CN103274648A - Granite stone powder doped high-strength concrete tubular pile and production method thereof - Google Patents

Abstract

The invention relates to a high-strength concrete pipe pile mixed with granite stone powder used in the civil engineering industry. The concrete used for producing the concrete pipe pile is mixed with granite stone powder. The present invention also provides a production method of the high-strength concrete pipe pile. The method is as follows: put cement, crushed stone, river sand, finely ground sand and granite stone powder in a certain proportion into the mixer and pre-stir for 30 seconds, and then add Water and water reducer are stirred, and after the stirring is completed, the stirring material is evenly layered and continuously poured from one end of the pipe pile mold, then centrifugally formed, and finally cured. The high-strength concrete pipe pile mixed with granite stone powder produced by the method has high strength, good performance, energy saving and environmental protection.

Description

High-strength concrete pipe pile mixed with granite stone powder and its production method

technical field

The invention relates to a high-strength concrete pipe pile mixed with granite rock powder for the civil engineering industry and a production method thereof.

Background technique

In the prior art, the cementing material used in the production of prestressed centrifugal high-strength concrete pipe piles (referred to as PHC pipe piles, the strength grade of the centrifugal concrete of the pile body shall not be lower than C80) is high-grade Portland cement or ordinary silicate cement of grade 42.5 or above. Salt cement, the invention patent of publication number CN 101672035A proposes "prestressed high-strength concrete pipe piles produced by mixing fine river sand and its production method". The performance of concrete reaches and exceeds the performance of PHC pipe piles and concrete without grinding fine river sand, but it uses a large amount of river sand, which is a non-renewable resource. A large amount of mining not only destroys the original river and farmland , caused adverse effects on the environment, but also caused many engineering accidents. In the invention patent of publication number CN 1133771A, the "process of producing prestressed high-strength concrete pipe piles mixed with fine construction sand" is proposed. Although the invention patent uses construction waste, the admixture needs to be ground to a certain fineness. It needs a lot of manpower, material resources and financial resources, and it is not easy to promote in an all-round way. In the invention patent of publication number CN 1598164A, "concrete pipe pile mixed with ground fine slag powder and its production method" is proposed, but there is no report on the production of high-strength concrete pipe pile mixed with granite stone powder in a certain proportion to replace cement or finely ground sand , Using granite stone powder to replace cement or ground fine sand in a certain proportion can not only make full use of stone processing waste, protect the environment, but also improve the performance of pipe pile concrete while saving cement and river sand resources.

Contents of the invention

The object of the present invention is to provide a high-strength concrete pipe pile mixed with granite stone powder and its production method. The high-strength concrete pipe pile mixed with granite stone powder produced by the method has high strength, good performance, energy saving and environmental protection.

The object of the present invention is achieved by the following technical solutions: a high-strength concrete pipe pile mixed with granite stone powder, including a concrete pipe pile, and the concrete used for producing the concrete pipe pile is mixed with granite stone powder.

Further, the reference mix ratio of the concrete used to produce the concrete pipe pile is:

Cement: gravel: river sand: finely ground sand: water: water reducing agent = 0.5~0.7: 2.0~4.0: 1.0~2.0: 0.3~0.5: 0.25~0.4: 0.01~0.03

And replace 10% to 100% of the finely ground sand in the standard mix ratio with the quality of the granite stone powder or the like.

Further, the reference mix ratio of the concrete used to produce the concrete pipe pile is:

Cement: gravel: river sand: finely ground sand: water: water reducing agent = 1: 2.0~4.0: 1.0~2.0: 0: 0.25~0.35: 0.01~0.03

And replace 10% to 40% of the cement in the standard mix ratio with the quality of the granite stone powder or the like.

The present invention also provides a production method for the above-mentioned high-strength concrete pipe pile. Put the cement, crushed stone, river sand, ground sand and granite stone powder into the mixer in the above mixing ratio and pre-stir for 30 seconds, then add water and water reducer Stirring is carried out, and after the stirring is completed, the stirring material is evenly layered and continuously poured from one end of the pipe pile mold, then centrifugally formed, and finally cured.

Further, the mixing time of the concrete mixed with granite powder is 240 seconds to 270 seconds.

Further, the time interval from the completion of mixing the concrete mixed with granite stone powder to the completion of pouring into the pipe pile mold shall not exceed 25 minutes.

Further, the interval from the completion of pouring and mold clamping to the start of centrifugal molding should not exceed 15 minutes.

Further, the slump of the concrete mixed with granite stone powder after mixing is 30mm-70mm.

Further, the curing process is 4 hours to 8 hours of normal pressure steam curing at a temperature of 70°C to 90°C and 6 hours to 12 hours of high temperature and high pressure steam curing at a temperature of 170°C to 200°C.

Compared with the prior art, the beneficial effect of the present invention is: mixing granite stone powder in the concrete used to produce concrete pipe piles, not only utilizing the remarkable filling effect, strengthening effect and impermeability of the granite stone powder itself to improve the concrete performance of pipe piles Excellent strength and impermeability, and make full use of waste materials from processing granite stone, reduce the amount of high-grade Portland (ordinary Portland) cement or ground fine sand, save resources, reduce energy consumption, and reduce environmental pollution caused by granite stone powder , has very good economic and social benefits.

Description of drawings

Fig. 1 is the production flow diagram of the high-strength concrete pipe pile mixed with granite powder of the present invention.

Detailed ways

The high-strength concrete pipe pile mixed with granite stone powder of the present invention includes a concrete pipe pile, and the concrete used for producing the concrete pipe pile is mixed with granite stone powder.

In one embodiment of the present invention, the reference mix ratio of the concrete used to produce the concrete pipe pile is:

Cement: gravel: Minjiang river sand: finely ground sand: water: water reducing agent = 0.5~0.7: 2.0~4.0: 1.0~2.0: 0.3~0.5: 0.25~0.4: 0.01~0.03 (base mix ratio A)

And replace 10% to 100% of the finely ground sand in the standard mix ratio A with the same amount of the granite stone powder.

In another embodiment of the present invention, the reference mix ratio of the concrete used to produce the concrete pipe pile is:

Cement: gravel: Minjiang river sand: finely ground sand: water: water reducing agent = 1: 2.0~4.0: 1.0~2.0: 0: 0.25~0.35: 0.01~0.03 (base mix ratio B)

And replace 10% to 40% of the cement in the standard mix ratio B with the same amount of the granite stone powder.

The present invention also provides the production method of the above-mentioned high-strength concrete pipe pile. Put the cement, crushed stone, Minjiang river sand, ground fine sand and granite stone powder into the mixer in the above-mentioned mixing ratio and pre-stir for 30 seconds, then add water and reduce The water agent is stirred, and after the stirring is completed, the stirring material is evenly layered and continuously poured from one end of the pipe pile mold, then centrifugally formed, and finally cured.

In this embodiment, the mixing time of the concrete mixed with granite stone powder is 240 seconds to 270 seconds, which is 60 seconds to 90 seconds longer than that of ordinary concrete.

The time interval from the completion of mixing the concrete mixed with granite stone powder to the completion of pouring into the pipe pile mold is no more than 25 minutes.

From the completion of pouring and mold clamping to the start of centrifugal molding, the interval should not exceed 15 minutes.

The high-speed and medium-speed centrifugal molding time of the concrete mixed with granite stone powder is 1 minute longer than the centrifugal molding time of ordinary concrete, and the centrifugal molding time of low-speed, low-medium-speed and medium-high speed is unchanged, that is, the centrifugal molding time is 180 seconds at low speed , Low and medium speed for 90 seconds, medium speed for 180 seconds, medium and high speed for 90 seconds, and high speed for 360 seconds.

The slump of the concrete mixed with granite stone powder after mixing is 30mm-70mm.

The curing process is 4 hours to 8 hours of normal pressure steam curing at a temperature of 70°C to 90°C and 6 hours to 12 hours of high temperature and high pressure steam curing at a temperature of 170°C to 200°C.

The present invention will be further described below in conjunction with specific examples.

Test raw materials

(1) Cement: Conch brand ordinary Portland cement produced by Taizhou Conch Cement Co., Ltd. was used for the test. The cement model is P.Ⅱ52.5;

1 Chemical composition of cement

2 Performance indicators of cement

(2) Coarse aggregate: The coarse aggregate is taken from the quarry in Fuqing area, and the ordinary stones used in the test are measured according to the relevant regulations of "Pebbles and Crushed Stones for Construction" (GB/T 14685-2001). The density is 2550 kg/m ³ , the bulk density is 1450 kg/m ³ , the needle flake particle content is 8.3%, and the crushing index value is 7%. The particle gradation of the stones is shown in Table 3.

3 Particle Grading of Stones

(3) Fine aggregate: The fine aggregate is made of natural river sand in the Minqing area; the properties of the fine aggregate are determined according to the relevant regulations of "Sand for Construction" (GB/T 14684-2001), and the apparent density is 2500kg /m ³ , the bulk density is 1450 kg/m ³ ; the mud content of the sand is 0.3%; the fineness modulus is 2.8; the average water content of the sand is 5.67%.

4 Grain Grading of Sand

(4) Finely ground sand: The finely ground sand is produced by Fujian Jianhua Pipe Pile Co., Ltd., and its specific indicators are shown in Table 5.

5 Specific indicators of finely ground sand

(5) Granite powder: Granite powder is produced in Lianjiang County, Fujian Province, with a density of 2.768 g/cm ³ and a specific surface area of 588 kg/m ³ . The chemical composition of the granite powder tested by Fujian China Resources (Lianjiang) Cement Co., Ltd. is shown in Table 6.

6 Chemical composition analysis of granite powder

(6) Water-reducing agent: YC-1 naphthalene-based high-efficiency water-reducing agent produced in Yongchun, Fuqing, Fujian. The fluidity of the cement slurry is 220mm, the density is 1.218g/cm ³ , the pH value is 9, and the chloride ion content is 0.14. %, the alkali content is 0.014%, and other performance indicators of the superplasticizer are shown in Table 7.

7 Performance indicators of water reducing agent

(7) Water: The water is taken from the tap water of Fujian Jianhua Pipe Pile Co., Ltd.

Example 1: PHC AB type Ф400×95mm pipe pile with granite stone powder replacing 50% of the finely ground sand, the specific matching is shown in Table 8.

8 Concrete mix ratio

The production method is as follows: put the raw materials of the above mixing ratio into the mixer, the mixing time is 180 seconds, and the measured slump is 40mm. Low speed is 240 seconds, medium speed is 60 seconds, medium and high speed is: 60 seconds, high speed is 300 seconds, and the curing adopts two forms: normal pressure steam curing and high pressure steam curing: normal pressure steam curing: resting for 4 hours—heating for 1.5 hours—constant temperature for 3.25 hours— Cool down for 1 hour; high-pressure steam curing: heat up in the autoclave for 2 hours—keep the temperature for 4 hours—cool down for 3 hours—open the autoclave and stop for 1 hour—the product comes out of the kettle. Results The strength of the concrete test block reached 96MPa, which met the C80 requirements of pipe pile concrete. The appearance quality of the PHC AB type Ф400×95mm pipe pile meets the national standard "Pretensioned Prestressed Concrete Pipe Pile" GB13476-1999, and the effect is good in the test, meeting the design and use requirements.

Example 2: Granite stone powder is used to replace 100% of the ground fine sand PHC AB type Ф500×125mm pipe pile, and the specific mix is shown in Table 9.

9 Concrete mix ratio

The production method is as follows: put the raw materials of the above mixing ratio into the mixer, the mixing time is 180 seconds, and the measured slump is 37mm. After mixing, the mixing material is quickly poured into the pipe pile mold, and then centrifugally formed. The centrifugal time is Low speed for 240 seconds, low and medium speed for 90 seconds, medium speed for 120 seconds, medium and high speed for 90 seconds, and high speed for 300 seconds. The curing adopts two forms: normal pressure steam curing and high pressure steam curing: normal pressure steam curing: static curing 4h—heating 1.5 h—constant temperature for 3.25 hours—cooling for 1 hour; high-pressure steam curing: heating in the autoclave for 2 hours—constant temperature for 4 hours—cooling for 3 hours—open the autoclave and stop for 1 hour—the product is discharged from the autoclave. Results The strength of the concrete test block reached 89MPa, which met the C80 requirements of pipe pile concrete. The appearance quality of the PHC AB type Ф500×125mm pipe pile meets the national standard "Pretensioned Prestressed Concrete Pipe Pile" GB13476-2009, and the effect is good in the test, meeting the design and use requirements.

Example 3: Granite powder is used to replace 20% of the cement PHC AB type Ф500×125mm pipe pile, and the specific mix is shown in Table 10.

10 Concrete mix ratio

The production method is as follows: put the raw materials in the above mixing ratio into the mixer, the mixing time is 180 seconds, and the measured slump is 32mm. Low speed for 240 seconds, low and medium speed for 90 seconds, medium speed for 120 seconds, medium and high speed for 90 seconds, and high speed for 300 seconds. The curing adopts two forms: normal pressure steam curing and high pressure steam curing: normal pressure steam curing: 4 hours of static curing—heating 1.5 h—constant temperature for 3.25 hours—cooling for 1 hour; high-pressure steam curing: heating in the autoclave for 2 hours—constant temperature for 4 hours—cooling for 3 hours—open the autoclave and stop for 1 hour—the product is discharged from the autoclave. Results The strength of the concrete test block reached 92MPa, which met the requirements of C80 for pipe pile concrete. The appearance quality of the PHC AB type Ф500×125mm pipe pile conforms to the national standard "Pretensioned Prestressed Concrete Pipe Pile" GB13476-1999, and the effect is good in the test, meeting the design and use requirements.

The above are the preferred embodiments of the present invention, and all changes made according to the technical solution of the present invention, when the functional effect produced does not exceed the scope of the technical solution of the present invention, all belong to the protection scope of the present invention.

Claims (9)

1. a high-strength concrete tubular pile of mixing granite stone powder comprises concrete tubular pile, it is characterized in that: be mixed with granite stone powder in the concrete for the production of described concrete tubular pile.

2. the high-strength concrete tubular pile of mixing granite stone powder according to claim 1, it is characterized in that: the concrete benchmark proportioning for the production of described concrete tubular pile is:

Cement: rubble: river sand: levigate sand: water: water reducer=0.5 ~ 0.7:2.0 ~ 4.0:1.0 ~ 2.0:0.3 ~ 0.5:0.25 ~ 0.4:0.01 ~ 0.03

And replace in the benchmark proportioning 10%～100% levigate sand with quality such as described granite stone powders.

3. the high-strength concrete tubular pile of mixing granite stone powder according to claim 1, it is characterized in that: the concrete benchmark proportioning for the production of described concrete tubular pile is:

Cement: rubble: river sand: levigate sand: water: water reducer=1:2.0 ~ 4.0:1.0 ~ 2.0:0:0.25 ~ 0.35:0.01 ~ 0.03

And replace in the benchmark proportioning 10%～40% cement with quality such as described granite stone powders.

4. production method as claim 2 or 3 described high-strength concrete tubular piles, it is characterized in that: the cement, rubble, river sand, levigate sand and the granite stone powder that drop into certain proportioning in agitator stirred 30 seconds earlier in advance, add water again with water reducer and stir, after finishing, stirring will stir material from an end even laminating continuous pouring of pipe pile die, centrifugal forming carries out maintenance at last then.

5. the production method of high-strength concrete tubular pile according to claim 4, it is characterized in that: the described concrete churning time of mixing granite stone powder is 240 seconds ~ 270 seconds.

6. the production method of high-strength concrete tubular pile according to claim 4 is characterized in that: stir to finish to watering to described pipe pile die from the described concrete of mixing granite stone powder and finish, the timed interval is no more than 25 minutes.

7. the production method of high-strength concrete tubular pile according to claim 4 is characterized in that: finish to beginning to carry out centrifugal forming from pouring, matched moulds, be no more than 15 minutes pitch time.

8. the production method of high-strength concrete tubular pile according to claim 4 is characterized in that: the slump after the described concrete of mixing granite stone powder stirs is 30mm～70mm.

9. the production method of high-strength concrete tubular pile according to claim 4, it is characterized in that: the process of maintenance is for to carry out 4 hours～8 hours atmospheric steam curing and carrying out 6 hours～12 hours autoclave under 170 ℃～200 ℃ temperature under 70 ℃～90 ℃ temperature.

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