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A kind of cementitious material for pressure-free steaming phc pipe pile

A technology of PHC pipe piles and cementitious materials, applied in the field of cementitious materials, can solve the problems of shortening the construction period, affecting the durability of concrete, delaying, etc., and achieve the effects of saving energy consumption, low cost and short production cycle

Active Publication Date: 2017-10-27
JIAHUA SPECIAL CEMENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] 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 PHC pipe pile. The material is used as the basic cementing material, and through the specific ratio design of phosphorus slag, silica fume and retarder, in the absence of gypsum, the pressure-free steamed PHC pipe pile prepared by the cementitious material 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 cementitious material for pressure-free steaming phc pipe pile

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A cementitious material for pressure-free steamed PHC pipe piles, comprising the following raw materials in mass percentage: 88.85% of Portland cement clinker, 8% of phosphorus slag, and 3% of silica fume.

[0031] After mixing the three materials evenly, the performance indicators of the gelling material for pressure-free steaming PHC pipe piles prepared by adding 0.15% sodium gluconate are as follows: the specific surface area is 405m 2 / kg, 80μm square hole sieve remaining 3%; initial setting time 18min, final setting time 45min; 3d flexural strength 4.5MPa, compressive strength 28.6MPa, 28d flexural strength 6.2MPa, compressive strength 58MPa.

[0032] 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%.

[0033] In the present embodiment, the specific surface area of ​​phosphoru...

Embodiment 2

[0036] A cementitious material for pressure-free steamed PHC pipe piles, comprising the following raw materials in mass percentage: 89.9% of Portland cement clinker, 5% of phosphorus slag, and 5% of silica fume.

[0037] After mixing the three materials evenly, adding 0.1% sodium gluconate, the performance index of the prepared pressure-free steamed PHC pipe pile cementing material is as follows: the specific surface area is 415m 2 / kg, 80μm square hole sieve residue 1.7%; initial setting time 17min, final setting time 41min; 3d flexural strength 5.2MPa, compressive strength 36.6MPa, 28d flexural strength 6.8MPa, compressive strength 60.5MPa.

[0038] 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%.

[0039] In the present embodiment, the specific surface area of ​​phosphorus slag is 450m...

Embodiment 3

[0042] A cementitious material for pressure-free steaming PHC pipe piles, comprising the following raw materials in mass percentage: 74.95% of Portland cement clinker, 20% of phosphorus slag, and 5.0% of silica fume.

[0043] After mixing the three materials evenly, adding 0.05% sodium gluconate, the performance indicators of the prepared pressure-free steamed PHC pipe pile cementing material are as follows: the specific surface area is 450m 2 / kg, 1% remaining on 80μm square hole sieve; initial setting time 21min, final setting time 48min; 3d flexural strength 4.0MPa, compressive strength 20.6MPa, 28d flexural strength 5.2MPa, compressive strength 45.5MPa.

[0044] 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%.

[0045] In the present embodiment, the specific surface area of ​​phosphorus ...

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Abstract

The invention discloses a gel material for an autoclaving-free PHC tubular pile and belongs to the technical field of cement. The gel material comprises, by mass, 75-97% of portland cement clinker, 1-20% of phosphor slag, 2-5% of silica fume and 0-0.15% of sodium gluconate. The gel material has the advantages of good volume stability and high endurance and can be maintained at a temperature of 80-100 DEG C so that a construction period is shortened and an engineering cost is reduced.

Description

technical field [0001] The invention relates to a gelling material, in particular to a gelling material for pressure-free steamed PHC pipe 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 ser...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/04C04B24/10C04B18/14C04B18/04
CPCC04B40/0039C04B7/02C04B24/10C04B18/146C04B18/0481Y02W30/91
Inventor 王田堂夏艳晴
Owner JIAHUA SPECIAL CEMENT
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