Concrete for pressure steam free PHC piles

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

Active Publication Date: 2016-03-09
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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  • Concrete for pressure steam free PHC piles
  • Concrete for pressure steam free PHC piles
  • Concrete for pressure steam free PHC piles

Examples

Experimental program
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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 high-efficiency water reducer, 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...

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 400m 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 dis...

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 superplasticizer, 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 450m 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 for 20%, 1.18mm...

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Abstract

The invention discloses a concrete for pressure steam free PHC piles and belongs to the technical field of cement. The concrete comprises the following raw materials: silicate cement (425 to 500 kg / m3), medium sand (670 to 700 kg / m3), stone (1130 to 1200 kg / m3), water (119 to 140 kg / m3), and naphthalene high efficient water reducer (8 to 9.5 kg / m3); wherein the silicate cement comprises the following raw materials in percentage by weight: 76.85 to 93% of silicate cement clinker, 5 to 18% of phosphor slag, 2 to 5% of silica fume, and 0 to 0.15% of sodium gluconate. In the prior art, during the maintenance process of pressure steam free PHC concrete, DEF reaction happens, the concrete volume stability and durability are influenced by the DEF reaction, the provided concrete solves the problems mentioned above, thus the pile volume stability and durability are both improved, and the construction period is shortened.

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 pressure steam, and goes through four stages of static stop, heating, constant temperature, and cooling. 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 serious ...

Claims

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Application Information

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Patent Type & Authority Applications(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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