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C50 self-compacting concrete for bridges and its preparation method

A self-compacting concrete and concrete technology, applied in the field of building materials, can solve the problems of low elastic modulus and high-quality mineral admixtures, and achieve the effects of alleviating construction noise pollution, shortening the construction period, and increasing the degree of freedom

Active Publication Date: 2016-05-04
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 bridges and its preparation method

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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. The 45μm square hole sieve residue of the secondary fly ash is not more than 25%, loss on ignition is not more than 8%, water demand is not more than 105%; add Stir 6.36kg of water reducing agent and 163kg of water for 1min, then put in 946kg of crushed stone with a particle size range of 5-20mm, continuous grading, mud content less than 0.5%, stir for 2min, stir and form to prepare C50 self-compacting concrete for bridge .

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% and stir for 0.5min. The 45μm square-hole sieve residue of the secondary fly ash is not more than 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 water reducing agent and 170kg of water, stir for 1min, and then put in the particle size range of 5-20mm, continuous gradation, mud content 932kg of crushed stone of less than 0.5% was mixed for 2 minutes, and then mixed and formed into C50 self-compacting concrete for bridge.

Embodiment 3

[0027] Take 385kg of P·II cement, 165kg of secondary fly ash, 750kg of medium sand with a fineness modulus of 2.8 and a mud content of less than 1.0% and stir for 0.5min. The 45μm square hole sieve residue of the secondary fly ash is not more than 25%, the ignition loss is not more than 8%, and the water demand is not more than 105%; add HP400 water reducing agent 7.7kg and water 176kg and stir for 1min, then put in the particle size range of 5-20mm, continuous grading, and the mud content is less than 0.5 % Of crushed stone is 917kg, mixed for 2min, and then formed into a C50 self-compacting concrete for bridge.

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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, and particularly relates 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 properties, non-segregation, mechanical properties after hardening, good compactness and durability, and strong resistance to external environmental corrosion. Self-compacting concrete technology is in Europe, America and Japan. Developed countries have basically become mature, and they have replaced ordinary concrete in a large number of applications in various projects, and have brought very significant economic benefits. [0003] However, the original self-compacting concrete has a large slurry concentration ratio, a large amount of cementitious materials, high early hydration heat, relatively low elastic modulus, and relatively high cost, so self-compacting concrete has not been widely used in bridge e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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