of concrete mixing ratio trials, and testing analysis and research of raw materials, the mixing ratio of the concrete with advantages that workability is good, slump meets construction requirements, mechanical properties meet design requirements, properties such as resistance to chloride ion permeability and the like all meet requirements of bridge concrete standards on the basis of long-term performance and durability is obtained, and accordingly, the appearance quality of the concrete is improved, and high performance of the concrete is achieved. The provided high-performance marine concrete withhigh water absorption and coarse aggregate is fully applied to the Maputo bridge project in Mozambique.

Description

technical field [0001] The invention relates to a high-performance marine concrete with large water absorption rate coarse aggregate and a construction method thereof. Background technique [0002] The Maputo Bridge in Mozambique is located on the arterial road from Maputo, the capital of Mozambique, to the border port of Casa Commercial between South Africa and Mozambique in the south. The total length of the main route is about 114 kilometers. Among them, Maputo Bridge is composed of south approach bridge, main bridge and north approach bridge. The main bridge is a suspension bridge scheme with a span of 680 meters. It is currently the largest suspension bridge in Africa. The Maputo Bridge spans the Maputo Bay. The natural conditions are complex. The chemical erosion environment of seawater has a moderate degree of corrosion on the structure (Class C) to extreme severity (Class F) according to different divisions. The design service life of the structure is 100 years. yea...

Claims

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Application Information

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IPC IPC(8): C04B28/04E04G21/02
CPCC04B28/04C04B2201/50E04G21/02C04B14/28C04B18/08C04B14/068C04B18/12C04B24/24
Inventor 杜飞周永涛白鹏宇肖仕周王昊卿关函非祝长春卞佳闫文亮张岩
Owner CHINA ROAD & BRIDGE
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