CN101486552B - Yellow soil curing agent - Google Patents

Abstract

The invention discloses a yellow soil curing agent YMBER (A Yellow Material becoming Earth into Rock). The prepared yellow soil curing agent is composed of the following raw materials in weight ratio: cementitious material: 75% to 80%, iron oxide yellow: 2% to 4%, slag or slag mixture: 2% to 5%, surfactant 1% to 1.5%, basic catalyst 12% to 15%, the sum of the weight percentages of the above raw materials is 100%, and the content of each raw material The water content is less than 2%, and the mixed raw materials are ground until the Blaine specific surface area is 400-900m ² /kg; the curing principle is: the iron oxide yellow and the above-mentioned other components make the basic structural unit of the soil non-dispersed, and the image interface is tight At the same time of contact, the potential activity of the aluminate minerals in the soil is exerted to form a solid polycrystalline yellow clay aggregate at the interface, thereby improving the nature of the interface contact between the soil particles and making it produce higher strength and water stability. . Under the same conditions, the strength of solidified soil at the same age can be increased by more than 100%, and the performance of impermeability, frost resistance, chemical corrosion resistance and color retention is greatly improved.

Description

A yellow soil stabilizer

technical field

The invention belongs to the technical field of civil engineering and construction materials, and relates to a soil curing agent, in particular to a hydraulic color cementitious material YMBER (A Yellow Material becoming Earth into Rock) applied in civil engineering and construction engineering, that is, a novel yellow soil curing agent.

Background technique

At present, the colored cementitious materials used in civil construction projects are mainly colored Portland cement. This colored cementitious material uses sand and gravel as aggregates, which has a poor effect on soil solidification and has high requirements on water quality. When sand is used as aggregate and colored Portland cement is used as cementitious material to mix concrete, in order not to affect the performance of concrete, in addition to the special requirements for sand and water quality, the soil in the sand must be Clean as much as possible. This is not only time-consuming and labor-intensive, but also in areas with no sand or gravel or poor water quality, the cost of colored concrete projects will increase exponentially.

For the Loess Plateau and the vast areas without sand and gravel materials, it is necessary to seek a high-strength, water-resistant, and strong adaptability that can use sand and stone debris as aggregates like cement, and has no special requirements for mixing water quality, and can make full use of local resources. Water and soil resources, especially the hydraulic color cementitious material that can solidify soil - colored soil curing agent, are urgently needed in reality. Although there are related reports on soil stabilizers, the existing stabilizers often bring problems such as low strength, poor frost resistance, and high cost during use, and they are even weaker links in the development of colored soil stabilizers. Therefore, the research on new soil stabilizers is of great concern to the industry.

Contents of the invention

The object of the present invention is to provide a yellow soil curing agent YMBER (A YellowMaterial becoming Earth into Rock), which is based on slag and aluminosilicate minerals as the main components, adding an appropriate amount of active catalyst to mix the ultrafine active powder , its raw material is easy to get, the price is cheap, and it can react with various types of soil in the vast area without sand and gravel to become a stable and durable forming member. By mixing and rolling with the soil in a certain proportion, it has the properties of compression resistance, anti-seepage and anti-freezing after extrusion and compaction. Not only has the advantages of using natural soil, local materials, reducing sand and gravel transportation, no environmental pollution, saving engineering cost, etc., but also can use or process some common industrial waste such as fly ash, coal rock, slag, steel slag and other materials, so It is also economical and environmentally friendly.

In order to realize above-mentioned task, the present invention takes following technical solution:

A yellow soil curing agent, characterized in that the prepared yellow soil curing agent is composed of the following raw materials in weight ratio: cementitious material: 75% to 80%, iron oxide yellow: 2% to 4%, slag or slag Mixture: 2% to 5%, surfactant 1% to 1.5%, basic catalyst 12% to 15%, the sum of the weight percentages of the above raw materials is 100%, the water content of each raw material is less than 2%, and the mixed raw materials Grind until the Blaine specific surface area is 400-900m ² /kg;

The cementitious material is ordinary Portland gray cement clinker and ordinary Portland gray cement clinker. Ordinary Portland gray cement clinker and ordinary Portland gray cement clinker are prepared at a ratio of 1:2 to 1:2.5;

The alkaline activator is composed of gypsum and fly ash, and the total amount of gypsum is controlled by (4.0±0.2)% of the total amount of SO ₃ in the yellow soil curing agent.

The surfactant is composed of sodium sulfate, alum, sodium silicate and water reducer, wherein sodium sulfate accounts for 10% to 35% of the surfactant, alum accounts for 40% to 50% of the surfactant, and sodium silicate accounts for the surface active agent. 10% to 20% of the surfactant, and 10% to 25% of the surfactant.

The yellow soil curing agent of the present invention can be widely used in water conservancy and hydropower projects, agricultural water and soil projects, and road traffic projects because of its high consolidation strength, good water stability, small deformation, high durability, bright color and long-lasting color retention. , Basic engineering, production of clay, waste residue products, etc.

Detailed ways

The present invention will be described in further detail below in conjunction with the examples given by the inventor.

The yellow soil solidifying agent of the present invention is prepared by mixing the raw materials in the following percentages by weight and grinding to a Blaine specific surface area of ^400-900m2 /kg;

Cementitious material: 75% to 80%:

Basic catalyst: 12% to 15%

Surfactant: 1% to 1.5%;

Slag or slag mixture: 2% to 5%;

Iron oxide yellow: 2% to 4%;

The sum of the weight percentages of the above raw materials is 100%, and the water content of each raw material is less than 2%;

The above-mentioned cementitious materials are ordinary Portland gray cement clinker and ordinary Portland white cement clinker, wherein the ordinary Portland gray cement clinker and ordinary Portland white cement clinker are in a weight ratio of 1:2-1 : 2.5 preparation;

The strength of the above ordinary Portland gray cement clinker and ordinary Portland white cement clinker is greater than 55Mpa, and the magnesium oxide is not greater than 3%.

The above-mentioned slag adopts granulated blast furnace slag conforming to GB203, or granulated electric furnace phosphorus slag conforming to GB6645, or granulated iron slag conforming to GB417, or granulated titanium slag conforming to GB418, or pulverized coal conforming to GB1596 ash; or a slag mixture of at least one of the above compositions.

The novel yellow soil solidifying agent of the present invention has the outstanding feature of bright color of chemical strengthening. The solidification principle is: iron oxide yellow and the above-mentioned other components make the basic structural units of the soil non-dispersed and in close contact with the image interface, and at the same time, exert the potential activity of the aluminate minerals in the soil to form a firm polycrystalline interface. Yellow clay aggregates, thereby improving the nature of the interfacial contact of soil particles, resulting in higher strength and water stability. The curing agent not only works on the interface, but also inside the soil unit, thus further developing the theory of soil curing at room temperature.

The cementitious material constitutes the main body of the reaction, and the reaction time of each component is different during the reaction process, which determines the change of the strength of the hydraulic cementitious material over time, making it continuously strengthened; the interaction of different components in the surfactant, respectively It can activate the potential activity of aluminate minerals in the soil, improve the nature of the soil interface, and then produce high-strength water stability.

The alkaline catalyst among the present invention is made up of gypsum and fly ash, and wherein gypsum content is controlled in (4.0 ± 0.2)% scope with SO content in the black soil solidifying agent, general gypsum and fly ash are configured by 2: 1, alkali The main function of the active catalyst is to catalyze the sulfate radical in the soil to make it participate in the reaction, adjust the setting time, and reduce the heat of hydration.

The surfactant is composed of sodium sulfate, alum, sodium silicate and water reducer, wherein sodium sulfate accounts for 10% to 35% of the surfactant, alum accounts for 40% to 50% of the surfactant, and sodium silicate accounts for the surface active agent. 10% to 20% of the surfactant, and 10% to 25% of the surfactant. On the one hand, the surfactant can be used as an active agent in the curing agent, and on the other hand, it can be used as a dispersant in the grinding process.

The slag or slag mixture is used as an auxiliary filling material to balance the strength of the solidified soil.

The yellow soil solidifying agent finished product main control index that the invention makes is fineness and yellow soil solidifying agent _SO Content, the control of fineness must not be higher than 5% with 200 order square hole sieves, SO in the yellow soil solidifying agent The content of ₃ is controlled within the range of (4.0±0.2)%.

The yellow soil solidifying agent (or title hydraulic cementitious material) that the present invention makes, compares with traditional colored cement, under the same condition, the intensity of solidified body of the same age can improve 100%, impermeability, antifreeze, anti-seepage The chemical corrosion performance is greatly improved, the color retention performance is better than that of colored cement, and one of the main raw materials of the invention is industrial waste residue, which is of great significance for environmental protection.

Below are the embodiments given by the inventor:

Experiment 1: Yellow curing agent formulated with different component ratios

Experiment 2: Strength and chromaticity tests of hydraulic cementitious materials composed of different components

Recipe type  Hydraulic cementitious material standard sand 28d strength Flexural strength color A1 1 2.5 56.8 8.7 yellow A2 1 2.5 51.5 7.5 beige A3 1 2.5 55.5 8.5 Natural yellow A4 1 2.5 59.6 9.1 brown A5 1 2.5 45.8 7.4 light yellow

It can be seen from Table 2 that formulas A1 and A4 have higher strength, and formula A1 has better color.

Experiment 3: Intensity Experiment Protocol and Results

As can be seen from Table 3, the strength of the hydraulic cementitious material of the present invention is compared with that of cement, and component A1 is better than cement.

Experiment 4: Intensity Experiment Protocol and Results

Remarks: YMBER is the yellow soil solidifying agent of the present invention. As can be seen from Table 4, YMBER has significantly better frost resistance than 32.5# cement.

Claims (5)

1. yellow soil solidifying agent, it is characterized in that, this yellow soil solidifying agent that makes is made up of the raw material of following weight ratio: gelling material: 75%～80%, iron oxide yellow: 2%～4%, slag or slag mix: 2%～5%, the weight percent sum of tensio-active agent 1%～1.5%, basic catalyst 12%～15%, above-mentioned raw materials is 100%, and the water content of each raw material is less than 2%, and mixed raw material powder is milled to Blain specific surface 400-900m ²/ kg;

Described gelling material is normal silicate ash concrete grog and normal silicate ash white cement clinker, and normal silicate ash concrete grog and normal silicate ash white cement clinker were by preparation in 1: 2～1: 2.5;

Described tensio-active agent is made up of sodium sulfate, alum, water glass and water reducer, and wherein sodium sulfate is 10%～35%, and alum is 40%～50%, and water glass is 10%～20%, and water reducer is 10%～25%;

Described basic catalyst is made up of gypsum and flyash, and wherein gypsum content is with SO in the yellow soil solidifying agent ₃Content is in (4.0 ± 0.2) % scope inner control.

2. yellow soil solidifying agent as claimed in claim 1 is characterized in that, the intensity of described normal silicate ash concrete grog and normal silicate white cement clinker is greater than 55Mpa, and content of magnesia is not more than 3%.

3. yellow soil solidifying agent as claimed in claim 1 is characterized in that, described slag mix is wherein more than one the combination in slag, slag, scum, flyash, other industrial slag.

4. yellow soil solidifying agent as claimed in claim 1 is characterized in that, described yellow soil solidifying agent finished product major control index is SO in fineness and the yellow soil solidifying agent ₃Content, the control of fineness must not tail over 200 purpose square hole sieves and is higher than 5%, SO in the yellow soil solidifying agent ₃Content be controlled within (4.0 ± 0.2) % scope.

5. yellow soil solidifying agent as claimed in claim 1 is characterized in that, described gypsum and flyash were by preparation in 2: 1.