JPS5879858A - Manufacture of concrete body - 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 an improved method for producing a concrete body from an aqueous slurry containing at least hydraulic cement, calcium luminate minerals, and V. It is widely used as building materials and civil engineering materials. ◎ One of the manufacturing methods is to manufacture cement concrete bodies that utilize the rapid hardening properties of calcium alkynate minerals. ! 1M! L and hydraulic cement materials &: A method of using an aqueous slurry for molding which is prepared by adding other admixtures to the powder and adding water as required; the slurry ζ; surfactant, protein; A method of using a slurry for lightweight cellular concrete-HE type mixed with aqueous bubbles such as decomposition products and a resin soap.The rapid hardening cement material and the hydraulic cement material are made into di-aqueous slurries separately in advance, and then both slurries are mixed. Method of mixing and using aqueous slurry for molding.

Aqueous slurry for rapidly hardening concrete is produced at a cost of $48 using methods such as using a lightweight aqueous slurry for molding obtained by mixing aqueous bubbles similar to those described above into an aqueous slurry of concrete. If necessary, the slurry may be mixed with oxycarbonate or a soluble salt thereof, or a mixture of these oxycarbonate (salt) and a soluble inorganic carbonate salt. A mixture with the above and mixing to reduce the pot life of the slurry (from a second perspective, the setting time of the aqueous slurry for molding is
The rapidly hardening concrete aqueous slurry prepared in this way is poured into a predetermined snow frame, and after hardening to a predetermined strength, it is removed and then cured at room temperature. , accelerated humidity by steam! The same applies to both ordinary concrete bodies and lightweight cellular concrete bodies, which are cured by either curing or high-temperature, high-pressure steam curing using an autoclave.

The main reason for using calcium aluminate minerals in rapid hardening concrete C is that the strength of the concrete, which is necessary for demolding, can be increased by utilizing the ability of the minerals to accelerate setting and hardening.
This is to cause early expression and early demolding.By this, f! lta'Even concrete products with complex shapes can be produced in large quantities using only a small number of formworks9.
The calcium aluminate mineral, which is a rapid hardening component, is usually enriched with silica sand and limestone, which are added as needed. It is common to use a mixed powder with a drying ratio of 10 to 20% by weight based on the solid content of the system. In the case of concrete products, 40 minutes after slurry 54j11i, the compressive strength of the concrete required for demolding K is 2.5 m or more, or the initial value of 1 octa consistent human resistance value 40 psi or more [1 - 0 rapid hardening that occurs] The strength of the Union's aSU of mixing the components is determined by the balance between The productivity of concrete products decreases due to the delay in shield development.

This is because calcium aluminate-based minerals, which are the most energy-consuming cement in concrete composition systems, are the most energy-intensive.

The price is higher than other hydraulic cements. 1
It is Sabae-like that t can be achieved faster than the initial value tv with a small amount of calcium aluminate minerals.
It is obvious that the present invention is desirable in accordance with these nine requirements.The present invention promotes the initial stiffening during setting and hardening of a concrete body made of a water-injected cement composition mixed with calcium alkalinate-based minerals V. At the same time,
Mixing specific gravity V of calcium aluminate thread mineral to be added
The purpose is to lower the

The present invention is applicable to the case where a rapidly hardening concrete slurry containing calcium aluminate minerals is prepared.

After preparing such a slurry, it is taken out and attached to a mixer, etc., and the slurry is washed with water, and the obtained cement wastewater is mixed as an additive into the aqueous slurry for concrete bottom shapes.Hereinafter, this operation is referred to as "reduction". C) - The discovery that it is possible to have the above two objectives at the same time.

Namely, according to the present invention, (1) cement wastewater containing at least hydraulic cement and calcium aluminate mineral; + (Iv) a slurry obtained by mixing the dry fine powder and water; (V) an aqueous molding slurry rich in at least hydraulic cement and calcium aluminate minerals; and (M) a slurry mixed with the finely ground material and water. A method for producing a concrete body is provided, characterized in that the slurry is reduced to 0 to 20 percent by weight of C2, based on the total cement solids on a solids basis.

Invention C: Cement wastewater as one of the additives is used in the production method of rapid hardening concrete bodies as scissors slurry after making 1111, transferred to storage tank 2, and in some cases mixer, Cement wastewater obtained by washing away slurry adhering to pipes, storage tanks, etc. with a large amount of water, and cement obtained by collecting flowing slurry with a large amount of water from a desensitizing frame placed in the frame. Not to mention wastewater etc.1
The additive used in the present invention is the amount of cement wastewater itself.

The l1lIa slurry obtained by axillary waste water and concentration, the 9 slurry obtained by adding 1% cough mold powder and water obtained by drying Weiso-sludge t'xr, and It is also possible to use a finely ground concrete rod obtained from a water-induced slurry for type IIL, or a slurry obtained by mixing pulverized and mold-killing material with water. And, to my friend, I will show you the dimensions of the 4IkHL type of solidified and hardened pouring slurry for this molded and finely pulverized product! ! Also included are the shavings produced when IdIJ is cut into 1111, and the pulverized porridge produced during transportation of the molded product after curing.

In addition, the above-mentioned finely pulverized material is shavings, shavings, etc. Because there are granular and block-like materials of considerable size,
It is preferable to use a ball mill etc. (preferably a wet grinding method).The characteristics of these wastewater such as cement wastewater are as follows.
Like a slurry state, etc. (= even if left in a state where water is present, it will remain in a slurry state, etc.). Surprisingly, when two or more of these are reduced in small amounts to a rapidly hardening water-based slurry for molded objects, the development of the initial strength of the rapidly hardening slurry is significantly promoted. It also exhibits the effect of reducing the amount of addition of harvested duck.On the other hand, the effect of promoting the initial strength development of the knitted material is n&
If 4 hours and 11 hours have passed since you obtained the material, or if there is no difference even if it has been left for more than a week, the present invention (reducing the solid content of concrete slurry with additives in 2) As a standard, it should be added so that the solid content of #1 filler accounts for 2.0 to 20 weight units (preferably 3 to 18 weight units) of the total cement content of the final aqueous slurry for molding. .

If the amount of the additive is less than 2% by weight, the initial strength promoting effect is poor, and if it exceeds 20% by weight, the initial strength promoting effect is sufficiently enhanced, but the strength of the molded product after curing increases. - This is because the desired effect of the present invention cannot be obtained due to a significant decrease in the temperature. Furthermore, if the additive contains a bubble component tl#, the bubbles will be removed as much as possible.
It has become possible to reduce the amount of calcium aluminate minerals in the aqueous concrete slurry for L-type concrete to a total cement composition of about 10 weight to about 4 weight, and it can be compared with the original rapidly hardening concrete slurry to IIQIm or more. The calcium aluminate mineral, which exhibits initial strength development and exhibits an extremely large economical effect, and which is a rapidly hardening component in the present invention, is aluminum cement, 3CaO-alρ.

Ca0IAlρm, 12L:mO-7Alρ, ,
Cm0-2AI, 0. .

or %U) in which a halogen element system was bathed in the same bath.

or a mixture of these minerals, a mixture of these minerals and an inorganic sulfate, or a co-fired product of this mixture.50Next, the hydraulic cement (material) referred to in the present invention is ordinary Portland cement.

It refers to slag cement, silica cement, crya cement, etc., but depending on the case, cementitious materials made by adding silica sand, lime, gypsum, etc. to these cements are also used. % Cm(OH), when preparing a rapid hardening cement by blending the components.

It is possible to increase the initial strength after setting by appropriately adding CaO, CaCυ, MgCU, etc. to 6 m, but if the additives are reduced according to the present invention, the use of these is no longer necessary and is complicated. The structure of the present invention described in detail above can also be applied to lightweight cellular concrete using aqueous foam. For aqueous bubbles, anionic surfactants such as protein decomposition products, pine tar soap, alkylaryl sulfone-coated sodium or ammonium salts, and polyoxyethylene alkylaryl sulfate salts are used as foaming agents. can be used.

In addition, in order to improve the stability of 1 gA foam, commonly used water-soluble polymeric substances, such as various cellulose derivatives, polyvinyl alcohol, etc., are used depending on the case.

These foaming agents are added to water and made into aqueous foam by forced stirring or pressurized nitrogen blowing.
It is necessary to prepare in advance materials from the above-mentioned 9 desired groups and kill them. Among the additives, the amount of solids in cement wastewater and slurry is determined by the commonly adopted method, namely:
Drying a small amount of additive to find the solid content 1, or calculating the specific gravity of the additive and the solid content lI Healthy horizontal wrinkles and dying to get the specific gravity of the additive to 1: #ll'ji! What to do C Uni 1 Ill'1i using methods to know about solid content concentration! I do.

Hot water volume: 1a When talking about air bubbles for foam concrete, the 011iya type device that removes and measures the air bubbles is 25 to 45 jolls because it has good waterfall S properties.
The method of adding additives in the case of lightweight cellular concrete body molding is as follows: 1 = Adding additives in the i rally of hydraulic cement materials; There is a method in which the aqueous bubbles are then mixed with urine and vomit slurry as a rapid hardening I component, or a method in which additives are added after preparing a rapid hardening lightweight concrete slurry for molding, and the mixture is stirred and heated to homogenize it. However, these methods do not limit the present invention in any way.

However, the method of slowly mixing the rapidly hardening component and the additive is not preferred and should be avoided.

Thus obtained hemp concrete slather IJ-
? Place it in the formwork I' and remove it with a hardening machine.

By curing, a concrete body product is obtained.

The invention will now be explained by way of example.

Comparative Example 1 Portland cement 244.6u, fine silica sand 16i,
akJ, calcium hydroxide 9.3 to 9. 1.4 # of sodium citrate and 191.1 kJl of water Mixer 1: Add, stir and warm to make an aqueous slurry of hydraulic cement v*1
Next, pressurized air was blown into the foaming agent-like bath solution containing proteolytic foaming agent ("Glufoam" manufactured by Sun Orient Corporation) to give a volume of 20 foams. 598 aqueous bubbles! ! After pouring water into the cement material slurry and uniformly combining it with the cement material slurry, an aqueous slurry of a rapid hardening component made by mixing alumina cement (46.34) and water (32.4) was added. The mixture was poured into a container and mixed uniformly to form a rapidly hardening lightweight cellular concrete slurry V Yuyu with a slurry specific gravity of 0.718.

Use this prepared slurry! Specimen mounting frame 6 for la standard use
The acid m1lli of the cement slurry was poured into two layers, and the slurry was poured into multiple layers of water to prepare the additive of the present invention. MU after conversion, 1'i'MC
Broctor penetration resistance 4IIL4I according to 403 method:
#M was determined and used as an index of initial strength development. I
Button t's; itmc is shown. Father, the proboscis sub-regular sample library is Note I.
After 50 minutes of irradiation, it was dewormed and cured for 8Q at 180°C, and then its dry specific gravity was 0.50.
, 60 sounds) Leave to dry at LH.

Using a universal tensile tester, crosshead speed 0, 5
Side footed at m/min. As a result, the additive containing a large amount of water is left undisturbed for 2 days to allow the solid content to settle. The scum and supernatant liquid were removed, and the solid content was reduced to 33% by weight, 1114111. , used for slurry preparation of the additive reduction system in the following examples. Preparation of aerated concrete slurry with a composition that takes a long time. That is, Portland cement 231.1
9. Fine silica sand 153.8 IC#, slaked lime 8.8 yen, and sodium citrate 1.9! ! , and 145.4# of water were put into a mixer and mixed uniformly to form an aqueous slurry of hydraulic cement material. After that, add the above additives to, z
Then, in the same manner as in Comparative Example 1, aqueous foaming and aqueous slurry of alumina cement were added and mixed uniformly, to prepare a rapidly hardening lightweight cellular concrete slurry.

The initial strength development properties of this slurry after coagulation and the physical properties after autoclave curing are shown in Figure 111 and Table 111. Example 3 Ratio II! In the cement composition system of No. 111, the addition of aluminum cement, which is a rapidly hardening acid content, was reduced by 50%,
Lightweight aerated concrete slurry with a composition such that the additive solid fraction base becomes 10 weight spits (0 (i.e., Portland cement) 2311#, Mold@i! ? 1518kl,
Slaked lime 8.8kl, /zonic acid noda λ8-% and water 1
After adding 14.6111 to the cement cement and slurrying it, the additive 14G and 4111 t were heated.After that, the same amount of aqueous bubbles as in Comparative Example 1 was introduced into the slurry C, and the slurry C was made into an aluminum cement. Al2 consisting of 23.2KII and water 16.2-
The concrete slurry was poured into the container, and the slurry was fed with *-tstA to obtain a rapidly hardening aerated concrete slurry.

The physical properties were measured as described in 911. The results are shown in Figure t'1ll1 and Table 111.

Example 3 In the cement composition of Example 1, the rapidly hardening alkaline cement was reduced by 60% by weight, and a lightweight aerated concrete slurry v#IIIl was made with a composition such that the additive solid fraction was 18% by weight. . That is, Portland cement 21
2.2. At the same time as in Comparative Example 1, 1413111° of fine powder silica sand, 7.9° of slaked lime, 2.9# of sodium citrate, 42-6-1 of water, and 252.71C# of additives were put into the mixer and forcibly stirred. of aqueous fi foam was introduced, and further, an aluminium cement slurry consisting of 18.5 g of alumina cement and 13.0 g of water was added, mixed uniformly, and a lightweight cellular concrete was obtained. .

Physical property tests were conducted as described in Comparative Example 1. As a result, in the cement composition of 〇 Comparative Confucian Ratio I21111 shown in Figure t'al1 and Table 111, the ratio of Al2 Nacement was changed to 1.6% by weight and the additive solid content was changed to 1.6% by weight to make lightweight aerated concrete slurry VT14. 9c1 i.e. Portland Semen) 2121! k1% mold silica sand 14
1.31 #, slaked lime 9.3 #, sodium citrate L4, water 173.6111, and additives 20.0 #v (stir to homogenize with lifeener, and after eating, add light air bubbles using the same method as Comparative Example 1. Got concrete.

Physical property tests were conducted as described in Example 1.

As a result, val 1 diagram and 111 table 6 = show ◎ ratio WaS In the cement composition of Example 3, the additive amount original ratio car was 22
Salivary bubble contact → was obtained using the method of Example 3 and tIilIl except that the weight was chewed.
201.0kl, mold powder silicon #133e+@, slaked stone X7.4
11. Water s, om, additive 308.8-1 and citric acid nome 30 mv? The mixture was poured into a shaker and homogenized by forcible stirring, and then subjected to a physical property test as described in Example 3. The results are shown in Figure t-III and Table 111. .

As is clear from Wi1 Table StS, in Examples 1 to 3, Comparative Example 1
On the other hand, as is clear from Table 111,
In Comparative Example 3, as in the other examples, sufficient final strength fIl
Example 4 Obtained from Comparative Example 1 In Examples 1 to 3, in which good properties were not obtained, sufficient initial strength and final strength were obtained. 11S1/A lightweight cellular concrete slurry having the same solid content as in Example 2 was prepared except that it was dried and pulverized in a ball mill to form an additive.

This slurry showed slurry 111111 10 tater values of 2 gpsi and 44 psiv after 20 minutes and 30 minutes, respectively.Example! A cement body was molded in the same manner as in Comparative Example 1 except that no aqueous bubbles were used (Comparative Example 4).

After taking out this cement slurry, rinse off the deposits with a large amount of water and stir slowly day and night in a storage tank to obtain cement wastewater with a solid content of 9.5% by weight.
A hardening cement slurry having exactly the same solid content ratio as in Example 1 was prepared except that aqueous bubbles were added. After 1130 minutes of slurry preparation, the pro/me development property was 2.2 times stronger than that of Comparative Example 4. The mixture was pulverized using a ball grinder and used as an additive. This V implementation cost $115 and I got an aqueous slurry for molding with the same solid content Kitamoto at the beginning! i! Iff expression is 5J! It was confirmed that there was no difference in the values as in Example 5 even if the main additive was cement wastewater or dry powder of slurry.

[Brief explanation of the drawing]

1111fjA is a diagram showing the initial strength development rate of concrete bodies prepared using examples of the present invention and comparative samples as Broctor Masato resistance values versus elapsed time after preparation of aqueous slurry for forming. Stock company registration application representative Patent attorney Akira Aoki Patent attorney Kazuyuki Nishi 1) Male patent attorney Akira Yamaguchi

Claims (1)

[Claims] 1. (i) Cement wastewater enriched with at least four hydraulic cements and calcium aluminate minerals. (2)) Thick filth from the wastewater. −) Dry fine powder of concentrated filth. (M - A sewage mixture of dry fine powder and water. ) - at least 1% additive selected from the group consisting of sewage mixed with crushed mold and water, for molding containing at least hydraulic cement and calcium alkenate minerals as main components Edible cement) m based on one portion of water-based slurry
ζ to be 2.0-20% by weight for 8 minutes
By adding 2 vIII images. Method of manufacturing concrete bodies. Claim 1: A method of mixing an aqueous molding slurry to which the additives have been added and foam for lightweight cellular concrete.
3. The additive is used after removing as much air bubbles as possible for lightweight cellular concrete. 111111
Manufacturing method of concrete body described in section or IN2 section @