JPS59202810A - Manufacture of extra-high strength concrete pile - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] The present invention relates to a method for manufacturing ultra-high strength concrete piles.

Conventional Conch'J-1 piles have a compressive strength of 1,000
9/cri cell absorption limit, and it can be produced by autoclaving or by adding a high-strength admixture containing insoluble anhydrite as a main component and steam curing at normal pressure. There is. On the other hand, as the need for countermeasures against 111-ton earthquakes has come into focus, there is a demand for ultra-high-strength concrete piles that use even higher-strength concrete and have a greater amount of introduced prestress.

The inventor of the present invention has further studied how to increase the strength of concrete, and found that it is possible to easily achieve a weight of 1,200 kg/1,200 kg/kg by adding appropriate amounts of ultrafine powder and a low water-to-cement ratio.
The present invention was completed based on the discovery that this material exhibits a strength of 1 or more, and that when applied to the production of concrete piles, a product with extremely high durability can be obtained.

That is, the present invention provides 100 parts by weight of cement, at least one of calcium sulfate anhydride or trihydrate.
20 parts by weight, at least 5 pieces of ultrafine powder with an average particle size of 1μ or less
0 parts by weight.

High performance water reducing agent, at most 1 ON, and Mohs hardness of 6 or higher or Noog indenter hardness K 7 o kg/1+11
The present invention is characterized in that a desired amount of negative aggregate selected according to the criteria of 112 or more is mixed to prepare a contaminant with a water-cement ratio of 0.25 or less, and this material is produced after molding.

The present invention will be explained in detail below.

First, the crosstalk material conveniently used in the present invention will be explained.
The use of at least one anhydride or dihydrate of sulfuric acid, preferably insoluble anhydrite, is necessary to increase the strength of concrete and is known per se. Therefore, commercially available high-strength admixtures containing as ingredients, such as Denki Kagaku Kogyo Co., Ltd.'s trade name [-Tenryoku Sigma 100OJ, Nippon Cement Co., Ltd.'s trade name "Asano Super Mix", Showa Mining Co., Ltd. ) Product name ``Daimixyo'' etc. can also be used.The amount of this component added is 1 to 20 parts by weight per 100 parts by weight of cement.If it is less than 1 part by weight, it will cause ultra-high strength with significantly increased durability. It is not possible to manufacture concrete piles, and even if more than 20 parts by weight is mixed, a high effect cannot be obtained.In the present invention, in order to further increase the durability effect, an appropriate amount of ultrafine powder is added. It is characterized by the use of a large amount of high-performance water reducing agent and hard aggregate, and the use of a mixed material with a water-to-cement ratio of 0.25 or less.

The ultrafine powder is a powder with an average particle size of 1 μm or less, and there are no particular restrictions on its composition, but those that are easily soluble in water are not suitable. In the present invention, silicon or silicon-containing alloy or zirconia'f:
Silica dust (silica fume) and siliceous dust, which are by-products during production, are particularly suitable, and fly ash, calcium carbonate, silica gel, opalescent sandstone, 2M titanium, aluminum oxide, etc. can also be used. The amount of ultrafine powder used is 50 parts by weight or less, preferably 2 to 40 parts by weight, per 100 parts by weight of cement. If it exceeds 50 parts by weight, the fluidity of the kneaded product will be markedly reduced, making it difficult to mold and developing insufficient strength.

As cement, ordinary, early strength, ultra early strength, or white Portland cement is generally used. Furthermore, it is also possible to introduce chemical prestress and compensate for shrinkage using expanded cementola, and to develop the required strength in a short time with steep cement.

A high-performance water reducing agent is a surfactant that has a high dispersion ability even when added to cement in large amounts without causing excessive setting or excessive air entrainment. Salts, salts of naphthalene sulfonic acid pol-aldehyde condensates, high molecular weight trigenine sulfonates, polycarboxylate salts, etc. are used as main ingredients.

The standard usage amount of high performance water reducing agent is 0.3 for cement.
1% by weight, but in the present invention, it is desirable to add a larger amount. In the present invention, cement 100
Although it was limited to at most 10 parts by weight for heavy hr parts,
The preferred amount used is 2 to 5 parts by weight. High performance water reducers are essential to obtain mixed materials with low water-to-cement ratios6.
! 7. If the amount of I is more than 0 parts by weight, the water-reducing effect will not be accompanied by an increase in the amount added, and on the contrary, it will have an adverse effect on curing.

The aggregate should be harder than that conventionally used for preparing sea crotch comfrey, with a Mohs hardness of 6 or more, preferably 7 or more, or a Knoop indenter w degree of 700.
Use one that has been excursed under any of the criteria of kg/cn1 or more.

An example of something that satisfies this criterion is sandstone.

Pyrite, hematite, magnetite, yellow jade, and lawsonite.

Corundum, phenacite, spinel, beryl, gold curb, tourmaline, granite, andalusite, cross stone, zircon, calcined bauxite, boron carbide.

Examples include tungsten carbide, ferrosilicon nitride, silicon nitride, fused silica, fused magnetite, and silicon carbide. Among these, nitrides and the like are particularly preferred because they have high strength and excellent abrasion resistance because they react with alkali to increase the adhesive strength at the interface between concrete and aggregate. Examples of this include ferrosilicon nitride, silicon nitride, and electrofused magnetic metal.

The reason why the criteria for selecting aggregates in the present invention is set as W as described above is as follows. In the concrete pile of the present invention, the matrix portion is composed of a cement water feature, and the matrix strength has significantly high physical properties under the conditions of the present invention. However, concrete piles
Or, if we look at it as a composite of mortar etc. and aggregate, the fracture will occur from the weak parts, so if stress concentration is taken into consideration, conventional bone removal cannot take advantage of the matrix strength of the present invention, and the aggregate Partial destruction occurs. Therefore, in order to easily achieve the favorable compressive strength required for ultra-high strength concrete piles, that is, 1200 kg/crj or more, preferably 2 ooo'g or more,
Recognizing that not only the matrix strength but also the strength of the aggregate is important, the above-mentioned criteria, i.e., Mohs hardness of 6 or more or Knoop indenter hardness of 700 kV or more' (! - those that satisfy In the present invention, even if aggregates that do not meet the above criteria are used, ultra-high strength concrete piles cannot be manufactured.

The Knoop indenter hardness referred to here refers to the hardness of a diamond square pyramid with diagonal angles of 170°30' and 1300°, which is used to measure the hardness of non-metallic materials such as minerals, glass, and abrasives, as well as micro-Vickers hardness. It is micro-indentation hardness measured using an indenter. The load when making a diamond-shaped indentation on the test surface is pkg (r, the length of the longer diagonal of the water inlet is 1 mm, and the quotient is divided by the projected area of the indentation, which is expressed as Knoop indenter hardness 11Hk, as follows: Calculate using the formula.

Hk = A7cot]/2 (170°30')・j
an'/2 (130°) 1= 14', 23p/l"
(kg/1rvn2) or more materials are mixed to adjust the crosstalk, but the amount of water at that time is 0.25 in terms of water-cement ratio.
Below, it is preferably 0.15 to 0.20. 0.25
With a large amount of water, even if the above-mentioned material according to the present invention is used, it is not possible to obtain a strength of only about 1,000 kg/.

Next, to explain the shaping and curing of the kneaded material, in order to form the kneaded material into piles, centrifugal force forming method, vibration centrifugal force forming method,
Roll compression molding method.

Spraying can be performed by a coloring method or a combination of these methods.

Curing after molding is n' temperature curing and normal pressure steam curing.

Any of the high temperature and high pressure curing methods can be used, and if necessary, a combination of these curing methods can be used to produce the product.

As explained above, the present invention uses ultrafine powder, calcium sulfate (anhydrous and/or dihydrate), a specific amount of a high performance water reducer in cement, and furthermore uses hard aggregate. According to the invention, the kneaded material with a low water-cement ratio is adjusted and formed into a pile.According to the invention, it is an ultra-high strength cock that has a large allowable compression stress and has a high introduction prestress kTk.
-1- It is possible to manufacture piles.

A more detailed explanation will be given below with reference to examples.

Example The following materials were mixed 15 times as shown in the table, and mortar or concrete was completely prepared.

Thereafter, it was molded into a test piece of φ10CTL x 20cIrL using the vibration method, and pre-cured for 6 hours at 75°C.
The temperature was increased by shaking at a rate of 18°C/h) and held for 4 hours.
After that, it was left to cool naturally. The next day, the mold was removed and the compressive strength was measured.

The results are shown in the table.

Next, prepare a kneaded material with the same composition as in Experiment No. 1 to 15,
The piles were formed using the vibratory centrifugal method.

The dimensions of the molded product were φ30Cr/L x 5m, and a preten/con system was used, and the effective prestress amount was 1/3 of the test piece strength. Then, the same curing as above was carried out, and 12
After curing with water for days, the bending strength (first crack) of the piles was measured. The results are also listed in the table.

Furthermore, A No. 1 to 4 and 12 are comparative examples, and the others are examples of the present invention.

<Materials used> Cement: Denki Kagaku Kogyo Co., Ltd. Ordinary Portland cement Insoluble anhydrite: By-product of fluoric acid generation (B-V-
75350-Tsu) ・Ultrafine powder・Norica dust from the production of ferrosilicon (average particle size 0.1 μ)・High performance water reducing agent・Denki Kagaku Kogyo Co., Ltd. whose main component is salt of alkylnaphthalene sulfonic acid formaldehyde condensate ) Product name UFT 500J ・Bone river sand... 5rrrIn bottom Mohs hard #5-5.5 produced for Sagami
River gravel/Sagami grade maximum dimension 13+nrn Mohs hardness 5~
55 Silica sand - 5m below Mohs hardness 7 Sand stone...Maximum method] 3 Mohs hardness 7 Corundum sand...5mm below Mohs hardness 9 Corundum stone...Maximum method 131 Mohs G9 Water...Tap water As shown in the above beauty, experiment Nos. 5 to 11 in which the kneaded materials were adjusted within the scope of the present invention. and 13-15,
After molding and curing, it stably showed bending force of 400 kg/・ or more, and the experiment No.
, 14 and 15, piles with significantly high bending strength were obtained.

Patent Applicant: Denki Kagaku Kogyo Co., Ltd. Procedural Amendment Written on June 9, 1982 Director-General of the Patent Office Kazuo Wakasugi 1, Indication of Case 1982 Patent Application No. 79084 2, Title of Invention: Ultra High Strength Concrete Pile manufacturing method 3, relationship with the amended person case Patent applicant address 1-4-1 Yurakucho, Chiyoda-ku, Tokyo Name (329) Column 5 of the detailed description of the invention in the Denki Kagaku Kogyo Co., Ltd. specification , on page 2, line 17 of the statement of contents of the amendment, replace "at least" with "at most"
I am corrected.

Procedural amendment June 20, 1981 Kazuo Wakasugi, Commissioner of the Patent Office1, Indication of the case, Patent Application No. 79084 of 19882, Name of invention Process for manufacturing ultra-high strength concrete piles 6, Person making the amendment Case Relationship with Patent Applicant Address 1-4-1 Yurakucho, Chiyoda-ku, Tokyo Claims column and Detailed Description of the Invention column 5 of the specification, Contents of amendment 1) Page 1, line 4 of the specification Item “Scope of Claim for Utility Model Registration”
amended to read "Claims".

2) On page 7, lines 7-8 of the specification, add "Piles with concrete or mortar, etc." to "One pile with matrix" and "Added in terms of active ingredients."

6. Attached documents First page of the corrected specification There are no corrections other than those in 5-1).

Description 1 Title of the invention Method for manufacturing ultra-high strength concrete piles 2 Claims 100 parts by weight of cement, 1 to 20 parts by weight of at least one of calcium sulfate anhydride or dihydrate, average particle size Diameter 1
At most 50 parts by weight of ultrafine powder of μ or less, at most 10 parts by weight of a high-performance water reducer, and any hard aggregate selected on the basis of a Mohs hardness of 6 or more or a Knoop indenter hardness of 700/'g/mmz or more. Mix the amounts to make the water-cement ratio 0.
．． A method for producing an ultra-high-strength concrete pile, which comprises preparing a kneaded material of 25 or less, and curing it after forming.

Detailed description of the invention The present invention relates to a method for manufacturing ultra-high strength concrete piles.

Claims (1)

[Claims] 100 parts by weight of cement, 1 to 20 parts by weight of at least one of calcium sulfate anhydride or trihydrate, at most 50 parts by weight of ultrafine powder with an average particle size of 1 μ or less, and at most 10 parts by weight of a high-performance water reducer. ．． lr quantity and Mohs hardness 6 or more or Nuzo indenter reflection ``70''/1rrrr? By blending the hard 'f'L''tjf' selected according to the above criteria, a kneaded material with a water/1 ratio of 0.25 or less is prepared, and this is cured after molding.Characteristics A manufacturing method for ultra-high strength concrete piles.