阅读说明：本技术 一种新型地下工程固化材料 (Novel underground engineering curing material ) 是由 虞佰先 曹伟男 于 2019-11-06 设计创作，主要内容包括：本发明公开了一种新型地下工程固化材料,包括固化剂,固化剂为粉末物理混合体,固化剂成分包括超细颗粒材料EWEC材料、粉煤灰、矿渣、脱硫渣、纤维材料；固化剂通过加水搅拌与细颗粒软土混合后能形成高效结晶水化物。该固化剂可以广泛用于基坑软弱土体加固、止水帷幕、路基换填、复合地基项目中,通过利用工业矿渣、粉煤灰等废料,降低材料成本,减少环境污染。(The invention discloses a novel underground engineering curing material, which comprises a curing agent, wherein the curing agent is a powder physical mixture, and the curing agent comprises an ultrafine particle material EWEC material, fly ash, slag, desulfurization slag and a fiber material; the curing agent is mixed with fine-particle soft soil by adding water and stirring to form high-efficiency crystalline hydrate. The curing agent can be widely applied to projects of foundation pit soft soil body reinforcement, waterproof curtains, roadbed replacement and filling and composite foundation, and reduces material cost and environmental pollution by utilizing waste materials such as industrial slag, fly ash and the like.)

1. A novel underground engineering curing material comprises a curing agent and is characterized in that the curing agent is a powder physical mixture, and the curing agent comprises an ultrafine particle material EWEC material, fly ash, slag, desulfurized slag and a fiber material; the curing agent is mixed with fine-particle soft soil by adding water and stirring to form high-efficiency crystalline hydrate.

2. The novel underground engineering solidifying material of claim 1, wherein the EWEC material comprises limestone, clay, iron ore powder, and further comprises humic acid, sodium carbonate, sodium fluoride, sodium hydroxide, aluminum potassium sulfate, triethanolamine, and sulfamate inorganic compound.

3. The novel underground engineering curing material as claimed in claim 2, wherein the curing agent comprises the following components in percentage by weight: 20-70% of slag, 5-30% of desulfurized slag, 5-20% of fly ash, 5-10% of EWEC and 1-15% of excitant and fiber.

4. The novel underground engineering curing material as claimed in claim 3, wherein the curing agent is mixed with water to form slurry, and the water-cement ratio is 1: 0.5-2.0, stirring the slurry and the soil, wherein the specific surface area of gel particles generated by EWEC hydration is 10 ten thousand times larger than that of original cement particles, and the permeability coefficient of the formed reinforced soil is 1.5 times that of a cement soil consolidation body with the same doping amount.

Technical Field

The invention relates to the technical field of civil engineering, in particular to a novel underground engineering curing material.

Background

In many soft soil foundations, roadbeds, tunnels and underground projects, soil body curing agents are adopted to carry out corresponding treatment on the original foundations so as to meet engineering requirements, for example, in roadbed projects and multi-layer buildings, the bearing capacity of the original foundations cannot meet the requirements, and the original foundations are generally reinforced by methods of forming composite foundations by curing agents or mixing, replacing and filling and the like, so that the bearing capacity of the foundations is improved so as to meet engineering design requirements; in foundation pit engineering, a soil body curing agent and an in-situ soil body are stirred to form a waterproof curtain, a gravity type retaining wall and reinforce soft soil bodies in a pit, and the soil body curing agent plays an important role in modern engineering construction and is widely used.

Since the 20 th century, some economically developed countries have adopted soil body reinforcement technology to improve soil bodies in the fields of municipal engineering, ports and the like, and good engineering and economic benefits are obtained. Through technological development for many years, soil improvement technologies in countries such as the United states, the Japan and the Germany have been developed to deep new materials, namely soil curing agents, such as ISS curing agents, Qiji soil curing agents, Aught-set and Palma soil curing enzymes from 'single raw materials such as lime, cement and fly ash', and the materials are widely applied to the fields of roads, civil engineering, environmental protection and the like. However, soil curing agents are introduced in 90 s in the 20 th century in China, and on the basis of the experience of digestion and absorption in foreign countries, some soil curing agent products are developed, so that the technology in the field of underground engineering materials in China is enriched, and technical support is provided for the construction of foundation soil replacement and filling, saline soil treatment, foundation pit backfilling and the like.

Soil body curing agents are roughly classified into three categories: an ionic soil curing agent, a biological enzyme curing agent and a hydration curing agent. The hydration curing agent is widely applied to engineering projects in China, and generally adopts materials such as lime, cement-fly ash, lime-fly ash and the like as soil body curing agents, and is applied to projects such as foundation soil replacement, construction cushion, cured ground, road base, foundation pit backfill and the like. However, the reinforcement formed by the common cement, lime, fly ash and the like has some weaknesses:

the stirring is uneven, the amount of hydration products is small, and the hydration products are discontinuously distributed, which is the main reason that the reinforcing effect of the cement curing agent in the clay is not ideal;

1) the strength of the reinforced body is not high, and particularly in mucky soil, the strength can only reach 0.2-0.5 MPa generally, and the doping amount is increased frequently;

2) the crack resistance is poor, and cracks and fractures are easy to occur;

3) the early strength is slowly increased, and is particularly prominent in mucky soil;

4) if the clay meets the cohesive soil, the clay is difficult to stir uniformly, and the water stop effect is not ideal;

5) the economy is not necessarily reasonable.

Aiming at some weaknesses of the hydrated curing agent, the project mainly aims to research a novel underground engineering material and combine the characteristics of soft clay and mucky soil to develop an economic curing agent with high early strength, good tensile property and high impermeability

Disclosure of Invention

The invention aims to solve the technical problem of overcoming the problems in the prior art and providing a novel underground engineering curing material.

In order to achieve the purpose, the technical scheme adopted by the patent is as follows:

a novel underground engineering curing material comprises a curing agent, wherein the curing agent is a powder physical mixture, and the curing agent comprises an ultrafine particle material EWEC material, fly ash, slag, desulfurized slag and a fiber material; the curing agent is mixed with fine soft soil particles by adding water and stirring to form high-efficiency crystallized hydrate.

The EWEC material mainly comprises limestone, clay and iron ore powder, and is added with humic acid, sodium carbonate, sodium fluoride, sodium hydroxide, aluminum potassium sulfate, triethanolamine and amino sulfonate inorganic compounds.

The curing agent comprises the following components in percentage by weight: 20-70% of slag, 5-30% of desulfurized slag, 5-20% of fly ash, 5-10% of EWEC and 1-15% of excitant and fiber.

The curing agent is added with water and stirred to prepare slurry, and the water-cement ratio is 1: 0.5-2.0, stirring the slurry and the soil, wherein the specific surface area of gel particles generated by EWEC hydration is 10 ten thousand times larger than that of original cement particles, and the permeability coefficient of the formed reinforced soil is 1.5 times that of a cement soil consolidation body with the same doping amount.

Has the advantages that: the curing agent can be widely applied to projects of foundation pit soft soil body reinforcement, waterproof curtains, roadbed replacement and filling and composite foundation, and reduces material cost and environmental pollution by utilizing waste materials such as industrial slag, fly ash and the like.

Detailed Description

In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further explained below.

In order to solve the problems of slow increase of early strength of a reinforced body, low overall strength, poor crack resistance and the like in the prior art, a soil body hardening agent suitable for a soft soil area is provided, and the optimal proportion of materials is researched. Based on the solidification mechanism of the soft soil, the soil body solidifying agent is a powder mixture, and is composed of an ultrafine particle material EWEC (playing a role similar to cement), fly ash, slag and desulfurized slag as main materials, a fiber material is added in an auxiliary manner, and the ultrafine particle soft soil is mixed by adding water and stirring to form efficient crystallized hydrate, so that the early strength and the crack resistance are improved, the strength of a reinforced body reaches more than 2Mpa, and the permeability coefficient reaches 10-8cm/s magnitude.

The main scheme is as follows:

(1) raw material selection: the cement is replaced by 'EWEC' (the main components of the 'EWEC' are limestone, clay and iron ore powder, and the inorganic compounds of the humic acid, sodium carbonate, sodium fluoride, sodium hydroxide, potassium aluminum sulfate, triethanolamine and sulfamate are added, so that the cement has higher water resistance and soil affinity and high early strength than the cement), industrial wastes such as slag, coal ash and the like, and fiber materials;

(2) the proportion of the curing agent is as follows: in order to find out the optimal matching proportion, three proportions are selected for testing, and a group is set to take the cement curing agent as reference.

The first proportioning: 20-70% of slag, 5-30% of desulfurized slag, 5-20% of fly ash, 2-5% of EWEC, 1-15% of excitant and fiber are adopted;

the second proportioning: 20-70% of slag, 5-30% of desulfurized slag, 5-20% of fly ash, 5-10% of EWEC, 1-15% of excitant and fiber are adopted;

and a third proportioning: 20-70% of slag, 5-30% of desulfurized slag, 5-20% of fly ash, 10-20% of EWEC, 1-15% of excitant and fiber are adopted;

reference ratio: 20-70% of slag, 5-30% of desulfurized slag, 5-20% of fly ash, 5-10% of cement and 1-15% of excitant are adopted;

(3) and (4) indoor test: mixing curing agent materials with different proportions with a standard soil sample, respectively carrying out compaction test, infinite pressure test, penetration test and tensile test, and recording a reinforced body strength-time curve;

(4) and (3) field test: according to the optimal mixing proportion of the curing agent in the indoor test, carrying out a field stirring pile test, and verifying the mixing proportion and the engineering performance of the curing agent;

(5) the research conclusion is that: through indoor tests and field tests, the optimal mixing ratio of the curing agent materials is researched: 20-70% of slag, 5-30% of desulfurized slag, 5-20% of fly ash, 5-10% of EWEC and 1-15% of excitant and fiber are adopted. The curing agent is prepared by physically mixing EWEC, slag and fly ash, adding water and stirring to prepare slurry (the water-cement ratio is 1: 0.5-2.0) and stirring with soil, wherein due to a series of chemical and physical reaction effects of ion exchange, gel hardening, carbonization and the like, the uniaxial compressive strength of a reinforcing body is more than 1.5 times of that of water-cement soil doped with the reinforcing body, the specific surface area of gel particles generated by hydration of the EWEC is about 10 ten thousand times larger than that of original cement particles, the permeability coefficient of the formed reinforcing soil body is more than 1.5 times of that of a cement soil solidified body doped with the same amount, and the tensile resistance of the reinforcing body is remarkably improved by adding the tensile fibers, so that the industrial slag and the fly ash can replace the original cement doped amount, and the engineering cost.

The building foundation treated by the method has the advantages of high bearing capacity, small deformation, extremely low permeability, utilization of waste materials, low construction cost and environmental protection.

The underground engineering curing agent developed by the embodiment is mixed with an in-situ soil body to form a reinforced body, the strength of the reinforced body in 28 days can reach 2MPa, the permeability coefficient reaches 10-8cm/s magnitude, the tensile strength is greater than 0.8MPa, and each index of the reinforced body is far higher than that of the existing cement curing agent material, and because the mixing amount of 'EWEC' in a new material is reduced and fly ash and industrial waste materials are added, the cost of the reinforced body is reduced by about 20% compared with the cement curing agent with the same index.

The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only for the purpose of illustrating the principles of the present invention, but that various changes and modifications may be made without departing from the spirit and scope of the invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.