JPS58176164A - Mortar concrete binder - 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 mortar/concrete binder that has sufficient workability, strength development, and chemical resistance and is used as a permanent material such as granulated blast furnace slag.

It has been known that adding an alkaline stimulant such as sodium hydroxide to finely powdered granulated blast furnace slag causes hydraulic properties;
There are many problems such as den (poor surface hardening) phenomenon and cracking, and it has not been put into practical use.

To solve these problems, it is necessary to use suitable additives to create mortar and concrete mixes that have high fluidity, low flowdown and slump loss, and a low water-slag ratio. be.

However, among the commonly available commercially available td solutions, β-naphthalene sulfone [1! The weir type has a large slump loss and is good for workability, the lignosulfonate type has a slow and small increase in brightness development, and the oxyorganic acid salt type has the effect of improving initial workability and strength growth. However, since the setting time varies markedly depending on the curing temperature and is difficult to control, it is not possible to solve the above problem simply by adding them.

As a result of various studies in order to eliminate such problems, the present inventors have found that it is possible to use a specific cement water reducing agent in combination, and have completed the present invention.

That is, the present invention provides granulated blast furnace slag 1001: 1 to 15 parts by weight of alkali gold tetrahydroxide and/or alkali metal carbonate, and an organic compound having a sulfone group in the molecule and an oxyorganic acid. Or its weight ratio with the salt 'L1:
0.07~1: 0.4? This is a mortar/concrete M base material containing 0.1 to 4 parts by weight.

Hereinafter, to explain the present invention in detail, the granulated blast furnace slag is
A general one is sufficient, and its preferred fineness is:
Plain specific surface area 3.000~8.000CrIL"
/9 Te;! b); a. Powderness is 3.000ffi2/
If it is smaller than 9, strength development will be poor, and
There is not much advantage in terms of strength development in grinding to a strength exceeding 8.000 cIt2//, and on the contrary, it is not economical since the grinding requires power.

Addition of alkali gold hydroxide and/or alkali metal carbonate as an alkaline stimulant - song is granulated blast furnace slag 1
It is required that the amount is 1 to 15 parts by weight relative to 0.01 parts by weight.If the amount is smaller than this, the strength development Q1 will be low, and even if the amount is large, there will be no increase in strength.Preferably 2 to 10 parts by weight. be. Alkali hydroxide, alkali metal carbonate, and Y
Using them together has the advantage of increasing long-term strength.

As alkali gold tetrahydroxide and alkali metal carbonate,
Lithium, sodium, potassium, etc. are used,
In part, sodium 17um salts are preferred.

The present invention uses, as a water reducing agent, an organic compound having a sulfone group in the molecule and an oxyorganic acid or a salt thereof in combination with a binding material consisting of the above-mentioned water-reducing slag and an alkaline stimulant. Therefore, there is one main feature that solves the problems described in TJ.

In other words, conventional water reducing agents include alkylaryl sulfonate, aromatic sulfonate, water-soluble melamine formalin sulfonic acid, lignin sulfonate, and oxyorganic acid salts. Among these, in the present invention, two specific components are selected and used in a specific ratio.

One of the components is an organic compound having a sulfone group in the molecule, such as I-naphthalene sulfonate formalin sftw-p lignin sulfonate, and the other component is
Gluconic acid, citric acid 1. Oxyorganic acids such as tartaric acid and phosphoric acid, or their sodium, potassium, and calcium salts.

In the present invention, the usage ratio of these two components is important,
Weight ratio of organic adduct nioxy organic acid or its salt having a sulfone group in the molecule: 1:0.07 to 1:0-
It is necessary to set it to 4. When the ratio is less than 0.07, there is no effect of improving workability and strength increase, and
There is no increase in strength even if 0.4 is lost.

The amount of the water reducing agent having such a distribution is 0.1 to 4 parts by weight, preferably 0.3 to 31 parts by weight, per 100 parts by weight of granulated blast furnace slag. If it is less than 0.1 parts by weight, the effect of improving workability and strength χ is small, and if it exceeds 4iit parts, workability can be improved, but the initial strength development will be significantly worse.

The components of the granulated blast furnace slag, alkaline stimulant, and water reducer according to the present invention may be distributed in advance, or may be added at the time of mixing of matte, mortar, and concrete. Furthermore, there is no problem in further adding concrete admixtures such as general E agents, foaming agents, antifoaming agents, waterproofing agents, antifreeze agents, rust preventives, and acid-resistant agents.

When using the mortar-concrete binder according to the present invention, the water-slag ratio can be reduced to 40% or less, and in normal applications, it can be applied at a consistency of 35%. Therefore, the drawbacks of conventional slag cement are completely eliminated, and it has excellent properties such as warm, dense structure, acid resistance, heat resistance, lff + freeze-thaw scale resistance, and durability. There is a young fruit that is said to yield concrete which is not less prized.

Hereinafter, examples will be described in detail.

Example 1 Granulated blast furnace slag powder with a fineness of 5.120 (:Il"/l/), water reducing agent, !-formalin condensate of sodium naphthalene sulfonate (hereinafter abbreviated as βNS), sodium lignin sulfonate (hereinafter abbreviated as L day) and sodium gluconate (hereinafter abbreviated as G) were distributed in a uniform manner. time (first train), and 10 cured in a 20"C160~80%R,H
The compressive strength sound of the φx20crlL specimen was measured.

Table 2 shows the component ratios of water reducing agents and their measurement values. Test results A1-6 and 19-22 are comparative examples, and tests A1-18 are examples of the present invention.

In the example shown in Table 1 and below, sodium hydroxide and soda soda were used together as an alkali agent, but when only sodium hydroxide was used, the initial strength increased, but the length @ strength did not increase, and carbonate soda Only using χ showed the opposite trend. Furthermore, the effects of water reducing agents showed a similar trend.

Example 2 Table 6 shows polished rice that was tested by changing the addition tv of the water reducing agent when distributing the rice grain 11. Experiments A23 and 32 are comparative examples, and Experiments A-424 to A-61 are examples of the present invention.

As shown in Example 1.2 below, the addition of βNB and L8°G alone cannot achieve both appropriate working time and strength elongation. Furthermore, the influence on delay and slump is in the order of G, ;)L8)βNS, and G has the largest contribution to the growth of the strength of the long-term attachment. However, when GY is used alone, the control is not good, and when it is added to multiple filters, the initial setting is significantly delayed.
This can cause material separation, spot hardening, drying, cracking, etc., and this tendency becomes more pronounced at low temperatures.

Claims (1)

[Claims] For 100 parts by weight of granulated blast furnace slag, 1 to 15 parts by weight of an alkali metal hydroxide and/or an alkali metal carbonate, an organic compound having a sulfonic group in the molecule, and an organic acid or its salt. The weight ratio is 1:0.07 to 1:0.
A mortar/concrete binding material containing χ0.1 to 4.