Soft soil curing agent

Abstract

The invention relates to the technical field of curing products, and particularly discloses a soft soil curing agent which is prepared from the following components in percentage by mass: 15-20% of sodium silicate, 4.5-5.5% of urea resin, 33-38% of calcium chloride dihydrate, 3.4-4.0% of carboxymethyl cellulose, 5.2-6.1% of chitin and 30-34% of polyaluminum chloride. Sodium silicate melt generated by melting at the temperature of 1300-1400 DEG C is obtained and cooled and smashed to obtain solid sodium silicate, the residue on a square hole sieve of calcium chloride dihydrate is smaller than or equal to 5%, and the alkalinity of calcium chloride dihydrate is smaller than or equal to 0.35%. Sodium silicate, urea resin, calcium chloride dehydrate, carboxymethyl cellulose, chitin and polymerization chloride form a soft soil curing agent, and the soft soil curing agent is compounded with a soft soil foundation, so that the soft soil foundation has the characteristics of good pressure load resistance and low settling volume, and the unmeasured compressive strength is effectively improved while the fluidity of neat paste is ensured.

Description

Technical Field

[0001] The invention relates to the technical field of solidified products, in particular to a soft soil solidifying agent. Background Art

[0002] Soft soil solidifiers are materials used to improve the engineering properties of soft soil. By physically and chemically reacting with the soil, they increase its strength, reduce its compressibility, and reduce its permeability. They are primarily used to treat soft soil foundations in buildings, improving their bearing capacity and ensuring their stability. For smaller buildings with fewer floors or those with relatively low requirements for foundation deformation, using soft soil solidifiers to treat the foundation can effectively reduce project costs. However, their ability to withstand load pressures needs to be considered when used in coastal cities. Traditional cement and lime-based solidifiers primarily react with minerals such as tricalcium silicate and dicalcium silicate to form gels such as hydrated calcium silicate and calcium hydroxide, filling the pores between soil particles. They also undergo ion exchange and agglomeration with the surface of the soil particles, bonding the soil particles together and improving the strength of the soft soil. Consequently, their ability to withstand load pressures is poor, making them unsuitable for use in coastal cities. Summary of the Invention

[0003] In response to the problems in the prior art, the present invention provides a soft soil solidifying agent. The technical solution adopted by the present invention to solve the technical problems is: a soft soil solidifying agent is prepared from sodium silicate, urea-formaldehyde resin, calcium chloride dihydrate, carboxymethyl cellulose, chitin and polyaluminium chloride in the following mass percentages:

[0004] Among them, sodium silicate is 15-20%, urea-formaldehyde resin is 4.5-5.5%, calcium chloride dihydrate is 33-38%, carboxymethyl cellulose is 3.4-4.0%, chitin is 5.2-6.1%, and polyaluminium chloride is 30-34%.

[0005] Preferably, the sodium silicate is obtained by obtaining a sodium silicate melt generated by melting at 1300-1400° C., and then cooling and crushing the melt to obtain solid sodium silicate.

[0006] Preferably, the residue on the square hole sieve of the calcium chloride dihydrate is ≤5%, and the alkalinity of the calcium chloride dihydrate is ≤0.35%.

[0007] Preferably, the residue on the polyaluminium chloride square hole sieve is ≤5%.

[0008] Preferably, the polyaluminium chloride is solid polyaluminium chloride, and the moisture content of the polyaluminium chloride is required to be ≤5%.

[0009] Preferably, the chitosan is organically prepared from the shells of crustaceans such as shrimps and crabs.

[0010] Preferably, the prepared soft soil solidifying agent has a sieve residue of ≤0.8 when passing through an 80 μm square hole sieve, and a moisture content of less than 1%.

[0011] Preferably, the urea-formaldehyde resin has a water absorption rate of 0.20% to 0.22% and a volume shrinkage rate of 0.048% to 0.051%.

[0012] Compared with the prior art, the beneficial effects of the present invention are: after the soft soil foundation is compounded with a soft soil curing agent composed of sodium silicate, urea-formaldehyde resin, calcium chloride dihydrate, carboxymethyl cellulose, chitin and polychlorination, the soft soil foundation has good compressive load resistance and low settlement characteristics, and while ensuring the fluidity of the net slurry, the unconfined compressive strength is effectively improved. DETAILED DESCRIPTION

[0013] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below in conjunction with specific implementation methods.

[0014] Example 1

[0015] The soft soil solidifying agent of the present invention is prepared from sodium silicate, urea-formaldehyde resin, calcium chloride dihydrate, carboxymethyl cellulose, chitin and polyaluminium chloride in the following mass percentages:

[0016] Among them, sodium silicate is 15-20%, urea-formaldehyde resin is 4.5-5.5%, calcium chloride dihydrate is 33-38%, carboxymethyl cellulose is 3.4-4.0%, chitin is 5.2-6.1%, and polyaluminium chloride is 30-34%.

[0017] In an optional implementation of this embodiment, sodium silicate is prepared by obtaining a sodium silicate melt generated by melting at 1300-1400° C., and cooling and crushing the melt to obtain solid sodium silicate.

[0018] In an optional implementation manner of this embodiment, the residue on the square hole sieve of calcium chloride dihydrate is ≤5%, and the alkalinity of calcium chloride dihydrate is ≤0.35%.

[0019] In an optional implementation manner of this embodiment, the residue on the square hole sieve of polyaluminium chloride is ≤5%.

[0020] In an optional implementation manner of this embodiment, the polyaluminium chloride is solid polyaluminium chloride, and the moisture content of the polyaluminium chloride is required to be ≤5%.

[0021] In an optional implementation of this embodiment, chitosan is organically prepared from the shells of shrimps, crabs and other crustaceans.

[0022] In an optional implementation of this embodiment, the water absorption rate of the urea-formaldehyde resin is 0.20% to 0.22%, and the volume shrinkage rate is 0.048% to 0.051%.

[0023] The prepared soft soil solidifying agent has a sieve residue of ≤0.8 when passing through an 80-μm square hole sieve, and a moisture content of less than 1%.

[0024] Example 2

[0025] The soft soil solidifying agent of the present invention is prepared from sodium silicate, urea-formaldehyde resin, calcium chloride dihydrate, carboxymethyl cellulose, chitin and polyaluminium chloride in the following mass percentages:

[0026] Among them, sodium silicate is 15-20%, urea-formaldehyde resin is 4.5-5.5%, calcium chloride dihydrate is 33-38%, carboxymethyl cellulose is 3.4-4.0%, chitin is 5.2-6.1%, and polyaluminium chloride is 30-34%.

[0027] In an optional implementation of this embodiment, sodium silicate is prepared by obtaining a sodium silicate melt generated by melting at 1300-1400° C., and cooling and crushing the melt to obtain solid sodium silicate.

[0028] In an optional implementation manner of this embodiment, the residue on the square hole sieve of calcium chloride dihydrate is ≤5%, and the alkalinity of calcium chloride dihydrate is ≤0.35%.

[0029] In an optional implementation manner of this embodiment, the residue on the square hole sieve of polyaluminium chloride is ≤5%.

[0030] In an optional implementation manner of this embodiment, the polyaluminium chloride is solid polyaluminium chloride, and the moisture content of the polyaluminium chloride is required to be ≤5%.

[0031] In an optional implementation of this embodiment, chitosan is organically prepared from the shells of shrimps, crabs and other crustaceans.

[0032] In an optional implementation of this embodiment, the water absorption rate of the urea-formaldehyde resin is 0.20% to 0.22%, and the volume shrinkage rate is 0.048% to 0.051%.

[0033] The prepared soft soil solidifying agent has a sieve residue of ≤0.8 when passing through an 80-μm square hole sieve, and a moisture content of less than 1%.

[0034] In this embodiment, 18% sodium silicate, 5.3% urea-formaldehyde resin, 35% calcium chloride dihydrate, 3.8% carboxymethyl cellulose, 5.6% chitosan, and 32.3% polyaluminum chloride were used to prepare a soft soil solidifying agent, and the performance of the soft soil solidifying agent obtained in this embodiment was tested.

[0035]

[0036]

[0037] The strength conditions are: 10% of the soft soil solidifying agent obtained in Example 1, 90% of soil, and a water-cement ratio of 1:1; and the dimensions of the unconfined compressive strength are: a diameter of 39 mm and a height of 88 mm.

[0038] Example 3

[0039] The soft soil solidifying agent of the present invention is prepared from sodium silicate, urea-formaldehyde resin, calcium chloride dihydrate, carboxymethyl cellulose, chitin and polyaluminium chloride in the following mass percentages:

[0040] Among them, sodium silicate is 15-20%, urea-formaldehyde resin is 4.5-5.5%, calcium chloride dihydrate is 33-38%, carboxymethyl cellulose is 3.4-4.0%, chitin is 5.2-6.1%, and polyaluminium chloride is 30-34%.

[0041] In an optional implementation of this embodiment, sodium silicate is prepared by obtaining a sodium silicate melt generated by melting at 1300-1400° C., and cooling and crushing the melt to obtain solid sodium silicate.

[0042] In an optional implementation manner of this embodiment, the residue on the square hole sieve of calcium chloride dihydrate is ≤5%, and the alkalinity of calcium chloride dihydrate is ≤0.35%.

[0043] In an optional implementation manner of this embodiment, the residue on the square hole sieve of polyaluminium chloride is ≤5%.

[0044] In an optional implementation manner of this embodiment, the polyaluminium chloride is solid polyaluminium chloride, and the moisture content of the polyaluminium chloride is required to be ≤5%.

[0045] In an optional implementation of this embodiment, chitosan is organically prepared from the shells of shrimps, crabs and other crustaceans.

[0046] In an optional implementation of this embodiment, the water absorption rate of the urea-formaldehyde resin is 0.20% to 0.22%, and the volume shrinkage rate is 0.048% to 0.051%.

[0047] The prepared soft soil solidifying agent has a sieve residue of ≤0.8 when passing through an 80-μm square hole sieve, and a moisture content of less than 1%.

[0048] In this embodiment, 17% sodium silicate, 4.8% urea-formaldehyde resin, 37% calcium chloride dihydrate, 3.5% carboxymethyl cellulose, 5.3% chitin, and 33.4% polyaluminum chloride were used to prepare a soft soil solidifying agent, and the performance of the soft soil solidifying agent obtained in this embodiment was tested.

[0049]

[0050] Example 4

[0051] The soft soil solidifying agent of the present invention is prepared from sodium silicate, urea-formaldehyde resin, calcium chloride dihydrate, carboxymethyl cellulose, chitin and polyaluminium chloride in the following mass percentages:

[0052] Among them, sodium silicate is 15-20%, urea-formaldehyde resin is 4.5-5.5%, calcium chloride dihydrate is 33-38%, carboxymethyl cellulose is 3.4-4.0%, chitin is 5.2-6.1%, and polyaluminium chloride is 30-34%.

[0053] In an optional implementation of this embodiment, sodium silicate is prepared by obtaining a sodium silicate melt generated by melting at 1300-1400° C., and cooling and crushing the melt to obtain solid sodium silicate.

[0054] In an optional implementation manner of this embodiment, the residue on the square hole sieve of calcium chloride dihydrate is ≤5%, and the alkalinity of calcium chloride dihydrate is ≤0.35%.

[0055] In an optional implementation manner of this embodiment, the residue on the square hole sieve of polyaluminium chloride is ≤5%.

[0056] In an optional implementation manner of this embodiment, the polyaluminium chloride is solid polyaluminium chloride, and the moisture content of the polyaluminium chloride is required to be ≤5%.

[0057] In an optional implementation of this embodiment, chitosan is organically prepared from the shells of shrimps, crabs and other crustaceans.

[0058] In an optional implementation of this embodiment, the water absorption rate of the urea-formaldehyde resin is 0.20% to 0.22%, and the volume shrinkage rate is 0.048% to 0.051%.

[0059] The prepared soft soil solidifying agent has a sieve residue of ≤0.8 when passing through an 80-μm square hole sieve, and a moisture content of less than 1%.

[0060] In this embodiment, 16% sodium silicate, 4.8% urea-formaldehyde resin, 35% calcium chloride dihydrate, 4.0% carboxymethyl cellulose, 6.0% chitosan, and 34% polyaluminum chloride were used to prepare a soft soil solidifying agent, and the performance of the soft soil solidifying agent obtained in this embodiment was tested.

[0061]

[0062] It can be seen from the test tables provided in Examples 2, 3 and 4 that the soft soil curing agent provided by the present invention can make the soft soil foundation have good compressive load resistance and low settlement characteristics, and effectively improve the unconfined compressive strength while ensuring the fluidity of the net slurry.

[0063] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the above-described embodiments. The above-described embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A soft soil solidifying agent, characterized in that: It is made of sodium silicate, urea-formaldehyde resin, calcium chloride dihydrate, carboxymethyl cellulose, chitosan and polyaluminium chloride in the following mass percentages: Among them, sodium silicate is 15-20%, urea-formaldehyde resin is 4.5-5.5%, calcium chloride dihydrate is 33-38%, carboxymethyl cellulose is 3.4-4.0%, chitin is 5.2-6.1%, and polyaluminium chloride is 30-34%.

2. A soft soil solidifying agent according to claim 1, characterized in that: The sodium silicate is prepared by obtaining a sodium silicate melt generated by melting at 1300-1400° C., and cooling and crushing the melt to obtain solid sodium silicate.

3. The soft soil solidifying agent according to claim 1, characterized in that: The residue on the square hole sieve of the calcium chloride dihydrate is ≤5%, and the alkalinity of the calcium chloride dihydrate is ≤0.35%.

4. The soft soil solidifying agent according to claim 1, characterized in that: The residue on the square hole sieve of the polyaluminium chloride is ≤5%.

5. The soft soil solidifying agent according to claim 1, characterized in that: The polyaluminium chloride is solid polyaluminium chloride, and the water content of the polyaluminium chloride is required to be ≤5%.

6. The soft soil solidifying agent according to claim 1, characterized in that: The chitosan is organically prepared from the shells of shrimps, crabs and other crustaceans.

7. The soft soil solidifying agent according to claim 1, characterized in that: The water absorption rate of the urea-formaldehyde resin is 0.20% to 0.22%, and the volume shrinkage rate is 0.048% to 0.051%.

8. The soft soil solidifying agent according to claim 1, characterized in that: The prepared soft soil solidifying agent has a sieve residue of ≤0.8 when passing through an 80-μm square hole sieve, and a moisture content of less than 1%.

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