Chinese liquid soil stabilizer, rock forming agent, road solidification
Rammed earth wall solidification agent rammed earth technology rammed earth wall solidification agent rammed earth wall
Adding cement Type A soil stabilizer
JUSTSOLID ® technology manual
I . Product introduction
1.1 Definition of soil stabilizer
Soil stabilizer is a new type of environmental protection curing material, which acts directly on the soil to solidify the soil into a dense, uniform, high strength and durable composite stabilized soil layer.
Composite stabilized soil is a semi-rigid material formed by new engineering material soil stabilizer and soil stabilization. Compared with the commonly used inorganic combined stabilized materials, the composite stabilized soil can achieve local materials, and has the characteristics of convenient construction, short construction period, low cost and excellent technical indicators for road use. In a certain range, it can replace the commonly used gravel, crushed stone, reduce the amount of lime and other inorganic binding materials, thus reducing the project cost, saving resources, saving energy, and conducive to ecological environmental protection. This technology is used in the construction and repair of composite stabilized soil subbase and base of new and reconstructed highway engineering, as well as pavement construction, wall construction and repair of different purposes. It has broad application prospects in municipal, transportation, water conservancy, foundation treatment and other projects.
1.2 Classification of soil stabilizer
In CJJ/T286-2018 Technical Standard for the Application of Soil Solidifying Agent, the soil solidification agent is divided into Class A soil solidification agent and Class B soil solidification agent.
Class A soil stabilizer: a powder or liquid additive that can improve the engineering performance of the foundation soil by physical or chemical reaction with cement (or lime and other cementitious materials), soil, water and air after being added into the soil.
Class B soil stabilizer: after being added into the soil, it is a soil stabilizer that can be used alone through the physical or chemical reaction with soil, water and air, not mixed with cement (or lime and other cementitious materials), and a powder additive that can improve the engineering performance of the foundation soil.
II. Physical and chemical properties
Form: liquid or granular powder Solubility: soluble in water
Type: ionic polymer type biological enzyme type Safety: ecological and environmental protection
III. Action mechanism
The working principle of composite stabilized soil is to make the surface current of soil micelle reduce energy and fix a large amount of free water in the soil in the form of crystal water. The engineering properties of the soil are changed by a series of physical and chemical reactions after the soil stabilizer is mixed with the soil. The particles tend to agglomerate, the electrolyte concentration increases, and the volume expands to further fill the soil pores; Under the action of compaction, the whole structure is formed to make the solidified soil easy to be compacted and stable, reach the compactness that cannot be achieved by conventional methods, and improve its strength, compactness, modulus of resilience, deflection value, CBR, shear strength and other properties, so as to meet the requirements of road technical indicators.
IV.Adaptability and scope of use
Soil stabilizer can be applied to a variety of soil properties, such as clay, silt and sand; Mineral powder, slag, construction waste, etc. According to different soil properties, different curing schemes are formulated by adjusting the material ratio.
1. Subgrade construction
The subbase of the expressway is hardened, and the base and subbase of the first class road and below are hardened. Hardening of base course and surface course of simple road or temporary road. Cement soil, soft soil and soft foundation solidification.
2. Site hardening
Hardening treatment of parking lot, road, stockyard, storage yard, drilling well pad, production and processing yard, etc.
3. Rammed earth wall
Vegetable, flower and breeding greenhouse; Construction or repair of ancient building walls; Earth wall of folk houses, etc.
4. Making unburned bricks
After fully mixing the clay with the soil curing agent, it is supplemented with other hydraulic materials and directly pressed by the brick press.
V. Construction plan
5.1 Basic Requirements
① Cementitious material: cement. It shall comply with the current national standard General Portland Cement (GB175). Cement of the same grade, brand, variety and delivery shall not be mixed. Cement grade 425 and above. The initial setting period is required to be more than 3 hours, and the final setting period is about 6 hours, not more than 10 hours.
②Water quality requirements: the water shall be non-polluting water (potable water for livestock). It conforms to the current industrial standard Standard for Concrete Water JGJ 63.
③ Construction thickness: the compaction thickness of each layer should be 15-20 cm (cm), and the total compaction thickness should be determined according to the construction requirements.
④ Addition of cementitious materials: the amount of cementitious materials generally accounts for 3% - 6% of the total soil amount. The details shall be determined according to the construction requirements and process.
⑤ Amount of soil stabilizer: about 0.5 kg per cubic meter of compacted earth; It is about 0.03% (three thousandths) of the mixture by weight. Curing agent for sealing layer: after curing, spray on the surface of solidified soil, dilute with water about 20 times, and spray the sealing layer.
⑥ Moisture determination method:
Figure1 Soil moisture meter Figure2 Traditional simple method
Use a soil moisture meter or traditional simple method: grab a handful of soil, put it in your hand and hold it tightly, and the soil mass will be formed without scattering; One meter from the ground, let the soil mass fall freely, and the soil mass spread evenly (fall to the ground and blossom), indicating that the moisture content is about 15%.
⑦ Material consumption:
For example, the area of the soil to be solidified is calculated as 5 square meters, the thickness is 20 cm, and the total volume is 1 cubic meter after compaction. The density after compaction is calculated as 2 tons/cubic meter, and the total volume is 2 tons.
*Earthwork=area * thickness=5 square meters * 0.2 meters=1 cubic meter * Total soil volume=earthwork * compaction density=1 * 2=2 tons;
*Amount of cementitious material (cement)=total soil quantity * 10%=2 * 10%=0.2 tons；
*Amount of soil stabilizer=total earthwork * amount of soil stabilizer=1 m3 * 0.5 kg/m3=0.5 kg;
*Water consumption of diluting and curing agent=(optimum moisture content * total solid content) - (initial soil moisture content * total soil content)
=18% * (soil volume+cement+diluted water) - 12% * total soil volume
Note: In the formula, the initial water content of soil is calculated as 12%, and the optimum water content is calculated as 18%; The specific construction shall be subject to the actual water content.
