Functional admixture used for early tensioning prestressed structural concrete and purposes of functional admixture

A prestressed structure and admixture technology, which is applied in sustainable waste treatment, solid waste management, climate sustainability, etc., can solve the problems of long construction period and long prestressed age, and achieve high elastic modulus in the early stage. , The effect of improving the early elastic modulus and reducing the turnover cycle of the template

Inactive Publication Date: 2012-07-18
RAILWAY ENG RES INST CHINA ACADEMY OF RAILWAY SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Applying this functional admixture to the preparation of cast-in-place beam concrete can effectively solve the problems of long pre-stress age and long construction period of traditional cast-in-place beam concrete

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Carbonate stone powder preparation: Calcite is crushed and ground into carbonate stone powder.

[0025] The proportion of functional admixture is: carbonate stone powder: 70%; fly ash: 10%; ground slag powder: 20%.

[0026] Concrete mix ratio (kg / m 3 ): Cement: 384; Functional admixture: 96; Fine aggregate: 750; Coarse aggregate: 1080; Water: 129; Water reducing agent: 4.8.

[0027] Concrete properties: initial slump 220mm, air content 2.4%, 1d compressive strength 34.9MPa, 3d compressive strength 50.8MPa, 28d compressive strength 59.1MPa, 1d elastic modulus 27.1GPa, 3d elastic modulus 37.5GPa, the Concrete is used for the construction of cast-in-place beams, and the tension requirements can be met in 3d.

Embodiment 2

[0029] Carbonate stone powder preparation: Dolomite is crushed and ground into carbonate stone powder.

[0030] The proportion of functional admixtures is: carbonate stone powder: 95%; ground slag powder: 5%.

[0031] Concrete mix ratio (kg / m 3 ): Cement: 376; Functional admixture: 75; Fine aggregate: 760; Coarse aggregate: 1050; Water: 152; Water reducing agent: 1.9.

[0032] Concrete properties: initial slump 200mm, air content 3.1%, 3d compressive strength 53.6MPa, 5d compressive strength 64.5MPa, 28d compressive strength 74.8MPa, 3d elastic modulus 40.5GPa, 28d elastic modulus 47.2GPa, the Concrete is used for the construction of cast-in-place beams, and the tension requirements can be met in 3d.

Embodiment 3

[0034] Carbonate stone powder preparation: the tailings and stone chips in the limestone mining process are crushed and ground into carbonate stone powder.

[0035] The proportion of functional admixtures is: carbonate stone powder: 40%, silica fume 20%, fly ash: 40%;

[0036] Concrete mix ratio (kg / m 3 ): Cement: 488; Functional admixture: 166; Fine aggregate: 601; Coarse aggregate: 1116, Water: 195.2, Water reducing agent: 5.6;

[0037] Concrete properties: initial slump is 180mm, air content is 3.8%, 3d compressive strength 42.2MPa, 28d compressive strength 57.2MPa, 3d elastic modulus 42.3GPa, this concrete is used for cast-in-place beam construction, 3d can satisfy tension Claim.

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PUM

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Abstract

The invention relates to a functional admixture used for early tensioning prestressed structural concrete. The functional admixture comprises the following materials in percent by weight: 5%-95% of carbonate stone powder and mineral admixture; the carbonate stone powder is obtained by processing carbonate ores through processes such as breaking and fine grinding. A preparation process comprises the following steps of: grinding the carbonate ores into fine powder, and uniformly mixing with other mineral powders according to the proportion to obtain the functional admixture. The prepared functional admixture is applied in preparation of cast-in-situ beam concrete; the concrete capable of meeting fast tensioning requirement can be prepared under the premise without increasing the design strength of the concrete; and the problems that the conventional in-cast-situ beam concrete is long in prestressed age and long in construction period are solved.

Description

Technical field [0001] The invention relates to a functional admixture used for early tension prestressed structural concrete. Background technique [0002] The main function of high-speed railway bridges is to provide smooth and stable lines on the bridge for high-speed trains to ensure operational safety and ride comfort; the bridge should have sufficient vertical, horizontal, longitudinal and torsional rigidity to minimize various deformations of the structure ; Avoid axle resonance or excessive vibration of the structure. Due to the outstanding features of bridges, such as saving land resources and easy quality control, the design concept of bridges leading the way has been widely used in the design of high-speed railways and passenger dedicated lines. There are many viaducts, long bridges, and long-span bridges, and a large proportion of bridges is one of the typical features of my country's high-speed railways. Taking the Beijing-Shanghai high-speed railway as an example,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B18/14C04B14/26C04B18/12C04B28/00
CPCY02W30/91
Inventor 李化建赵国堂易忠来谢永江
Owner RAILWAY ENG RES INST CHINA ACADEMY OF RAILWAY SCI
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