JPS5949283A - Water glass grouting material made from slag and lime - Google Patents

Abstract

PURPOSE:To provide the titled grouting material having arbitrarily adjustable get time from the flash-setting to the slow-setting, giving arbitrary strength, and suitable for the cut-off of weak ground and the shuttered zone of base rock, etc. and the reinforcement of ground, by adding water glass to a liquid mixture of slag and lime. CONSTITUTION:The objective grouting material is obtained by adding water glass (preferably containing 28-30% of SiO2 and 9-10% of Na2O) to a liquid mixture of fine slag powder pulverized to the size of cement powder, and lime such as slaked lime. The preferable amount of the lime is 15g per 100cc of the grout for flash-setting (3-20sec) and 1.5g per 100cc of grout for slow-setting, and the amount of slag is preferably 10-60g per 100cc of grout. EFFECT:The initial strength can be increased by increasing the amount of lime.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to grouting for the purpose of water stoppage and ground reinforcement in soft ground and fractured zones of subterranean soil.

In general, chemical solutions based on water glass are called solution type! il+
, i, turbid type is 21-) C, the former is used for infiltration into sandy soil, etc., and the latter C is used for viscous ± (clay, silt, loam), sandy layer with relatively large distance μ, or It is used for injection targeting the interface between the dyed structure and the ground. The present invention belongs to suspension type grouting.

Unlike the solution type, this suspension type is injected using methods such as vein injection into clayey soil, injection into and filling of relatively large gaps, or stirring and mixing with water in the ground. Large cement type is the mainstream.

The most commonly used type of cement is LW, which is a mixture of cement and water glass.Usually, the water glass liquid and cement suspension are mixed separately and two pumps are used. This method involves pumping the liquid under pressure, combining the two liquids between the injection pump and the tip of the injection pipe, and injecting the liquid into the ground or into a void to form a glue. In this LW construction method, the glue time is adjusted by changing the strength of the cement contained in the cement suspension.

However, this LW construction method has the following drawbacks.

(1) Since the glue time is adjusted by the amount of cement, it is not possible to arbitrarily determine the glue time and strength.

That is, as the amount of cement is increased, the gluing time becomes faster and the strength tends to increase. Conversely, you cannot increase guru time by controlling intensity.

(2) Even if we increase the number of cement stations, we cannot make the cement setting time instant (less than 10 to 15 seconds).

In order to eliminate the drawbacks of the above-mentioned LW method, a part of the cement is replaced with granulated slag (hereinafter referred to as slag). A grout whose glue time and strength can be arbitrarily determined has been developed and put into practical use.

It is known that this slag undergoes a slow latent hydraulic reaction in the presence of an alkaline agent such as water glass or cement, and exhibits strength comparable to that of cement after hardening.

However, since this cement-slag system replaces a part of the cement with slag, the glue time and strength can be determined arbitrarily to some extent only when the glue time is longer than LW, for example, if it is longer than about 1 minute. It's grout.

An ideal injection phase is one in which the glue time and strength can be determined arbitrarily. In other words, the glue time ranges from instant setting (5 to 20 seconds) to slow setting (about 10 minutes), and the strength ranges from several kg to several tens of kg (1 to 100 kg).
/ctI) It is desirable to have an injection material that can arbitrarily determine the amount of shame and surrounding area.

In addition, suspension-type injection materials can be used for injection into clayey soil in veins, injection into fractured zones such as gravel layers and bedrock with a lot of spring water, and backfilling (cavity) Li.
Although it is used for RA, etc., the time required for construction is as short as possible, depending on the purpose of the construction work and the quality of the soil involved.

In particular, the double-pipe lot construction method was developed in the Kanchi area, and the instant-setting method, which uses instant-setting kale time, came to be widely used.

Therefore, since a short gluing time cannot be expected in LW, a gluing accelerator such as gypsum or metal salts is added and used as instant setting.

Mendo slag type pipes cannot be used in the Ti Ti pipe construction method because instantaneous setting cannot be obtained.

In order to eliminate the drawbacks of the above-mentioned LW and cement-slag thread grout, the present inventors have developed various 1) JF9't:
As a result of sleeping f i'ii, conventional t7) N, ? N-type injection material (D) By combining water glass with a mixture of slag and lime that does not contain any cement, the time (from instant setting to bonding) and strength can be adjusted as desired 4+
This paper proposes an injection rate that allows one tube t2Hj to be obtained.

While tfr, , and lw rely on cement to provide both kale time and strength, the grout of the present invention uses lime for glue time, slag for strength, and water glass is added for strength. This is a grout that is especially designed for maximum durability and strength.

The addition of lime used in the grout of the present invention can be increased or decreased depending on the grout time, so it is not particularly specified, but preferably in the case of instant setting (3 to 20 seconds), the grout (
A+R solution) 15g of lime per 100 cows, and in the case of slow setting (about 10 minutes), approximately 1.5g of lime per 100CC is desirable.

In other words, the preferred amount of lime to be added is 1.5 lime per 1 oocc of grout. It is in the range of F to 15g.

The amount of slag added is not particularly determined as it will vary depending on the desired strength, but slag is preferably added (100c).
10 to 60 g of slag per c.

The slag used in the grout of the present invention is made into a fine powder similar to cement particles. Lime can be either quicklime or slaked lime, both of which can be used, but slaked lime is generally used due to work and handling considerations.

Water glass with a molar ratio of 2 to 4 can be used, but
Among them, one of JISa size is suitable.

In addition to the slag-lime suspension used in the present invention, the BW suspension containing only slag-lime, additives that may be added to ordinary grouting materials, such as fly ash, bentonite, etc.17 ．． It is possible to use materials to which primary minerals such as powdered limestone, rocks, etc., excavated soil, earth and sand collected at the site, and other additives are appropriately added.

Furthermore, by adding a foaming agent to the grout of the present invention, it can be used as an air mortar.

When using the grouting material according to the present invention at a press-fitting site, it is usually carried out in a 1.5-shot method using liquids A, B, etc., as with LW, but in some cases, liquid H (slag- It can also be carried out by a proportional 1.5 shot two-shot method in which a large amount of lime (lime) is mixed.

The purpose of use of the present invention is mainly for vein injection into soft ground (silt, clay), humus, etc., penetration injection into sandy layered ground with relatively many gaps, Injection into fractured zones and cracks in hard ground such as bedrock, targeting the interface between structures and the ground, for example, by LF backfilling, etc., to stop water and strengthen the ground, especially in ground where there is a lot of spring water. It is suitable for this purpose.

Furthermore, 5/IN also exhibits a remarkable effect when stirring and mixing the soil in the ground and the grout material of the present invention in a jet construction method that utilizes ultra-high pressure jet energy.

Hereinafter, the present invention will be explained in more detail by referring to Examples and Comparative Examples.

The water glass used in the following examples is JIS No. 3 (51
02: 28-304, Na2O: 9-10 cycles). The slag is finely powdered water slag (Ga product name: Cerament), and the lime is industrial slaked lime.

Table IK shows the formulation of the conventional method (comparative example).

Table 2 shows the strength of the solidified material obtained.

Table-1 Liquid temperature: 22-23℃ It is possible to adjust the WM of a certain culm degree glue time, but even if you increase the cement bell 1, it will set quickly (5~
20 seconds or less).

In addition, grout in which part of the cement is replaced with slag,
This shows that the signal time cannot be made shorter than LW because the signal time is determined by the amount of cement.

As for the strength in Table 2, it is clear that LW is more determined than cement - brittleness 1 When combined with Table 1, when the keel tie is long, the strength is weak, and conversely, when it is short, the strength is high.
It can be seen that it shows b.

For this L, grout in which part of the cement was replaced with t slag can be used for decorations and enclosures with a glue time of around 1 minute or more [This shows that a predetermined strength can be obtained regardless of the glue time.

Next, a formulation example of the grout of the present invention and a total gel time of -3
Table 4 shows the strength of the solidified material obtained.

/゛″ 1.-/ Table-4 Table-3S・) and”! As shown in Figure 4, by changing the amount of lime f for the grout t of the present invention, it is possible to change the time from instant setting (5 to 15 seconds) to slow setting (approximately 10 minutes). 4U it, -4H, j,
, IIi↓, it can be seen that any strength can be achieved by varying the amount of slag λ. However, it can be seen that any desired glue time and strength can be obtained by combining and adding the amounts of slag and lime using the method of the present invention.

Another feature of the grout of the present invention is that by increasing the amount of lime, the initial strength is increased.

As mentioned above, the grout of the present invention has excellent properties as an injection grout that eliminates the drawbacks of cement grouts.

Claims (1)

[Claims] (1F of 17 soft ground, etc., grau used for water and ground reinforcement) + J, grau used for injection characterized by adding water glass to the mixed axillary of slag and lime) +
J.