C50 self-compacting concrete for bridge and preparation method thereof

A self-compacting concrete and concrete technology, applied in the field of building materials, can solve problems such as low elastic modulus and high-quality mineral admixture, and achieve the effects of alleviating construction noise pollution, low hydration heat, and improving the environment

Active Publication Date: 2014-12-03
JIANGMEN XINHUI DISTRICT TIANHAI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the low elastic modulus of existing self-compacting concrete and the shortage of high-quality mineral admixtures, the present invention provides a C50 self-compacting concrete for bridges and its preparation method

Method used

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  • C50 self-compacting concrete for bridge and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Take 357kg of P II cement, 153kg of secondary fly ash, 774kg of medium sand with a fineness modulus of 2.3 and a mud content of less than 1.0%, and stir for 0.5min. 25%, loss on ignition is not more than 8%, water demand is not more than 105%; add 6.36kg of water reducing agent and 163kg of water were stirred for 1min, and then 946kg of crushed stones with a particle size range of 5 to 20mm were added, continuously graded, and the mud content was less than 0.5%, stirred for 2min, and the C50 self-compacting concrete for bridges was prepared by stirring and forming .

Embodiment 2

[0025] Take 371kg of P II cement, 159kg of secondary fly ash, and 762kg of medium sand with a fineness modulus of 2.5 and a mud content of less than 1.0%. Stir for 0.5min. 25%, the loss on ignition is not more than 8%, and the water demand is not more than 105%. Add 6.36kg of SKD-14 superplasticizer and 170kg of water and stir for 1min, then put in a particle size range of 5-20mm, continuous grading, and mud content 932kg of crushed stones with less than 0.5% were stirred for 2 minutes, and the mixture was formed by stirring to prepare C50 self-compacting concrete for bridges.

Embodiment 3

[0027] Take 385kg of P II cement, 165kg of secondary fly ash, and 750kg of medium sand with a fineness modulus of 2.8 and a mud content of less than 1.0%. Stir for 0.5min. 25%, the loss on ignition is not more than 8%, and the water demand is not more than 105%. Add 7.7kg of HP400 water reducer and 176kg of water and stir for 1min, then put in a particle size range of 5-20mm, continuous grading, and the mud content is less than 0.5 % crushed stone 917kg, stirred for 2 minutes, and stirred to form the C50 self-compacting concrete for bridges.

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Abstract

The invention relates to a C50 self-compacting concrete for a bridge. The C50 self-compacting concrete comprises the following components per cubic meter by weight: 340-430kg of cement, 100-200kg of fly ash, 700-780kg of sand, 900-950kg of detritus, 5-7.7kg of high-performance polycarboxylic acid water reducer and160-180kg of water. The preparation method of the C50 self-compacting concrete for the bridge comprises the following steps of mixing cement, fly ash and sand at a ratio, stirring for 0.5 minute, adding the high-performance polycarboxylic acid water reducer, stirring for 1 minute, and then putting detritus, stirring for 2 minutes and shaping. The elastic modulus and 7d strength of the C50 self-compacting concrete for the bridge reach the requirement on the concrete for the bridge, and the cost is lower as compared with the original C50 ordinary concrete for the bridge; and meanwhile, due to adoption of the self-compacting concrete, the vibrating process can be also eliminated, the continuous construction can be carried out, the vibrating cost is reduced, the construction period is shortened and the significant economic benefits are achieved.

Description

technical field [0001] The invention belongs to the field of building materials, in particular to a bridge concrete and a preparation method thereof. Background technique [0002] At present, self-compacting concrete has high fluidity, high workability and high filling capacity, no segregation, good mechanical properties, compactness and durability after hardening, and strong resistance to external environmental erosion. Self-compacting concrete technology is popular in Europe, America and Japan. Developed countries have basically matured, and a large number of them have been used in various projects instead of ordinary concrete, and have brought very significant economic benefits. [0003] However, the original self-compacting concrete is not widely used in bridge engineering due to its large slurry-concentration ratio, large amount of cementitious materials, high early hydration heat, relatively low elastic modulus, and relatively high cost. On the other hand, the prepara...

Claims

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Application Information

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IPC IPC(8): C04B28/04C04B18/08
CPCY02W30/91
Inventor 赵庆新丁小平邱月徐秋实张建勋邓力源
Owner JIANGMEN XINHUI DISTRICT TIANHAI
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