TWI843495B - Binder slurry with moisture indicating function and its cured material - Google Patents

Abstract

Binder slurry with a moisture indicating function includes an alkali-activated binder material and an indicator. The alkali-activated binder material accounts for 65 to 99 wt%, and the indicator accounts for 1 to 35 wt%, wherein the indicator at least contains cobaltous chloride. The alkali-activated binder material includes inorganic binder raw materials and alkali-activating liquid, and the inorganic binder raw material contains 70 to 90wt% of silicon dioxide, 9 to 13wt% of calcium oxide, 0.4 to 0.8wt% of potassium oxide, accounting for 0.2 to 0.4wt % iron oxide, and 0.1 to 0.4wt % alumina oxide. The alkali activating liquid contains sodium hydroxide and sodium silicate, and is mixed with the raw material of the inorganic binder material by stirring to make the inorganic binder raw material cross-linking. In the binder slurry with moisture indicating function, the alkali equivalent (AE) is 1 to 18%, the water-binder ratio is 0.2 to 0.6, and the alkali modulus is 0 to2. After being dried, the binder slurry with moisture indicating function exhibits a first color under dry conditions and a second color under wet conditions.

Description

Cementitious slurry with moisture indication function and its cementitious material cured product

The present invention relates to the field of waste recycling, and in particular to a slurry body with moisture indication function and a slurry solidified product thereof.

Most new buildings today use reinforced concrete structures. The concrete in reinforced concrete structures may cause construction joints due to its own drying and shrinkage, structural cracks when subjected to external forces, or water leakage due to poor compactness of the concrete microstructure caused by environmental degradation.

In addition, in terms of structural waterproofing projects, improper construction methods or unreasonable proportions of waterproofing materials may result in poor waterproofing effects. Currently, structural leakage and short protection periods for waterproofing measures are the most common disputes in real estate disputes and should not be ignored.

In order to solve the problems faced by the prior art, a slurry with moisture indication function is provided. The slurry with moisture indication function comprises an alkali-activated slurry material and an indicator. The alkali-activated slurry material accounts for 65 to 99 wt%, and the indicator is added to the alkali-activated slurry material, accounting for 1 to 35 wt%. The alkali-activated adhesive material comprises an inorganic adhesive raw material and an alkali-activated liquid, wherein the inorganic adhesive raw material comprises 70 to 90 wt% of silicon dioxide (SiO ₂ ), 9 to 13 wt% of calcium oxide (CaO), 0.4 to 0.8 wt% of potassium oxide (K ₂ O), 0.2 to 0.4 wt% of iron oxide (Fe ₂ O ₃ ), and 0.1 to 0.4 wt% of aluminum oxide (Al ₂ O ₃ ). The alkali-activated liquid comprises sodium hydroxide (NaOH) and sodium silicate (Na ₂ SiO ₃ ), and is mixed with the inorganic adhesive raw material to crosslink the inorganic adhesive raw material. The indicator comprises at least cobalt chloride (CoCl ₂ ).

In the colloid slurry with moisture indication function, the alkali equivalent is 1 to 18%, the water-to-gel ratio is 0.2 to 0.6, and the alkali modulus is 0 to 2, wherein the alkali equivalent is defined as equation (1), the water-to-gel ratio is defined as equation (2), and the alkali modulus is defined as equation (3).

After drying, the slurry with moisture indication function shows a first color when dry and a second color when wet. The first color is different from the second color.

In some embodiments, the inorganic adhesive binder raw material is selected from the group consisting of reduced slag powder, solder slag powder, blast furnace stone powder, ash powder, converter stone powder, and waste glass powder.

More specifically, in some embodiments, the specific surface area of the inorganic adhesive binder raw material is about 2500 to 4500 cm ² /g. Preferably, in some embodiments, the specific surface area of the inorganic adhesive binder raw material is about 3000 to 4000 cm ² /g.

In some embodiments, the indicator further comprises phenolphthalein. More specifically, the content of phenolphthalein is 0.01 to 10 wt % of the slurry having moisture indicating function.

Preferably, in some embodiments, the indicator is 10 to 35 wt%.

Here, a moisture indicating adhesive cured product is also provided, which is made of an adhesive slurry with moisture indicating function through a curing process and a drying process.

In some embodiments, the curing conditions of the gel slurry with moisture indication function during the curing process are a temperature of 60 to 100 degrees Celsius and a curing time of 24 to 72 hours. Preferably, in some embodiments, the curing conditions are a temperature of 70 to 90 degrees Celsius and a curing time of 48 to 60 hours.

As shown in the above embodiments, inorganic adhesive raw materials are made by mixing waste materials, crosslinked by alkali activation, and matched with indicators, which can be used as slurry coatings applied to concrete structures, or the cured adhesive can be directly used as part of the concrete structure. In this way, industrial waste, such as reduced slag, welding slag, blast furnace stone, ash slag, converter stone, waste glass, etc., can be reused after the proportion of components, which has the advantages of high substitution and wide applicability, and can enhance its added economic value. At the same time, by utilizing the moisture-sensing effect of the indicator and its characteristics of changing color when wet and dry, the structure applied or made can provide instant perception of the structure when water leakage is found in the early stage, and can be reinforced.

A slurry with a moisture indication function is provided. The slurry with a moisture indication function can be applied as a coating to a structure or to a waterproof layer of the structure. The slurry with a moisture indication function comprises an alkali-activated slurry material and an indicator. The alkali-activated slurry material accounts for 65 to 99 wt%, and the indicator is added to the alkali-activated slurry material, accounting for 1 to 35 wt%. Preferably, the indicator accounts for 10 to 35 wt%.

The alkali-activated adhesive material comprises an inorganic adhesive raw material and an alkali-activated liquid, wherein the inorganic adhesive raw material contains 70 to 90 wt% of silicon dioxide, 9 to 13 wt% of calcium oxide, 0.4 to 0.8 wt% of potassium oxide, 0.2 to 0.4 wt% of iron oxide, and 0.1 to 0.4 wt% of aluminum oxide. The alkali-activated liquid at least comprises sodium hydroxide (NaOH) and sodium silicate (Na ₂ SiO ₃ ), and is mixed with the inorganic adhesive raw material to crosslink the inorganic adhesive raw material. After alkali activation, the inorganic adhesive binder raw materials that may dissolve strong alkalinity when in contact with water will form a network structure based on silicon oxide. Most of the raw materials together form the network structure or are surrounded by the network structure, thereby avoiding the dissolution of heavy metal oxides, thus reducing the problem of heavy metal dissolution.

The indicator can be added to the alkali-activated cementing material by stirring to make it evenly distributed, and the indicator contains at least cobalt chloride. Cobalt chloride has high water sensitivity and obvious color change, which can make the cementing slurry with moisture indication function have high moisture sensitivity and can be easily detected by the outside world due to color change.

In the colloid slurry with moisture indication function, the alkali equivalent is 1 to 18%, the water-to-gel ratio is 0.2 to 0.6, and the alkali modulus is 0 to 2, wherein the alkali equivalent is defined as equation (1), the water-to-gel ratio is defined as equation (2), and the alkali modulus is defined as equation (3).

Here, in other words, based on the aforementioned equation (3), it can be understood that in some embodiments, the amount of sodium silicate added can be almost zero, which is conducive to reducing costs. In other embodiments, by adding sodium silicate in a composite alkali-activated manner, it is more conducive to dissolving the aluminum silicate mineral in the waste glass powder to generate a network link.

After drying, the slurry with moisture indication function presents a first color when dry and a second color when wet, and the first color is different from the second color. For example, it presents pink under wet conditions and blue under dry conditions. Here, the aforementioned "dry" refers to when the water content is less than 4%, and "wet" refers to when the water content is higher than 4%.

Here, the raw materials of the inorganic adhesive binder can be reduced slag powder, solder slag powder, blast furnace powder, ash powder, converter powder, and waste glass powder. The above-mentioned material components can be used in a certain proportion according to engineering practice. Different waste raw materials can be selected. It has the advantages of high substitutability, good recyclability, and wide applicability. It has great potential for development and application in civil engineering.

In some embodiments, the specific surface area of the inorganic adhesive binder raw material is about 2500 to 4500 ^cm2 /g. Preferably, in some embodiments, the specific surface area of the inorganic adhesive binder raw material is about 3000 to 4000 ^cm2 /g. The inorganic adhesive binder raw material is usually powdered to provide a suitable specific surface area to facilitate the reaction with the alkaline activating solution to generate a network of cross-linked links.

In some embodiments, the indicator also includes phenolphthalein. More specifically, the content of phenolphthalein accounts for 0.01 to 10 wt% of the colloid slurry with moisture indication function. Phenolphthalein is sensitive to alkali and moisture, but insensitive to acid. For inorganic colloid raw materials made of reduced slag powder, solder slag powder, blast furnace stone powder, ash, converter stone powder, and waste glass powder, it can be checked whether there is damage and leakage, and it can be checked early and reinforced. Phenolphthalein and cobalt chloride can be adjusted to a suitable ratio according to actual needs.

Here, a moisture indicating cementitious solidified material is also provided, which is made of a moisture indicating cementitious slurry through a curing process and a drying process. In other words, after curing and drying, the moisture indicating cementitious solidified material increases its mechanical compressive strength and can be directly used as a structure or replace part of the Portland cement. At the same time, the structure can have a color indicating function, through moisture sensitivity and color change, it can be easily detected by the outside world when a small amount of penetration occurs, and can be repaired immediately. In some embodiments, the curing conditions of the moisture indicating cementitious slurry during the curing process are a temperature of 60 to 100 degrees Celsius and a curing time of 24 to 72 hours. Preferably, in some embodiments, the curing condition is a temperature of 70 to 90 degrees Celsius and a curing time of 48 to 60 hours.

In some embodiments, the drying process can be achieved by air drying, baking, or other methods of removing moisture, so that the moisture content of the solidified material is less than 4%, and this can be determined by the color change of the indicator.

In summary, the purpose of this case is to use the proportion of waste to make inorganic adhesive raw materials, which can be cross-linked after alkali activation and matched with indicators. It can be used as a slurry coating applied to concrete structures, or the cured adhesive can be directly used as part of the concrete structure. In this way, industrial waste, such as reduced slag, solder slag, blast furnace stone, ash slag, converter stone, waste glass, etc., can be used after the proportion of components. It has the advantages of high substitution and wide application, and can enhance the additional economic value of recycled materials. At the same time, by using the moisture-sensing effect of the indicator and its wet and dry color-changing characteristics, the structure applied or made can provide instant perception of the structure when water leakage is found in the early stage, and can be reinforced.

Although the technical content of the present invention has been disclosed as above with the preferred embodiment, it is not used to limit the present invention. Any slight changes and modifications made by anyone familiar with this art without departing from the spirit of the present invention should be included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the scope defined by the attached patent application.

Claims (10)

A slurry with a moisture indication function comprises: an alkali-activated slurry material, accounting for 65 to 99 wt%, comprising an inorganic slurry raw material and an alkali-activated liquid, wherein the inorganic slurry raw material contains 70 to 90 wt% of silicon dioxide, 9 to 13 wt% of calcium oxide, 0.4 to 0.8 wt% of potassium oxide, 0.2 to 0.4 wt% of iron oxide, and 0.1 to 0.4 wt% of aluminum oxide, the alkali-activated liquid contains sodium hydroxide and sodium silicate, and is mixed with the inorganic slurry raw material. The invention relates to a method for preparing a slurry comprising mixing an organic binder material and an inorganic binder material so as to crosslink the inorganic binder material; and an indicator is added to the alkali-activated binder material in an amount of 1 to 35 wt%, wherein the indicator comprises at least cobalt chloride; wherein the slurry having a moisture indicating function has an alkali equivalent of 1 to 18%, a water-to-gel ratio of 0.2 to 0.6, and an alkali modulus of 0 to 2; wherein the alkali equivalent is defined as equation (1), the water-to-gel ratio is defined as equation (2), and the alkali modulus is defined as equation (3);

;as well as

After drying, the colloid slurry with moisture indication function presents a first color when dry and a second color when wet, and the first color is different from the second color. The colloid slurry with moisture indication function as described in claim 1, wherein the inorganic colloid raw materials are selected from the group consisting of reduced slag powder, solder slag powder, blast furnace stone powder, ash powder, converter stone powder, and waste glass powder. The colloid slurry with moisture indication function as described in claim 2, wherein the specific surface area of the inorganic colloid raw materials is about 2500 to 4500 ^cm2 /g. The colloid slurry with moisture indicating function as described in claim 3, wherein the specific surface area of the inorganic colloid raw materials is about 3000 to 4000 cm ² /g. A colloid slurry with moisture indication function as described in claim 1, wherein the indicator also contains phenolphthalein. As described in claim 5, the content of phenolphthalein accounts for 0.01 to 10 wt% of the slurry with moisture indication function. A slurry with moisture indication function as described in claim 1, wherein the indicator is 10 to 35 wt%. A cured adhesive with moisture indication function is made by subjecting a cured adhesive with moisture indication function as described in any one of claims 1 to 7 to a curing process and a drying process. As described in claim 8, the cured adhesive with moisture indication function is cured under a curing condition of 60 to 100 degrees Celsius for a curing time of 24 to 72 hours. The adhesive cured product with moisture indication function as described in claim 9, wherein the curing condition is a temperature of 70 to 90 degrees Celsius and a curing time of 48 to 60 hours.