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A kind of cement for non-pressure steamed c80 concrete pile

A technology for concrete piles and free of pressure steaming is applied in the field of cement for concrete piles, which can solve the problems affecting the durability of concrete, shorten the construction period, delay and the like, and achieve the effects of saving energy consumption, short production period and low cost.

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

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Problems solved by technology

[0007] In order to solve the problem in the prior art that the presence of calcium sulfate in pipe pile concrete delays the ettringite reaction and affects the durability of concrete, the present invention proposes a pressure-free steamed C80 cement for concrete piles, through the selection of silicate Cement clinker is used as the basic cementing material, and through the specific proportioning design of mineral powder, silica fume and retarder, in the absence of gypsum, the pressure-free steamed C80 concrete pile prepared by the cement of the present invention can meet the requirements of the pile. requirements, and has the advantages of high volume stability, thereby improving the durability of non-pressure steamed concrete; and can be cured at 80-100 ° C, which has the advantage of shortening the construction period

Method used

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  • A kind of cement for non-pressure steamed c80 concrete pile

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A pressure-free steamed C80 cement for concrete piles comprises the following raw materials in mass percentage: 88.85% of Portland cement clinker, 8% of mineral powder, and 3% of silica fume.

[0029] After mixing the three materials evenly, add 0.15% sodium gluconate, and the performance indicators of the prepared cement for steam-free pipe pile concrete are as follows: the specific surface area is 410m 2 / kg, 80μm square hole sieve remaining 2%; initial setting time 18min, final setting time 40min; 3d flexural strength 6.7MPa, compressive strength 46.6MPa, 28d flexural strength 8.0MPa, compressive strength 60.5MPa.

[0030] In this embodiment, the mineral composition of Portland cement clinker is as follows: tricalcium silicate 55.3%, dicalcium silicate 18.3%, tricalcium aluminate 8.5%, tetracalcium aluminoferrite 14%, free calcium oxide 1%, calcined Lost 2.9%.

[0031] In the present embodiment, the specific surface area of ​​slag powder is 450m 2 / kg, fluidity rat...

Embodiment 2

[0034] A pressure-free steamed C80 cement for concrete piles comprises the following raw materials in mass percentage: 89.9% of Portland cement clinker, 5% of mineral powder, and 5% of silica fume.

[0035] After mixing the three materials evenly, adding 0.1% sodium gluconate, the performance indicators of the prepared non-pressure steamed C80 concrete pile cement are as follows: specific surface area 430m 2 / kg, 80μm square hole sieve residue 1.7%; initial setting time 17min, final setting time 41min; 3d flexural strength 6.5MPa, compressive strength 45.5MPa, 28d flexural strength 8.2MPa, compressive strength 62MPa.

[0036] In this embodiment, the mineral composition of Portland cement clinker is as follows: tricalcium silicate 58%, dicalcium silicate 18%, tricalcium aluminate 7.9%, tetracalcium aluminoferrite 12%, free calcium oxide 2.9%, calcined Lost 1.2%.

[0037] In the present embodiment, the specific surface area of ​​slag powder is 450m 2 / kg, fluidity ratio 90%, 7...

Embodiment 3

[0040] A pressure-free steamed C80 cement for concrete piles comprises the following raw materials in mass percentage: 66.8% of Portland cement clinker, 28% of mineral powder, and 5.0% of silica fume.

[0041] After mixing the three materials evenly, adding 0.2% sodium gluconate, the performance indicators of the prepared non-pressure steamed C80 concrete pile cement are as follows: the specific surface area is 450 m 2 / kg, 1% remaining on 80μm square hole sieve; initial setting time 21min, final setting time 45min; 3d flexural strength 4.3MPa, compressive strength 25.6MPa, 28d flexural strength 6.2MPa, compressive strength 52.3MPa.

[0042] In this example, the mineral composition of Portland cement clinker is as follows: tricalcium silicate 58%, dicalcium silicate 18%, tricalcium aluminate 8.2%, tetracalcium aluminoferrite 12%, free calcium oxide 0.9%, calcined Lost 2.9%.

[0043] In the present embodiment, the mineral powder specific surface area is 425 m 2 / kg, fluidity ...

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Abstract

The invention discloses a pressure-free steamed C80 cement for concrete piles, which belongs to the technical field of cement. The cement of the invention comprises the following raw materials in mass percentage: 66.8-93% of portland cement clinker, 5-28% of mineral powder, 2-5% of silica fume, and 0.1-0.2% of sodium gluconate. The invention mainly solves the problem in the prior art that DEF reaction occurs during the maintenance process of the non-pressure steamed concrete pile, which affects the volume stability and durability of the concrete, and has the advantages of improving the volume stability of the pipe pile and shortening the construction period.

Description

technical field [0001] The invention relates to a cement for concrete piles, in particular to a cement for pressure-free steamed C80 concrete piles. Background technique [0002] At present, after the high-strength concrete 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 takes 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): C04B28/04
Inventor 夏艳晴王田堂
Owner JIAHUA SPECIAL CEMENT
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