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Anti-decomposable corrosion hydraulic concrete mixed proportion design method

A hydraulic concrete and mix ratio design technology, which is applied in the analysis of materials, strength characteristics, weather resistance/light resistance/corrosion resistance, etc., can solve the problems of no clear analysis of the impact of concrete's resistance to decomposition and corrosion, and achieve excellent performance Effect

Active Publication Date: 2018-04-20
黑龙江牡丹江抽水蓄能有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The specification only stipulates the cement type, admixture type, maximum water-binder ratio and impermeability grade, and there is no clear analysis of the influence of various factors in the mix ratio on the concrete's resistance to decomposition and corrosion

Method used

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  • Anti-decomposable corrosion hydraulic concrete mixed proportion design method
  • Anti-decomposable corrosion hydraulic concrete mixed proportion design method
  • Anti-decomposable corrosion hydraulic concrete mixed proportion design method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] This embodiment provides a method for designing the mix ratio of anti-decomposition erosion hydraulic concrete, including the following steps:

[0026] Step 1) Take the five factors of cement type, water reducing agent type, air-entraining agent type, admixture dosage, and water-binder ratio as the investigation objects of the orthogonal test, and conduct the orthogonal test;

[0027] Step 2) According to the orthogonal table design in the orthogonal test, the concrete is formed according to each proportion, and the slump is controlled at 50~90. Mortar specimens with the same shape and volume should be cured in static water at 20°C after hardening;

[0028] Step 3) Put the proportioned mortar specimens after curing for the same time into CO2 at a constant speed. 2 The erosion test was carried out in the water, and after the erosion lasted for 80-100 days, the cumulative dissolution ratio of CaO in the erosion age process of each group of test pieces was calculated, and...

Embodiment 2

[0033] On the basis of Example 1, this example takes the anti-decomposition erosion concrete of design grade C30 as an example, and proceeds to the concrete mix design according to the following steps:

[0034] Step 1) Study the four types of cement used in a certain project (composite Portland cement, Portland cement, medium heat Portland cement, ordinary Portland cement), four fly ash content (0% , 10%, 20%, 30%), three types of water reducing agents (polycarboxylate high-performance water reducing agents, naphthalene-based high-efficiency air-entraining agent, dodecylbenzene sulfonate air-entraining agent, polyoxyethylene ether sodium sulfate air-entraining agent) and four water-binder ratios (0.30, 0.40, 0.50, 0.60) for the corrosion resistance of the decomposition of concrete Influence, the design orthogonal table is shown in Table 1.

[0035] Table 1 Instance 2 Orthogonal table design

[0036]

[0037] Step 2) According to the orthogonal table design table 1, form t...

Embodiment 3

[0070] In this embodiment, taking the anti-decomposition erosion concrete of the design grade C25 as an example, the concrete mix ratio design is carried out in accordance with the following steps:

[0071] Step 1)-step 3) is the same as embodiment 2;

[0072] Step 4) Concrete preparation strength: refer to Example 2, the concrete preparation strength table is shown in Table 11, and the strength curve test results are the same as Table 8 in Example 2.

[0073] Table 11 Concrete preparation strength table

[0074]

[0075] Preliminary mix ratio: the water-binder ratio and the selected strength curve fitting formula of fly ash content are calculated, and the water-binder ratio of each level of concrete is preliminarily selected. The main parameters of the primary mix ratio determined from this are shown in Table 12 and Table 13.

[0076] Table 12 Primary selection mix ratio

[0077]

[0078] Table 13 Amount of Concrete Materials

[0079]

[0080] Step 5) Review and ...

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Abstract

The invention provides an anti-decomposable corrosion hydraulic concrete mixed proportion design method comprising the steps: firstly, determining significant affecting factors on concrete anti-decomposable corrosion by an orthogonal test method, and analyzing and selecting various factors by combining concrete grade, durability and other design requirements; and then carrying out concrete strength curve test, combining with the strength curve test result, and concrete grade, durability and other design requirements and the concrete anti-decomposable corrosion test result, and calculating themixed proportion parameters of reference concrete by an absolute volume method. On the basis of guaranteeing the basic performance parameters of concrete, the effect of various factors on the concreteanti-decomposable corrosion ability is investigated by decomposed erosion tests, the step of improving the concrete anti-decomposable corrosion ability is introduced to the mixed proportion design, the problems existing in a decomposed erosion environment are solved, the anti-decomposable corrosion ability is enhanced, the durability of the concrete is enhanced, and the service life of buildingsis prolonged.

Description

technical field [0001] The invention belongs to the technical field of concrete mix proportion design, and in particular relates to a mix proportion design method of anti-decomposition erosion hydraulic concrete. Background technique [0002] Concrete corrosion damage is a common problem in the durability of hydraulic concrete. White dissolution deposits similar to stalactites can be seen in the leaks of most domestic hydraulic structures. Shortly after the construction of the Laxiwa Hydropower Station, a large amount of white leaching sediments appeared. my country's Yanguoxia, Bapanxia, ​​Fengman, Xin'anjiang, Chencun, Yunfeng, Luoan and other dams all have corrosion diseases to varying degrees. [0003] According to the provisions of GB 50287-2006 in the "Code for Geological Survey of Hydropower Engineering" on the evaluation of concrete corrosion by environmental water, the decomposition type of corrosion includes three types: dissolution type, general acid type, and ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/38G01N17/00G01N31/16G01N3/08G01N3/00
CPCG01N3/00G01N3/08G01N17/00G01N31/16G01N33/383G01N2203/0019
Inventor 纪光磊孙宇飞苑海龙胡炜崔志刚鲁恩龙毕亚丽
Owner 黑龙江牡丹江抽水蓄能有限公司
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