JPS58223652A - Non-shrinkable high fluidity high strength mortar - 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 non-shrinking, high flow, high strength mortar.

Premix type non-shrinkable high-flow high-strength mortar (hereinafter referred to as "non-shrinkable high-flow high-strength mortar") is used to fill the joints of buildings and structures to integrate the structures.

(abbreviated as high-strength mortar) is used.

Conventional prefabricated buildings, particularly prefabricated reinforced concrete structures, are integrated at joints using reinforcing bars or steel frames between the structural components using a fixing method based on the standards of the Architectural Institute of Japan.

However, with this method, the shape and dimensions of the joint become larger.
It is difficult to apply such a joining method when the part is small.

To solve this problem, we use a filling part made of an inorganic material that has extremely high fluidity, high strength, and is non-shrinkable.

There has been a need for a method that allows integration even when the joint part is small.

The filling section used for this purpose needs to have fluidity that is optimal for workability (fillability), minimal monthly separation, and non-shrinkage.

Furthermore, the mortar must have a high adhesion strength between the concrete 1 and the reinforcing bars in the filled part.

When considering conventional high-strength mortar from the above perspective, it can be seen that the grout material mixed with Portland cement has a large effect on all properties.

That is, commercially available grouting has a flow value of about 270 mm, which is a low fluidity, and separation is likely to occur.

Commercially available grout +i had a low I-2 flow value of about 200 at 74 minutes after being mixed with cement.
．． Furthermore, liquidity will be lost.

Yes, the conventional commercially available grout has a compressive strength of 600 Kq/a on the 28th of September. r is small and the strength is insufficient by 2.

The present invention has been made in order to eliminate the conventional drawbacks as described below, and has the following objectives: (1) To provide a high-strength mortar that is non-shrinkable, has high fluidity, and has high compressive strength. ing.

In order to achieve the object of the present invention, various experiments were repeated and the following results were obtained.

Although non-shrinkability can be improved by adding an expansion material, the compressive strength tends to decrease when commercially available expansion materials are used.

In particular, this tendency becomes more pronounced when C8A-based expansion resin is used.

Therefore, in the present invention, 1.1 lime-based special expansion material is used to ensure non-shrinkage property and 1. Decrease in compressive strength □ 1 () January 1 and 2.

Here, lime-based special expansion interest refers to free Oa, 015-6
Q jTj, 'j'? f section' free caF 25-30 weight la-%, j10aO・7At203・CaF2 filtration O
Chestnut 7 force crushed product containing ~80% by weight and other components 10% by weight or less, free CaO 15-60% by weight, free Ca, F2 5-0% by weight + 1'l
CaOH7At203 ・CaF2ro O~80 weight counter,
It consists of a mixture of tarinka seven gypsum containing 10% by weight or less of other components, and 0% contained in the mixed pulverized product.
The weight ratio of aSO4/At203 is in the range of 1.0 to 3.5.

High fluidity can be obtained by adding a high performance water reducing agent, but the combination of this high performance water reducing agent and expansion ratio is compatible, and commercially available expansion ratios (especially C8A type) and polyalkylaryl When combined with a sulfonic acid jjA type high performance water reducing agent, there is a remarkable tendency for the strength to be lower than 7.

Incidentally, phase P1: of the combination of a high performance water reducing agent and an expanded filtrate will be explained.

Table 1 shows the physical properties of compatible melamine-based water reducing agents and polymer-based admixtures (high performance water reducing agents).

From Table 1, it can be seen that the melamine-based and polymer-based admixture products have 1, 71 fine bones of normal grain size that change slowly over time, and have a plateau of 1'1'l required for application. If d, H1
1 minute! I found out that I need to take care of 11 cows.

Therefore, it has been found that by using crushed sand with a high content of fine particles of 0.3 gB or less, it is possible to reduce monthly profit separation and excessive brie2/ratio by 11.

1 No. 1・1 Specific examples of the present invention will be explained 1. When we compared the ratio of high performance water reducing agent and 1 part by weight (mixture) of fine grains of crushed sand with f/komol/mol, it was found that the product was the best in 1'l. child.

The comparison results are shown in Table 2.

In the filter table 9, non-shrinkage, high flow, high strength +15f of the present invention
Seven Lucles are shown in Formulation No. 7.

Filter table (20°C curing) In the above filter table, the cement is Ube Ordinary Pol I Land Cement, and the expansion system is lime-based special expansion ratio (7 types of curing: free lime 43%, free CaF 213%) , 11 Ca0
7At203 ・Ca, F240%, gypsum addition °
Shigehiro of Ca 804/A2203 during the expansion moon, O
).

The high-performance water reducing agent is Mermenoto F10゜, manufactured by Showa Dengo Co., Ltd. Crushed sand is a mixture of N[15, NO, and 6, which contains 258 particles of 0.3 mm or less (Nα5 contains 258 particles of 0.3 mm or less). (10%, NFL6 contains 40 parts of fine particles).7. In formulation No. i in Table 1, when the weight part of the expanded portion is small, there is a slight tendency for shrinkage.

B. There are concerns about poor first-place performance.

11. A phenomenon in which the fluidity slightly decreases and the strength decreases by 1 cm is observed.

However, if the weight of the high performance water reducing agent is small, such as in the Nl'L filter, 1. The fluidity decreases, and the filling part due to 15ti and L is inferior, which also causes a decrease in strength.

In addition, when the weight part of the high-performance water reducing agent is large as in formulation Nα4, the viscosity increases and the fluidity becomes low.

Sufficient filling performance cannot be expected with one sink.

In fact, when the weight part of the fine particles in the crushed sand is small, as in blend No. 5, the fluidity becomes large, and the tendency of monthly separation increases, causing a decrease in strength.

However, when the amount of fine particles in the crushed sand is large, as in formulation N (16), the fluidity is somewhat low and sufficient filling properties cannot be expected, which may cause a decrease in strength.

The formulations (parts by weight) of the products of the present invention were derived based on the experimental results of these formulations Nα1 to N[L6.

As shown in Table 2, the product of the present invention has a large flow value indicating flow and dynamicity, a small expansion coefficient, +(: extremely high linear strength, so It has excellent filling properties by pouring, has excellent workability on site, and the filling part can blend well with Conc IJ-1 and reinforcing bars.

Each product of the present invention was compared with a commercially available product and the results are shown in Table 4.

As is clear from Table 4, the product of the present invention has a flow value that indicates fluidity that is extremely thicker than that of the conventional product (commercially available product) both immediately after kneading and after 60 minutes, and has superior fluidity than the conventional product. It can be seen that this shows that

Comparing the expansion rates at 7 days old, they are very small, and non-shrinkage can be ensured.

Furthermore, when comparing the compressive strength on the 28th of the Ordinance, it is extremely high at 915 Kg/ca, indicating that it is a high-strength mortar with a high adhesion strength to concrete and reinforcing bars in the filled part.

According to the present invention, as is clear from the explanation of J.H.

By mixing a Portland cement water reducer and silica sand containing a large amount of fine particles, it is possible to obtain a high-strength mortar that maintains high strength and fluidity and has no shrinkage +1.

Patent applicant: Ube Industries Co., Ltd.

Claims (1)

[Claims] For 100 parts by weight of Portland cement, 12.5 parts by weight of 9-lime-based special expansion agent and 20,000 parts by weight of high performance water reducer +
A non-shrinkable, high-flow, high-strength mortar characterized by mixing and kneading 80.5 parts by weight of silica sand containing 25.8% of fine particles of o-3w1 or less.