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Composition and preparation method of plateau railway concrete

A concrete and railway technology, applied in the field of building materials, can solve the problems of poor frost resistance, slow development of early strength, difficult preparation of railway concrete, etc., and achieve the effect of reducing adsorption and prolonging mixing time.

Pending Publication Date: 2021-02-02
RAILWAY ENG RES INST CHINA ACADEMY OF RAILWAY SCI +3
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  • Claims
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AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a composition and preparation method of plateau railway concrete, so as to solve the problem of difficult preparation of railway concrete in areas where fly ash and slag powder resources are scarce, and at the same time overcome the poor stability of concrete bubbles and the slow development of early strength in the plateau climate environment. Poor frost resistance and other issues

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  • Composition and preparation method of plateau railway concrete
  • Composition and preparation method of plateau railway concrete

Examples

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Embodiment 1

[0020] Example 1: C40 Concrete Preparation

[0021] Wherein the total amount of cementitious material is 400kg, the water-cement ratio is 0.36, the sand ratio is 44%, and the igneous rock mineral admixture is 25%, and the igneous rock mineral admixture is specifically selected from Changdu area igneous rock minerals (with andesite minerals as main) and mineral modifiers (including 95-grade semi-encrypted silica fume, low-heat Portland cement clinker, triethanolamine and sodium sulfate, etc.), its specific performance indicators are as shown in Table 1, Example 1 The concrete mix ratio is shown in Table 2:

[0022] Table 1 Performance testing index of igneous rock mineral admixture

[0023] serial number Test items measured value 1 Fineness (residue of 45μm square hole sieve) 10.8％ 2 Mobility ratio 100％ 3 56d activity index 75％ 4 Loss on ignition 6.0％ 5 Sulfur trioxide content 0.8％ 6 Chloride content 0.03％ 7 water c...

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Abstract

The invention belongs to the field of building materials, and particularly relates to composition and a preparation method of plateau railway concrete. The plateau railway concrete is specifically prepared from the following components in percentage by mass: 15%-18% of a cementing material, 70%-80% of aggregate, 5%-7% of mixing water and 1.5%-1.8% of a chemical additive in a certain stirring manner. The method is suitable for preparing railway concrete in areas with serious shortage of coal ash and slag powder resources such as Sichuan and Tibet, and can effectively solve the problems of poorbubble stability, low early strength, poor frost resistance and the like of concrete in plateau areas.

Description

technical field [0001] The invention belongs to the field of building materials, and in particular relates to the composition and preparation method of plateau railway concrete. Background technique [0002] The Sichuan-Tibet Railway starts from Chengdu, Sichuan Province in the east, and passes through Ya’an, Kangding, Qamdo, Nyingchi, and Shannan to Lhasa in the west, with a total length of 1567km. At present, the Lhasa-Nyingchi section of the Sichuan-Tibet Railway (referred to as the Lalin Railway) has completed the construction of the main project and has begun to enter the stage of rail laying. [0003] The survey found that during the construction of the Lalin Railway, fly ash and other mineral admixtures for concrete were transported by rail and automobile from Qinghai, Gansu and other places. Due to the impact of the economic situation and environmental protection policies in recent years, The output of fly ash in Qinghai, Gansu and other places is shrinking year by ...

Claims

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Application Information

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IPC IPC(8): C04B28/04C04B111/20
CPCC04B28/04C04B2111/0075C04B2111/20C04B2201/50C04B14/14C04B18/146C04B22/147C04B24/122C04B14/02C04B14/06C04B2103/302C04B2103/304C04B2103/10C04B2103/0068
Inventor 李康王希胡建伟谢永江冯仲伟李林香谭盐宾程冠之刘竞李书明董全霄刘子科王月华王振杨鲁葛昕饶云兵谢亮胡凡齐婧刘婷婷何庆
Owner RAILWAY ENG RES INST CHINA ACADEMY OF RAILWAY SCI