JPH072330B2 - How to add admixtures for concrete - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method for adding an admixture material for concrete.

<< Conventional Technology >> Currently, admixtures are mixed in these concrete materials for the purpose of improving workability and durability, instead of kneading only cement, aggregate, and water to produce fresh concrete.

<Problems to be solved by the invention> However, among these admixtures, the specific gravity of the admixture itself is low, it has no affinity with the concrete material, and it separates when left for a long time, and easily gels due to aging. , There are also admixtures that adversely affect concrete materials.

As a material that can be easily separated, for example, an aluminum powder-mixed dispersant of the expansion agents is used. In addition, examples of the material that easily gels include thickeners containing cellulose ether as a main component, special admixtures in water, and breathing inhibitors.

In addition, as a method of adding these admixtures, the admixtures are dispersed or dissolved in water to form a solution and placed in a mixer such as a concrete mixer truck in this state. However, when added in a solution state, it is difficult to uniformly disperse and mix in the concrete material, and long-term kneading is required. Furthermore, if the material is left for a long time due to construction, the gelation as described above is likely to occur.

Further, in this charging method, since the addition amount of the admixture material with respect to the concrete material is determined, it is necessary to measure with a graduated cylinder or the like, and the measuring and charging are troublesome.

The present invention has been made in view of the above problems,
The purpose of the present invention is to prevent the mixing and mixing of the admixture with respect to the concrete material and to prevent gelation, to uniformly mix and disperse in the concrete material, and to save the trouble of measuring and charging.

<< Means for Solving the Problems >> In order to achieve the above object, in the method of the present invention, a method of dispersing and mixing an admixture such as an admixture or an admixture in a concrete material during concrete kneading Is formed into blocks having a size that can be measured by freezing, and the blocks are put into a mixer truck together with a concrete material so as to be mixed and dispersed.

<< Action >> By freezing the admixture, it can be divided into blocks of a size that can be weighed according to the number of the admixtures, so that it is possible to determine how many concrete materials to put in according to the amount of the concrete material, and thus the labor of weighing can be saved.

And unlike the solution, the blocks of frozen admixtures that have been added are mixed and dispersed in each block unit in the mixer of the mixer truck, so there is no uneven distribution of admixtures and a uniform mixing and dispersion effect is obtained. To be

In addition, when the admixture has a property that loses its efficacy over time, the blocks of the admixture separately dispersed individually melt gradually with the passage of time, and therefore, for example, in a concrete mixer truck together with the concrete material. Even if there is a time lag between putting the blocks of the admixture and transporting them to the concrete pouring target position, the transport time can be earned by the time delay due to the melting of the blocks of the admixture.

<< Embodiment >> An embodiment of the method of the present invention will be described in detail below with reference to the drawings.

The drawings are process explanatory views showing a method of adding an admixture according to the present invention.

First, as a method for producing the admixture A, for example, the admixture is dispersed or dissolved in water and placed in an ice tray divided into predetermined blocks, such as an ice tray, in the freezer compartment 1. When frozen, the admixture freezes.

In the frozen state, this is removed from the ice tray and stored in the cold storage chamber 2. The frozen admixture is formed into blocks having a predetermined shape according to the partition of the ice tray. The unit of this block is set so as to have a size that can be measured depending on the number. Such conditions can be achieved by making the size of the block 2 cm square or more, preferably about 4.7 cm square, about 5.9 cm, so that the weight of the block is 100 g, 200 g, 500 g, etc. It is better to make it about 8 cm square.

The block of the admixture material A that has been frozen and stored in the cold storage chamber 2 is weighed by the weighing device 3 according to the ratio to the concrete material 6 when it is loaded into the concrete mixer truck 5, and along with the concrete material 6 travels through the chute 4 and the concrete mixer. Car 5 concrete mixer 5a
It is thrown in.

In this state, the concrete mixer truck 5 moves to the concrete placing site 7 while rotating the concrete mixer 5a. It should be noted that the blocks of the admixture material A charged into the concrete mixer 5a are separated and come into contact with the concrete material in each block unit. Therefore, for example, even if the addition amount to the concrete material is small, it is uniformly mixed into the concrete material rather than being poured into the concrete mixer 5a in a solution state. At this time, the block of the concrete material 6 and the frozen admixture material A is a concrete mixer truck.
Although it will be dispersed and mixed sequentially by the rotation of 5a, it will be mixed in a state of being slower by the melting time h than the mixing of the other concrete materials 6, that is, the cement, the aggregate and the water.

For example, if the transport time of the concrete mixer truck 5 to the concrete placing site 7 is H and the melting time of the frozen block of the admixture A is h, the time when the admixture A is actually mixed and dispersed is H-h, and the time The delay can delay the timing, for example, if the material is a material that easily changes the quality of concrete. The present invention can also be applied to admixtures such as superplasticizers and water reducing agents.

<Effects of the Invention> As described in detail in the above examples, in the method of adding the admixture material for concrete according to the present invention, the admixture material that is easy to separate can be made uniform, and the admixture material that easily gels can be frozen. By doing so, it can be mixed into concrete without gelation. Further, as compared with the conventional method of adding in a solution state, since the time from the mixing of the admixture material of the frozen block to the concrete material to the pouring time can be shortened, for example, an admixture material that is likely to deteriorate in quality due to aging. Even in this case, the change with time can be earned for the melting time. In addition, since the admixture that is put into the concrete material comes into contact with the concrete material in every multiple blocks, it is possible to have a more uniform mixing and dispersion effect compared to when putting it in a solution state, as well as weighing and concrete mixers. The charging method can be easily performed, and since the freezing method can be performed in a general freezer, there are various advantages such as no special device is required.

[Brief description of drawings]

FIG. 1 is a process explanatory view showing a method of adding an admixture material for concrete according to the present invention. 1 ... Freezer room, 2 ... Cold room, 3 ... Measuring device, 4 ... Chute, 5 ... Concrete mixer truck, 5a ... Concrete mixer, 6 ... Concrete material, 7 ... Concrete placing site, A ... Admixture

Claims (1)

[Claims] 1. A method of dispersing and mixing an admixture such as an admixture or an admixture in a concrete material when kneading concrete, wherein the admixture has a size that can be measured by the number of pieces by freezing. A method for charging an admixture material for concrete, characterized in that the admixture material is formed into a block and is put into a mixer truck together with the concrete material so as to be mixed and dispersed.