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Marine concrete

A technology of marine concrete and cementitious materials, which is applied in the field of construction concrete and can solve the problems of low anti-corrosion performance and poor durability

Inactive Publication Date: 2014-07-23
CHONGQING CONSTR BRIDGE ENG +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a kind of marine concrete with strong anticorrosion performance and good durability for marine construction in view of the shortcomings of low anticorrosion performance and poor durability of existing concrete for marine use

Method used

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Embodiment Construction

[0011] 1. Preparation of raw materials

[0012] 1. Cement

[0013] Guangxi Fusui Xinning Conch P.O42.5 Ordinary Portland Cement is used, and its main testing indicators are shown in Table 1

[0014] Table 1 P.O42.5 cement technical indicators

[0015]

[0016] The fineness of cement should not be too fine, otherwise it will cause problems of excessive heat of hydration and increased water demand, which will cause a decrease in the crack resistance of concrete. At the same time, considering the low heat of hydration requirements of the large-volume concrete of the tower base, the strength grade should be selected. 42.5 ordinary Portland cement, in order to avoid the occurrence of alkali-aggregate reaction, the alkali content in the cement is ≤0.6%. In order to make the cement have good compatibility with the high-efficiency water-reducing agent and give full play to the water-reducing rate of the high-efficiency water-reducing agent, it is advisable to control the C3A cont...

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Abstract

The invention discloses marine concrete. The marine concrete is characterized by being prepared from the following raw materials in parts by weight: 380-500 parts of cementing material, namely 175-225 parts of cement, 135-163.8 parts of mineral powder and 79-100 parts of coal ash, 730-773 parts of fine aggregate, 1050-1112 parts of coarse aggregate, 150 parts of water and 14.22-19.5 parts of additive. The marine concrete disclosed by the invention overcomes the defects of the existing marine concrete of low corrosion resistance and poor durability and can be applied to marine construction with strong corrosion resistance and good durability.

Description

technical field [0001] The invention belongs to the field of building concrete, and in particular relates to marine concrete. Background technique [0002] In the construction of marine engineering, because seawater is rich in chloride ions and sulfates, it is extremely corrosive to concrete. Therefore, the durability and corrosion resistance of concrete used in marine construction are particularly important. One of the main reasons is the factors of the concrete itself. The alkaline substances in the concrete react with the acidic substances, causing the pH value of the concrete pore solution to decrease, thereby reducing the alkalinity of the concrete and making the steel bars lose the protection of the passivation layer. The second is the chloride ions carried by the concrete itself and rich in seawater. The chloride ions have a small radius and strong penetrating ability. They are extremely strong depassivating agents. The pH value decreases rapidly, thereby destroying ...

Claims

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Application Information

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IPC IPC(8): C04B28/08C04B111/24
Inventor 罗森勇徐浩
Owner CHONGQING CONSTR BRIDGE ENG
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