阅读说明：本技术 一种工程建筑渣土和泥浆固化土的液体稳定剂及其使用方法 (Liquid stabilizer for engineering building muck and mud solidified soil and use method thereof ) 是由 赵建忠 潘勇 孔锐 余启贵 邵建惠 于 2020-06-23 设计创作，主要内容包括：本发明涉及一种工程建筑渣土和泥浆固化土的液体稳定剂及其使用方法,属于修复土固化领域。按重量份计,液体稳定剂主要由30-80份的多元醇、10-70份的醇胺、1-10份的聚合物表面活性剂、1-10份的有机硼酸酯以及1-10份的杀菌剂组成。泥土、淤泥和泥浆等物料以少量水泥作为物料的胶结材料,再添加少量的液体稳定剂,所获得的修复土无侧限抗压强度大于1.5MPa,饱水稳定性不小于80％,完全满足普通道路路基结构层的无侧限抗压强度、饱水稳定性的技术指标。本发明未添加无机填料或昂贵的无机或有机物,成为一种经济型可再生利用的绿色资源。(The invention relates to a liquid stabilizer for engineering building muck and slurry solidified soil and a using method thereof, belonging to the field of repair soil solidification. The liquid stabilizer mainly comprises, by weight, 30-80 parts of polyhydric alcohol, 10-70 parts of alcohol amine, 1-10 parts of polymer surfactant, 1-10 parts of organic borate and 1-10 parts of bactericide. The materials such as soil, silt and mud use a small amount of cement as the cementing material of the materials, and then a small amount of liquid stabilizer is added, the unconfined compressive strength of the obtained repair soil is more than 1.5MPa, and the water saturation stability is not less than 80%, thus completely meeting the technical indexes of unconfined compressive strength and water saturation stability of the common road subgrade structure layer. The invention does not add inorganic filler or expensive inorganic or organic matters, and becomes an economical, renewable and recyclable green resource.)

1. A liquid stabilizer for engineering building muck and mud solidified soil is characterized in that: the disinfectant mainly comprises, by weight, 30-80 parts of polyhydric alcohol, 10-70 parts of alcohol amine, 1-10 parts of polymer surfactant, 1-10 parts of organic borate and 1-10 parts of bactericide.

2. The liquid stabilizer according to claim 1, characterized in that: the disinfectant mainly comprises, by weight, 35-75 parts of polyol, 15-65 parts of alcohol amine, 2-8 parts of polymer surfactant, 2-8 parts of organic borate and 2-8 parts of bactericide.

3. The liquid stabilizer according to claim 2, characterized in that: the disinfectant mainly comprises, by weight, 40-60 parts of polyhydric alcohol, 20-50 parts of alcohol amine, 3-5 parts of polymer surfactant, 3-5 parts of organic borate and 3-5 parts of bactericide.

4. The liquid stabilizer according to claim 1, characterized in that: the polyol is one or more selected from propylene glycol, glycerol, crude glycerol, polymerized glycerol and polymerized polyol.

5. The liquid stabilizer according to claim 1, characterized in that: the alcohol amine is selected from one or more of diethanolamine, triethanolamine, N-methyldiethanolamine, triisopropanolamine and diethanolisopropanolamine.

6. The liquid stabilizer according to claim 1, characterized in that: the polymer surfactant is selected from one or more of polyethylene glycol, polyvinyl alcohol and polyethylene oxide.

7. The liquid stabilizer according to claim 1, characterized in that: the organic boric acid ester is selected from one or more of triethanolamine borate, triethanolamine glycerol borate, triethanolamine borate ricinoleate, diglycerol borate and glycerol borate ricinoleate.

8. The liquid stabilizer according to claim 1, characterized in that: the bactericide is a morpholine derivative, and the morpholine derivative is selected from one or more of N-methylmorpholine, N-ethylmorpholine, N-methylmorpholine oxide and MBM morpholine derivative.

9. A method of using the liquid stabilizer according to any one of claims 1 to 8, wherein: firstly, dehydrating a solidified object, and reducing the water content of the solidified object to a level capable of being mechanically crushed; then adding cement which accounts for 5-10% of the weight of the cured object, and then adding the liquid stabilizer which accounts for 0.05-0.08% of the optimal water replenishing weight of the cured object; the liquid stabilizer is obtained by mixing the components in proportion and heating and stirring the mixture at the temperature of 80-120 ℃ for reaction for 2-5 hours.

10. Use according to claim 9, characterized in that: optimum water replenishing weight m_wCalculating according to the formula (1):

in the formula:

m_w-optimal water replenishing weight in g;

m_iwater content w_iMass of soil sample, unit g;

w_i-original moisture content of the soil sample;

w-optimal moisture content;

wherein, the optimal water content w refers to the corresponding water content when the soil sample obtains the maximum dry density under the heavy compaction condition.

Technical Field

The invention relates to a liquid stabilizer for repairing soil and a using method thereof.

Background

In the coastal city capital construction process, on one hand, a lot of projects generate a large amount of materials such as soil, silt and slurry, which are used as wastes and cannot be randomly stacked and poured into rivers, and how to dispose the wastes is not slow enough for coastal cities, so that the solution is urgently needed to ensure that the urban construction is harmonious and compatible with environmental protection; on the other hand, many projects require a large amount of filling soil, and excavation of a mountain is required, which may damage the mountain environment. Because of the existence of the two aspects, people imagine that if the soil, silt, slurry and the like generated by the engineering are restored into the engineering construction residue soil and slurry solidified soil and reused, the problem of no place for stacking the wastes can be solved, and the wastes can be endowed with the value of recycling.

The curing agents for the materials such as soil, silt, mud and the like used at present are various, but the powder curing agents are more, and the commonly used materials are as follows: the cement-based composite material is prepared by compounding fly ash, slag, blast furnace slag, silica fume, wollastonite, phosphogypsum, calcium carbonate, salt and alkali, various tailings and the like with cement.

According to the application requirements of the common road subgrade structure layer, the technical indexes of the engineering building muck and the slurry solidified soil are qualified as long as the unconfined compressive strength is more than 1.5MPa and the water saturation stability is more than 80%, and the cost can be greatly improved by pursuing the overhigh unconfined compressive strength instead, so that the application of the engineering building muck and the slurry solidified soil in the engineering construction field is not facilitated.

As a basic material of engineering building residue soil and slurry solidified soil, the materials such as soil, silt and slurry generally contain more clay minerals, are particularly porcelain and are not easy to stir uniformly, and even the dried soil cannot be completely powdered after being crushed. In addition, materials such as soil, silt, mud and the like often contain a small amount of organic matters and microorganisms, wherein the organic matters are not easy to be cemented, and the microorganisms are unfavorable for the later-stage stability of the restored soil. Therefore, the water stability effect of the engineering building residue soil and the slurry solidified soil obtained by directly using a small amount of cement as a consolidation material of materials such as soil, silt, slurry and the like is not ideal.

Publication No. CN109761575A discloses a curing agent suitable for TRD continuous walls, which comprises the following components: sodium lauryl polyoxyethylene ether sulfate, sulfonated oil, polyanionic cellulose, polyhydric alcohol, high-molecular polymer anionic surfactant, water, fly ash, water glass, sodium fluosilicate, cement, phosphogypsum, sulfuric acid, polyacrylamide, epoxy resin and alcohol amine. The curing agent has high compressive strength and excellent waterproof and moistureproof performances; but also can effectively modify the waste soil, the muck and the construction waste soil to be reused as the road building material. The curing agent system contains a large amount of inorganic substances and organic substances, and although the curing strength is improved, the manufacturing cost is obviously increased.

The publication No. CN111116153A discloses an inorganic composite curing agent suitable for soil bodies in coastal areas, which consists of 85 to 95 percent of main curing agent and 5 to 15 percent of additive according to mass percentage; wherein the main curing agent consists of cement and lime; the additive is composed of polyaluminium chloride, polyferric chloride, active magnesium oxide, calcium sulfate, calcium chloride and calcium carbonate. Using Al³⁺、Fe³⁺And K in mud⁺、Na⁺And carrying out displacement reaction to reduce the thickness of the double-electrode layer and promote curing reaction. In addition, the calcium salt and the magnesium salt have a micro-expansion effect, reduce the gaps in the solidified soil and enhance the compactness of the soil body, so that the water stability and the cracking performance of the solidified soil are enhanced. All the additives are inorganic substances which cannot be directly obtained from the nature, and the cost is very high.

At present, most raw materials of the curing agent are in short supply in coastal cities or are high-priced refined inorganic substances. In the curing agent, the use amount of the inorganic curing material is large, so that the control cost is very important, and the transportation cost of the raw materials with the transportation distance of more than 300 kilometers is high, so that the curing agent is not suitable for use. In terms of effect, the curing agent has good effect and high strength, but the overall cost is too high due to the fact that raw materials are not easily available or the unit price is high, and the selling price of the repair soil obtained after curing is generally difficult to bear for engineering construction units.

Disclosure of Invention

The invention aims to provide a liquid stabilizer for improving the water stability of engineering construction residue soil and slurry solidified soil which take cement as a consolidation material.

The technical scheme of the invention is that the liquid stabilizer for the engineering building residue soil and the slurry solidified soil mainly comprises 30-80 parts of polyhydric alcohol, 10-70 parts of alcohol amine, 1-10 parts of polymer surfactant, 1-10 parts of organic borate and 1-10 parts of bactericide by weight.

Preferably, the proportion of the liquid stabilizer is 35-75 parts of polyhydric alcohol, 15-65 parts of alcohol amine, 2-8 parts of polymer surfactant, 2-8 parts of organic borate and 2-8 parts of bactericide.

More preferably, the liquid stabilizer is prepared from 40-60 parts of polyalcohol, 20-50 parts of alcohol amine, 3-5 parts of polymer surfactant, 3-5 parts of organic borate and 3-5 parts of bactericide.

The following are the functions or selection bases of the components of the liquid stabilizer:

the polyalcohol is one or more selected from propylene glycol, glycerol, crude glycerine, polymerized glycerine, and polymerized polyalcohol. The polyhydric alcohol is mainly used for improving the later-period curing strength of the repair soil and ensuring the later-period stability, and when the polyhydric alcohol is less than 30 parts, the effect is poor, and when the polyhydric alcohol is more than 80 parts, the stability is reduced. Preferably 35 to 75 parts, more preferably 40 to 60 parts. When the polyhydric alcohol is a combination of two or more, the components are mixed in an arbitrary weight ratio.

The alcohol amine is one or more selected from diethanolamine, triethanolamine, N-methyldiethanolamine, triisopropanolamine, and diethanolisopropanolamine. The alcohol amine is used for improving the early curing strength of the repair soil and ensuring the early stability, and when the alcohol amine is less than 10 parts, the effect is not obvious, and when the alcohol amine is more than 70 parts, the stability is reduced on the contrary, and meanwhile, the cost is increased. Preferably 15 to 65 parts, more preferably 20 to 50 parts. When the alcohol amine is more than two compositions, the components are mixed in any weight ratio.

The polymer surfactant is one or more selected from polyethylene glycol, polyvinyl alcohol and polyethylene oxide, belongs to long-chain polymers, is beneficial to polymerization of materials such as soil, silt and mud, and improves strength. The addition amount is less than 1 part, the effect is not obvious, and more than 10 parts, the stability is reduced, and the cost is increased. Preferably 2 to 8 parts, more preferably 3 to 5 parts.

The organic borate is selected from one or more of triethanolamine borate, triethanolamine glycerol borate, triethanolamine borate ricinoleate, diglycerol borate and glycerol borate ricinoleate. The materials such as sludge, mud and the like contain a large amount of clay minerals and are extremely difficult to mix uniformly, organic borate is added to play a role in super lubrication, and in addition, the organic borate has a certain antibacterial and bactericidal effect, so that the organic borate has an inhibiting effect on microorganisms in the materials and guarantees the later-period stability of the restored soil. The addition amount is less than 1 part, the effect is not obvious, and more than 10 parts, but the stability is reduced, and the cost is increased. Preferably 2 to 8 parts, more preferably 3 to 5 parts.

The bactericide is morpholine derivative selected from one or more of N-methylmorpholine, N-ethylmorpholine, N-methylmorpholine oxide and MBM morpholine derivative. Because materials such as soil, silt, mud and the like contain microorganisms, gas can be released in the microbial propagation process to destroy the internal porosity of the repair soil, and the later-stage stability of the repair soil is greatly facilitated by adding a small amount of antibacterial bactericide. The addition amount is less than 1 part, the effect is not obvious, and the addition amount is more than 10 parts, so the cost is increased. Preferably 2 to 8 parts, more preferably 3 to 5 parts.

The application method of the liquid stabilizer comprises the following steps: firstly, dehydrating a solidified object (materials such as soil, silt, slurry and the like), and reducing the water content of the solidified object to a level capable of mechanical crushing, for example, the water content of the silt is generally reduced to below 2 percent, and during actual engineering operation, according to different sources of the solidified object, dehydrating the solidified object to a property capable of meeting mechanical crushing; then adding cement 5-10% of the weight of the cured object, and addingOptimum water replenishing weight m of curing object_w0.05-0.08% of said liquid stabilizer; the liquid stabilizer is obtained by mixing the components in proportion, heating and stirring at 80-120 ℃ for reaction for 2-5 hours, uniformly mixing the materials, wherein the reaction temperature is preferably 90-110 ℃, and the reaction time is preferably 3-4 hours.

The method for dehydrating the solidified object comprises air drying, oven drying or adding quicklime to seal the material

The above-mentioned optimum water replenishing weight m_wIs calculated according to the formula (1) to obtain:

in the formula:

m_w-optimal water replenishing weight in g;

m_iwater content w_iMass of soil sample, unit g;

w_i-original moisture content of the soil sample;

w-optimal moisture content;

wherein, the optimal water content w refers to the corresponding water content when the soil sample obtains the maximum dry density under certain compaction conditions. Different compaction conditions are adopted, the corresponding maximum dry density and the optimal water content are different, the optimal water content w obtained by a heavy compaction test is lower than that obtained by a light compaction test, and based on the fact that the soil sample is repaired soil, silt, slurry and other materials, the optimal water content w is preferably obtained by the heavy compaction test.

Compared with the prior art, the invention has the advantages that: aiming at the restoration of materials such as soil, silt, slurry and the like, a small amount of cement is firstly used as a cementing material of the materials, and a very small amount of liquid stabilizer is added, so that the unconfined compressive strength of the obtained restored soil is more than 1.5MPa, and the water saturation stability is not less than 80%. In addition, no inorganic filler or expensive inorganic or organic matters are added, the price of the repair soil is not higher than that of the residue soil, and the waste such as soil, silt, mud and the like can be truly recycled.

The engineering building muck and slurry solidified soil obtained by the invention are mainly applied to the roadbed structure layer of the common road.

Detailed Description

The present invention is described in further detail below with reference to examples, which are intended to be illustrative and not to be construed as limiting the invention.

Comparative example 1

Weighing 40 kg of sludge dry soil in a stainless steel stirring barrel, wherein the water content of the sludge dry soil is less than 2%, adding 2 kg of 425 ordinary portland cement, adding 7 kg of water, uniformly stirring, compacting under a heavy compaction standard, manufacturing 6 test blocks of 10cm multiplied by 10cm, carrying out standard maintenance for 7 days, randomly taking out 3 test blocks in the 6 th day, saturating for 1 day, and measuring unconfined compressive strength, wherein the results are shown in table 1.