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A kind of concrete for pressure-free steaming phc pipe pile

A PHC pipe pile and concrete technology, applied in the field of concrete piles, can solve the problems of delaying ettringite, affecting the durability of concrete, shortening the construction period, etc., to achieve the effects of balancing fluidity and stability, saving energy consumption and shortening construction period

Active Publication Date: 2017-10-24
JIAHUA SPECIAL CEMENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to solve the problem in the prior art that the ettringite reaction is delayed due to the existence of gypsum in the pipe pile concrete and the durability of the concrete is affected, the present invention proposes a pressure-free steamed PHC pipe pile concrete, by selecting specific cement clinker and The combined use of other raw materials can meet the requirements for the use of pipe pile concrete without gypsum, and has the advantages of improving the volume stability and durability of pipe piles and shortening the construction period.

Method used

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  • A kind of concrete for pressure-free steaming phc pipe pile
  • A kind of concrete for pressure-free steaming phc pipe pile
  • A kind of concrete for pressure-free steaming phc pipe pile

Examples

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Effect test

Embodiment 1

[0028] A concrete for pressure-free steamed PHC pipe piles, containing the following raw materials per m³ of concrete: 500kg of Portland cement, 9.5kg of naphthalene-based superplasticizer, 670kg of medium sand, 1200kg of gravel, and 140kg of water.

[0029] In the present embodiment, Portland cement comprises the following raw materials by mass percentage: 93% of Portland cement clinker, 5% of phosphorus slag, 2.3% of silica fume, and 0.15% of sodium gluconate; the specific surface area of ​​Portland cement is 360m 2 / kg, 1% remaining on 80μm square hole sieve; initial setting time 20min, final setting time 40min; 3d flexural strength 5.8MPa, compressive strength 32.5MPa, 28d flexural strength 7.8MPa, compressive strength 52.5MPa.

[0030] In this example, the mud content of the medium sand is 0.3%, the fineness modulus is 3.0, and the gradation distribution: 4.75mm standard sieve accounts for 6%, 2.36mm standard sieve accounts for 20%, 1.18mm standard sieve The sieve residu...

Embodiment 2

[0034] A concrete for pressure-free steamed PHC pipe piles, containing the following raw materials per m³ of concrete: 425kg of Portland cement, 8kg of naphthalene-based high-efficiency water reducer, 700kg of medium sand, 1170kg of gravel, and 119kg of water.

[0035] The Portland cement of the present embodiment comprises the following raw materials by mass percentage: Portland cement clinker 77%, phosphorus slag 18%, silica fume 5%, sodium gluconate 0%; The ratio of the phosphorus slag of the present embodiment Surface area is 400 m 2 / kg.

[0036] The specific surface area of ​​the portland cement of the present embodiment is 380m 2 / kg, 0.5% remaining on 80μm square hole sieve; initial setting time 18min, final setting time 37min; 3d flexural strength 4.8MPa, compressive strength 25.5MPa, 28d flexural strength 5.7MPa, compressive strength 45.5MPa.

[0037] In this example, the mud content of the medium sand is 0.3%, the fineness modulus is 3.0, and the sand gradation di...

Embodiment 3

[0041] A concrete for pressure-free steamed PHC pipe piles, containing the following raw materials per m³ of concrete: 475kg of Portland cement, 9kg of naphthalene-based high-efficiency water reducer, 670kg of medium sand, 1130kg of gravel, and 133kg of water.

[0042] Portland cement in this embodiment comprises: Portland cement clinker 88.9%, phosphorus slag 8%, silica fume 3%, sodium gluconate 0.1%; The specific surface area of ​​described phosphorus slag is 450 m 2 / kg.

[0043] The specific surface area of ​​the portland cement of the present embodiment is 380m 2 / kg, 80μm square hole sieve remaining 2%; initial setting time 18min, final setting time 47min; 3d flexural strength 5.8MPa, compressive strength 33.5MPa, 28d flexural strength 6.6MPa, compressive strength 50MPa.

[0044] In this example, the mud content of the medium sand is 0.3%, the fineness modulus is 3.0, and the gradation distribution: 4.75mm standard sieve accounts for 6%, 2.36mm standard sieve accounts f...

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Abstract

The invention discloses a concrete for pressure-free steamed PHC pipe piles, which belongs to the technical field of cement. The concrete of the present invention includes the following raw materials configured by weight: Portland cement 425-500kg / m3, medium sand 670-700kg / m3, gravel 1130-1200kg / m3, water consumption 119-140kg / m3, naphthalene-based high-efficiency water-reducing 8~9.5kg / m3; the Portland cement includes the following raw materials composed by mass percentage: Portland cement clinker 76.85~93%, phosphorus slag 5~18%, silica fume 2~5%, gluconic acid Sodium 0-0.15%. The invention mainly solves the problems in the prior art that DEF reaction occurs during the curing process of the non-pressure steamed PHC concrete, which affects the volume stability and durability of the concrete, and has the advantages of improving the volume stability and durability of pipe piles and shortening the construction period.

Description

technical field [0001] The invention relates to a concrete pile, in particular to a concrete for a pressure-free steamed PHC pipe pile. Background technique [0002] At present, after the high-strength concrete pipe pile is centrifugally formed, it is first cured by atmospheric steam, and goes through four stages of static stop, temperature rise, constant temperature, and temperature drop. The temperature is 60°C to 70°C, and the time is 4 to 7 hours. Then demoulding, and then steam curing. Autoclave is used for autoclave curing. During curing, the steam pressure reaches 0.9MPa-1.0MPa, the temperature is around 180°C, and the curing time lasts for 7-10 hours. During the steam curing process of concrete, due to the rapid rise and fall of temperature, the temperature difference between the inside and outside of the pipe pile concrete is too large, and the pipe pile body is prone to cracks, or even cracks, resulting in a decrease in the strength of the concrete pipe pile and a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/04C04B24/10C04B18/04C04B14/06C04B14/02
CPCY02W30/91
Inventor 夏艳晴王田堂
Owner JIAHUA SPECIAL CEMENT
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