Dispersant for premixed fluidized solidified soil, preparation method and application thereof

Abstract

A dispersant for premixed fluidized solidified soil includes the following raw materials in parts by weight: 5 parts to 15 parts of an anti-adhesion water reducer, 0.5 parts to 0.8 parts of a stabilizer, and 85 parts to 95 parts of water. The anti-adhesion water reducer is compounded by an inorganic dispersant and an aminosulfonic acid-based superplasticizer (ASP), and the inorganic dispersant is at least one selected from the group consisting of sodium silicate, sodium hexametaphosphate, and sodium pyrophosphate. In the present disclosure, on the premise of improving fluidity of mucky cohesive soil slurry, a strength of the fluidized solidified soil at each stage is adjusted through a water-reducing effect of the anti-adhesion water reducer. Moreover, rapid dispersion of the mucky cohesive soil slurry is realized, thus providing key technical support for preparation of the premixed fluidized solidified soil from undisturbed soil in non-dry conditions.

Claims

1. A dispersant for premixed fluidized solidified soil, comprising the following raw materials in parts by weight: 5 parts to 15 parts of an anti-adhesion water reducer, 0.5 parts to 0.8 parts of a stabilizer, and 85 parts to 95 parts of water; wherein the anti-adhesion water reducer is compounded by sodium pyrophosphate and an aminosulfonic acid-based superplasticizer (ASP) at a weight ratio of 2:1.

2. The dispersant according to claim 1, wherein the stabilizer is a phosphite.

3. The dispersant according to claim 1, comprising the following raw materials in parts by weight: 6 parts to 12 parts of the anti-adhesion water reducer, 0.6 parts of the stabilizer, and 87.4 parts to 93.4 parts of the water.

4. The dispersant according to claim 1, comprising the following raw materials in parts by weight: 7.5 parts to 10.5 parts of the anti-adhesion water reducer, 0.6 parts of the stabilizer, and 88.9 parts to 91.9 parts of the water.

5. The dispersant according to claim 1, comprising the following raw materials in parts by weight: 9 parts of the anti-adhesion water reducer, 0.6 parts of the stabilizer, and 90.4 parts of the water.

6. A preparation method of the dispersant for premixed fluidized solidified soil according to claim 1, comprising the following steps: mixing the anti-adhesion water reducer, the stabilizer, and the water uniformly to obtain the dispersant for premixed fluidized solidified soil.

Description

DETAILED DESCRIPTION OF THE EMBODIMENTS

(1) To make the objective, technical solutions and advantages of the present disclosure clearer, the present disclosure will be further described below in detail below with reference to the examples. Understandably, the specific examples described herein are merely intended to explain the present disclosure but not to limit the present disclosure.

(2) A first aspect of the present disclosure provides a dispersant for premixed fluidized solidified soil, including the following raw materials in parts by weight: 5 parts to 15 parts of an anti-adhesion water reducer, 0.5 parts to 0.8 parts of a stabilizer, and 85 parts to 95 parts of water. The anti-adhesion water reducer is compounded by an inorganic dispersant and an ASP.

(3) The inorganic dispersant is at least one selected from the group consisting of sodium silicate, sodium hexametaphosphate, and sodium pyrophosphate, preferably the sodium pyrophosphate. During the test, it was unexpectedly found that the anti-adhesion water reducer compounded by the sodium pyrophosphate and the ASP at a weight ratio of 2:1 is more conducive to exerting its synergistic effect, thereby significantly improving the fluidity of the in-situ mucky cohesive soil slurry and the strength of the prepared fluidized solidified soil.

(4) In the present disclosure, the stabilizer is a phosphite.

(5) Preferably, the dispersant for premixed fluidized solidified soil includes the following raw materials in parts by weight: 6 parts to 12 parts of the anti-adhesion water reducer, 0.6 parts of the stabilizer, and 87.4 parts to 93.4 parts of water.

(6) More preferably, the dispersant for premixed fluidized solidified soil includes the following raw materials in parts by weight: 7.5 parts to 10.5 parts of the anti-adhesion water reducer, 0.6 parts of the stabilizer, and 88.9 parts to 91.9 parts of water.

(7) More preferably, the dispersant for premixed fluidized solidified soil includes the following raw materials in parts by weight: 9 parts of the anti-adhesion water reducer, 0.6 parts of the stabilizer, and 90.4 parts of water.

(8) A second aspect of the present disclosure provides a preparation method of the dispersant for premixed fluidized solidified soil, including the following steps: mixing the anti-adhesion water reducer, the stabilizer, and water uniformly to obtain the dispersant for premixed fluidized solidified soil.

(9) In the present disclosure, the anti-adhesion water reducer, the stabilizer, and water are uniformly mixed at a room temperature.

(10) A third aspect of the present disclosure provides an application of the dispersant for premixed fluidized solidified soil in in-situ preparation of the premixed fluidized solidified soil using mucky cohesive soil.

(11) In the present disclosure, the in-situ preparation of the premixed fluidized solidified soil using mucky cohesive soil includes: mixing the mucky cohesive soil with the dispersant uniformly to obtain an improved mucky cohesive soil slurry; and mixing the improved mucky cohesive soil slurry uniformly with a solidifying agent, and conducting molding, primary curing, demolding, and secondary curing to obtain the premixed fluidized solidified soil.

(12) In the present disclosure, the dispersant is used at 4 mass % to 8 mass %, preferably 6 mass % of the mucky cohesive soil.

(13) In the present disclosure, the solidifying agent is a conventional solidifying agent in the field, and those skilled in the art can select a solidifying agent according to the actual situation without limitation. Further, the solidifying agent is used at 10 mass % to 30 mass %, preferably 20 mass % of the improved mucky cohesive soil slurry.

(14) In the present disclosure, the primary curing is conducted at 20 C. to 30 C., further 25 C. and a relative humidity of 80% to 90%, further 90% for 36 h to 72 h, further 48 h.

(15) In the present disclosure, the secondary curing is conducted at 20 C. to 30 C., further 25 C. and a relative humidity of 80% to 90%, further 90% for 7 d to 90 d, such as 14 d, 28 d, 60 d, and 90 d.

(16) To avoid redundant description, in the following examples of the present disclosure, the mucky cohesive soil (undisturbed soil) is obtained by the following steps: for mucky cohesive soil stratum, conducting drilling and collecting soil in situ using a long auger drill, to obtain the mucky cohesive soil. The mucky cohesive soil has a water content of 42.8%, a compressibility coefficient of 0.78 MPa, and a compressive modulus of 2.90 MPa.

(17) Example 1

(18) Screening of different anti-adhesion water reducers: anti-adhesion water reducers compounded by different inorganic salts and ASP were added to undisturbed soil (at 3% of the undisturbed soil), and a slurry outflow time of each sample was determined. A dispersing effect of different anti-adhesion water reducers on the slurry was considered by testing the slurry outflow time, and the results were shown in Table 1.

(19) TABLE-US-00001 TABLE 1 Performance test results of different anti-adhesion water reducers Groups Anti-adhesion water reducer Slurry outflow time/s Group 1 ASP + sodium silicate (1:2) 54.96 Group 2 ASP + sodium hexametaphosphate (1:2) 68.40 Group 3 ASP + sodium carbonate (1:2) No fluidity Group 4 ASP + sodium pyrophosphate (1:2) 46.30

(20) It was seen from Table 1 that the anti-adhesion water reducer compounded by the sodium pyrophosphate and the ASP at a weight ratio of 2:1 could significantly improve the fluidity of the mucky cohesive soil slurry, and could ultimately help to improve the strength of the prepared fluidized solidified soil.

(21) Example 2

(22) Performance test of different dispersants for premixed fluidized solidified soil:

(23) (1) Different dispersants were formulated according to a formula in Table 1. The anti-adhesion water reducer was compounded by sodium pyrophosphate and ASP at a weight ratio of 2:1; the stabilizer was a phosphite.

(24) TABLE-US-00002 TABLE 2 Composition of different dispersants Anti-adhesion water reducer Stabilizer Water Groups (part) (part) (part) Group 5 6 0.6 93.4 Group 6 7.5 0.6 91.9 Group 7 9 0.6 90.4 Group 8 10.5 0.6 88.9 Group 9 12 0.6 87.4 Group 10 / / 100

(25) (2) An improved mucky cohesive soil slurry was separately prepared with the different dispersants in Groups 5 to 10 or pure water. The different dispersants or the pure water was poured into a mixing bucket pre-filled with mucky cohesive soil (the dispersants or the pure water was used at 6% of the mucky cohesive soil). A stirring device was started; an initial stirring rate was set to 100 r/min, until the stirring rate increased to 120 r/min. Stirring was conducted for 10 min to obtain the improved mucky cohesive soil slurry. Table 3 showed a slurry outflow time for each of the improved mucky cohesive soil slurry prepared by different dispersants or pure water.

(26) TABLE-US-00003 TABLE 3 Performance test results of improved mucky cohesive soil slurry Groups Slurry outflow time/s Group 5 51.33 Group 6 47.62 Group 7 42.56 Group 8 46.53 Group 9 50.26 Group 10 72.24

(27) It was seen from Table 3 that the mucky cohesive soil slurry prepared using the dispersant for mucky cohesive soil obtained by the present disclosure all exhibited a desirable dispersion effect.

(28) (3) The different dispersants in Groups 5 to 10 or pure water was used in the mucky cohesive soil slurry. A soil solidifying agent accounting for 20 mass % of the improved mucky cohesive soil slurry was added into the improved mucky cohesive soil slurry. The premixed fluidized solidified soil was prepared under the joint action of the solidifying agent. The premixed fluidized solidified soil prepared by different dispersants and pure water was injected into a mold, and standard curing was conducted in a curing room at 25 C. and a relative humidity of 90% for 48 h before demolding. The curing was continued for 14 d, 28 d, 60 d, and 90 d to determine an unconfined compressive strength of the samples in each group, and the results were shown in Table 4.

(29) TABLE-US-00004 TABLE 4 Performance test results of samples prepared by different dispersants under different curing times Curing Proportion of solidifying agent day Group 5 Group 6 Group 7 Group 8 Group 9 Group 10 14 d 579.33 596.26 642.73 613.73 584.26 410.27 28 d 1542.14 1658.79 1780.46 1620.37 1567.38 1160.48 60 d 2456.79 2670.93 2759.34 2653.21 2539.47 2087.60 90 d 4691.52 4785.21 4978.51 4850.33 4739.40 4178.46

(30) It was seen from Table 4 that the unconfined compressive strength of the premixed fluidized solidified soil prepared using the dispersant for mucky cohesive soil obtained in the present disclosure met the pouring requirements of the fluidized solidified soil.

(31) The foregoing descriptions are implementation manners of the present disclosure, but are not intended to limit the protection scope of the present disclosure. Any changes and modifications made according to the technical idea of the present disclosure shall fall within the protection scope of the claims of the present disclosure.