JPS5871116A - Method of preparing kneaded substance by hydraulic substance powdered body such as cement - 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] According to the addition of No. 1, there is provided a method for reducing the amount of breathing water in mixing mortar or ready-mixed concrete using boltland cement or other hydraulic substance powder, and providing excellent strength. The object of the present invention is to provide an improved method by which a molded product can be obtained.

Various types of cement and other hydraulic powders, such as Boltland cement, are indispensable materials in today's civil engineering, construction, and other technical fields. It is commonly and widely adopted regardless of whether it is carried out on-site. By the way, when performing actual construction using this hydraulic substance powder, it is necessary to prepare it as a paste, mortar, or ready-mixed concrete. The amount of water necessary to obtain the desired flow formability is first added to the mixture to adjust the kneading process. Assuming symmetry, W
/C) is added, and the remainder is added in the final process of cross-mixing to adjust the degree of fluidity. However, with such conventional methods, when the kneaded material is used to form the desired molding, a considerable amount of breathing water is generated, and the strength of the molded product obtained is not necessarily satisfactory. It is well known in the field that there are disadvantages and disadvantages such as large variations in the temperature, and in the past, this was considered an unavoidable phenomenon in products made of this type of cement, and a certain amount of breathing time was required. It is said that the composition should be determined and the design and construction should be carried out by taking a sufficient safety factor into consideration.

The inventors of the present invention have spent many years conducting detailed research and practical testing on the adjustment of various contaminants and the production of products using the above-mentioned fine hydraulic substance powder, and have made improvements in these areas. Although we have made many proposals, we have proposed the preparation of a kneaded material using the above-mentioned hydraulic material powder as one of the basic methods for solving the disadvantages and shortcomings of conventional general techniques.

Primary kneading is performed by adding leaf primary water adjusted to form a seven-anicular or capillary region to the hydraulic substance powder to reduce the amount of the powder, and
After this first kneading, we proposed a second kneading process to form a fluid paste by adding the remaining secondary water necessary to form the desired water-cement ratio (Kettle Approval No. 1981). i53974: hereinafter referred to as the original invention).

The present invention has been developed through further practical examination of the above original invention.
During the transition from the above-mentioned primary mixed track to the finishing mixed track (secondary mixed track in the original invention), aggregate of either sand or gravel, or both, was also mixed in according to the regulations in which only the top n11 water was added. It is proposed to undergo a cross-mixing process, whereby the added aggregate functions like a ball in a ball mill in the presence of a relatively small amount of water, including only primary water, and achieves the above-mentioned hydraulic properties. By attempting to grind the material using the same method using powdered material, we were able to achieve a further reduction in the method and succeeded in obtaining a kneaded product with further reduced breathing rate. Note that the term "finish cross-wire" as used in the present invention refers to finish cross-wire in the case of the method of the present invention.

In cases where other additives are further added to the mixed material prepared according to the present invention to obtain a final kneaded material, it is natural that further kneading may be performed after the addition of the additives. .

To further explain the present invention as described above, the inventors of the present invention have studied various methods for preparing paste, which is the basis for preparing a kneaded product using cement, etc., as described above, and have found that It has been discovered that the generation of breathing water can be effectively reduced by significantly reducing the amount of water added during the first crosstalk. The circumstances during this period are as clarified in the nuclear power plant application, and the primary water IIO ~ 4
After the first kneading at 0q6, 40 to 10% of secondary water was added and the second kneading was carried out, and the breathing water ratio was the same as that of the conventional method, with the same water-cement ratio (W/C) and lower collapse. In particular, the primary water should be 15-35% and the secondary water should be 35-15%.
．． The secondary kneading can reduce the breathing rate to at least one-half of that of the conventional method. However, the reason why the breathing rate can be significantly reduced and the strength of the product can be increased cannot generally be confirmed with the naked eye when water is added to powder of a hydraulic material such as cement and kneaded. However, in detail, it is estimated that the occurrence of agglomeration of fine MIJ'it cement powder particles is unavoidable, and in addition, when using the conventional method in which the required amount of water is added at one time and kneaded, the appropriate amount of water is added and kneaded. Because the amount of water is sufficient to form a fluid state, even if kneading is performed for a long time, there is a very small possibility that the cement powder particles will be dispersed once they have formed, and the acid root moisture It is presumed that even if a considerable amount of is present, after the same degree of dispersion occurs, the degree of further dispersion is extremely poor and the flow simply repeats. On the other hand, in the case of primary kneading in a funicular or capillary area where the amount of water is appropriately restricted and a slurry area close to this capillary area, there is a certain amount of space between particles in the slurry area close to the funicular or capillary area. Even if water enters continuously, there is also a considerable amount of air present, and either the funicular F1 state where air exists continuously or at least a continuous aqueous phase where powder particles are interposed between the particles. This state has not yet reached a slurry state showing fluidity due to t
[This shows that even if the powder aggregation conditions due to acid radical hydration are the same, the torque during the kneading operation is much higher, and as a result, a considerable grinding effect can be obtained between the aggregated M lumps. The present invention aims to further increase such grinding effect.

This requires the use of intensive materials such as sand or gravel, which are essential for mortar or ready-mixed concrete; By kneading under low conditions, the impact effect can be increased to the agglomeration circumferential speed, and the #agglomeration term can be reduced.

Of course, kneading may be carried out in a batch manner using a general mixer, but since the present invention involves a multi-stage process, a continuous mixer is required for efficient mixing. It is preferable to adopt In other words, j? tl 8
If a method is adopted in which primary mixing is carried out as in the case of the present invention, this is transferred using a screw mechanism, intermediate mixing is carried out in the middle section, and then final mixing is carried out on the other side, then the mixing is continuous. It is possible to make cross-conductors suitable for obtaining various concrete products according to the current assembly line method. Of course, it is obvious that a plurality of mixers may be used, with the first mixer performing primary kneading, the second mixer performing intermediate mixing, and the third mixer performing final kneading, respectively.

The details of specific examples of the device according to the present invention will be explained below, with appropriate comparisons with the device for use in nuclear power plants described above.

The example was made using ordinary Portland cement and B sand produced in Oi (5 Kakuichi, FM: a09, specific gravity according to JIS A1109 is 26).
30 Ky/Z, water absorption rate is L43, water content is 341%)
The sand-cement ratio (8/C) was varied in the range of 1 to 5, the primary water (wI) was kept constant at 24% of the amount of cement, and then the secondary water (w2) was mixed. Add the second
For the next kneading, the following three methods A, 1 (, C) were adopted (C is cement, W is water, Wl is primary water, w2 is secondary water, S is sand).

■ C + WI - + w2 - + s - + ■ C Juuki → S - + W2 ~ p ■ C Ju wI - + S + W2 - * In other words, all → indicate confusion, and this is due to the 60 seconds of crosstalk time, but overall To make the crosstalk time of
His kneading time was 120 seconds.

As mentioned above, specific formulations in which 8/C is 1 to 5 are as shown in the first group below.

Regarding the secondary water, the amount obtained by subtracting the water amount of W1/C from W/C and the amount of water measured by the amount of water attached to the sand, respectively, was determined.

The above-mentioned ■ is according to the present invention, and ■ and ■ are comparative examples between nuclear power plants, but the above S/C and ■~■
The properties of each mortar obtained by mixing and adjusting in combination with
The breathing rate and the average compressive strength of the molded bodies obtained with these mortars are as shown in the second coating below.

gt((++n1 FT)Cl3, that is, the unit volume weight is summarized separately in FIG. 1, but the cylindrical penetration is summarized in FIG. The S/C is 2° or more for those with S/C of 1 to 3, and the breathing rate is as shown in Figure 3 along with the conventional general compound composition (2) which was added and kneaded at the same time, and according to the present invention. In any case, it was confirmed that the material (3) significantly reduced breathing, and was preferable in terms of strength.

The cylindrical penetration shown in FIG. is penetrated, and the difference between the total weight of the cylindrical object divided by its penetration volume and the apparent specific gravity of the kneaded material is defined as the α value, and α10 is the above value converted when the penetration depth is 10α. This is the α value.

Example 2 Using the same sand and cement as in Example 1, Example 1
Interference occurs according to the method of ■, and the middle 3 as S/C
Assuming that 0 was constant, the following third coating was used, and the surface water content of the sand used was varied.

In other words, the surface water content of sand (8) was varied in 2% increments from 0 (surface dry) to 14%.
Specifically, the surface water percentage was adjusted by using impact force to bring the surface water percentage to a constant state, and then adding and mixing insufficient water to obtain the respective surface water percentage.

The properties of each mortar obtained by kneading by method (1) and the average compressive strength of the resulting molded products are as shown in the following 4th column.

In other words, good results can be obtained even in the case of collapse, but
In particular, it is best to use a material with a surface water content of about 6% in terms of strength, and as for the bleeding rate, the surface water content is 2%.
More favorable reductions were obtained using ~10 inch sand, and these results are summarized separately in FIG.

Example 3 To obtain a mortar with a composition according to the following Table 5, cement, primary water and sand were added, primary kneaded for 90 seconds, and then mixed with violet with a final W/C of 54%. Secondary water (Wl
) was added and second kneading was performed for 90 seconds.

The results of measuring the properties of the obtained mortar and the strength of molded products made from the mortar are as shown in Table 6 below. When the same composition was kneaded using the conventional method, the breathing rate after 3 hours was 5.2.
%, and the compressive strength of the molded product after 7 days is 305 yen, 2
On the 8th, it was 430υ.

Example 4 Ready-mixed concrete with the composition shown in Table 7 below) Wow! ll
l! iuLri. G C is a coarse f4 [-FM a43 ) magnet, and 8/a is the sand to coarse aggregate ratio, and an air entraining agent of sodium salt of resin acid is added in an amount of 002 cm of cement.

Table 7 The following two methods of crosstalk were used:

■ c+w, →S 10G-+W2+Ad→■ C+W,
+S+c-+w2+ Ad→→ is kneading as described above, and the time thereof is 90 seconds, but the mixing time after C+W and +S+G in ① was 120 seconds.

The properties of the fresh concrete obtained and the compressive strength of the molded bodies made of the fresh concrete are shown in Table 8 below.

Table 8 It was confirmed that a product with almost no pleating and excellent strength could be obtained, making it an effective concrete barrel. In addition, when the same composition as the seventh clothing was mixed using the conventional method, the breathing rate after 3 hours was 22%, the compressive strength after 7 days was 220%, and the compressive strength after 28 days was 354. Ta.

(C5) According to the present invention as explained above, when mixing mortar or ready-mixed concrete using powdered hydraulic substances such as cement, the bleeding rate can be sufficiently reduced to shorten the molding finish. This invention can be completed within a certain amount of time and can efficiently produce products with excellent strength, making it a highly effective invention industrially.

4.Additional Relationship The present invention relates to an addition to Patent Application No. 153974 filed in 1982. When adding water to a hydraulic substance powder such as Portland cement to obtain a mixed substance, Primary water adjusted to form a slurry region close to a funicular or capillary state is added to perform primary kneading to reduce the amount of slurry caused by the powder, and after this primary kneading, the target The process of adding the remaining secondary water necessary to form a water-cement ratio and finishing kneading is the same as between nuclear power plants, but in the present invention, 9J4C20
), during the period from the primary mixing process to the final mixing process, aggregates of either sand or gravel or both were also mixed under the conditions where only the primary water was added. By going through the kneading process, breathing water can be further reduced and a product with preferable strength can be obtained, so this is an improvement over the above-mentioned nuclear power plants.

[Brief explanation of drawings]

The drawings show the technical content of the present invention, and Figure 1 is a chart showing the relationship between the S/C and the volumetric weight of the part according to the present invention and between nuclear power plants, and Figure 2 is a diagram showing the relationship between one cylinder and the volumetric weight of the part. S/C
Figure 3 is a diagram showing the relationship between the breathing rate and S/C for σ] according to the present invention and a comparative example, and Figure 4 is a diagram showing the relationship between S/C and S/C in the present invention and comparative example. 3.0, W/C 68%, after first mixing +7) The mortar properties are summarized when the water-cement ratio is 24% and the inlet water ratio of the sand is varied. This is a diagram. ＼Heto Pigeon■Ko-ya=) From 1 Ne-17-ku Page 1 continued 0 Inventor Norio Marushima Ichikawa Kata Hachiman 6-19-7 [Phase] Inventor Mitsutaka Hayayo Inamura Ke, Kamakura City Saki 3-6-47 0 Author Sakae Tazawa - 3-4-10 Wada, Suginami-ku, Tokyo 0 Author Yasunori Matsuoka 1-12-60 Wakabadai, Asahi-ku, Yokohama 0 Author Seiji Kaneko 1688 Fueda, Kamakura City 94-

Claims (5)

[Claims] (1) When adding water to a powder of a hydraulic substance such as cement to obtain a mixed Hvl, add an amount of water adjusted to form a slurry region close to a funicular or capillary state with respect to the hydraulic substance body. Primary water is added to perform primary kneading to reduce the amount due to the powder, and after this primary mixing, the remaining secondary water necessary to form the desired water-cement ratio is added to finish. After mixing, during the transition from the above-mentioned first kneading to final kneading, a kneading process in which one or both aggregates of sand or gravel is also mixed under the condition that only the above-mentioned primary water is added is carried out. A method for preparing a kneaded material using powder of a hydraulic substance such as cement, which is characterized by a hardening effect. (2) A patent for finishing mixing by adding primary water to hydraulic material powder, adding fine aggregate such as sand to the primary kneading paste, performing intermediate kneading, and then adding secondary water. A method for preparing a kneaded material using powder of a hydraulic substance such as cement according to claim 1. (3) Fine aggregate such as sand is added together with hydraulic substance powder and primary water to perform primary kneading, and then secondary water is added to form a finishing mix. A method for preparing a kneaded material using powder of a hydraulic substance such as cement. (4) The cement, etc. according to claim 2, wherein coarse aggregates such as gravel are added together with fine aggregates such as sand to the paste obtained by the first kneading, and the mixture is mixed intermediately. Method for preparing a kneaded product using hydraulic material powder (5) Preparation of a kneaded product using hydraulic substance powder such as cement as set forth in claim 3, in which coarse aggregate such as gravel is added together with fine aggregate such as sand for primary kneading. Method.