The cement spreader plays a key role in the project, and is a comprehensive project that combines water supply, shipping, maintaining the ecosystem in the route area and other water resources utilization. The river channel project of J007-1 section of Jianghuai communication section has a total length of 1.918km. The heavy and medium silty loam distributed in the upper soil of this section has weak or medium expansibility and needs to be replaced. In the application of replacement, the surface of weak expansive soil is replaced with 1.0m thick cement modified soil perpendicular to the slope surface, and the surface of medium expansive soil is replaced with 1.5m thick cement modified soil. The expansion of expansive soil is suppressed by replacement, so as to increase the stability of engineering soil mass.
The rental service of cement spreader is provided by Shandong Xingchen Road and Bridge Engineering Co., Ltd. The design requires that if the soil used is expansive soil, its free expansion rate should be less than 65% (non expansive soil with expansion rate less than 40%). 4% cement content is recommended in the design document, but it cannot guide the detailed construction process. In order to achieve the purpose of foundation treatment, it is necessary to start with understanding the mechanism of the action of cement on expansive soil, analyze the factors that affect the quality of cement modified soil in the construction process, and take targeted solutions, so as to clearly understand the key points of quality control.
We need to have a basic understanding of expansive soil, which is also known as "expansive soil". The most prominent feature of expansive soil is that its volume expands sharply after immersion and shrinks significantly after water loss. This kind of expansion and contraction change not only has a high rate, but also is often repeated alternately with environmental changes. This is very destructive to the engineering facilities: the large settlement range leads to the collapse, deformation and landslide of the subgrade; It often causes the displacement of the building foundation, which leads to the cracking of the building; Subgrade uplift and pavement deformation have become serious engineering geological disasters. Therefore, the expansive soil foundation must be treated, and the expansive soil cannot be directly used as filler. Replacement treatment is one of the commonly used foundation treatment methods. Due to the lack of high-quality filling materials in the project site, replacement with expansive soil after improvement becomes the first choice.
Non-expansive fillers, such as sand, gravel and gravel, are often added to the expansive soil in the project, which is called physical improvement; A certain proportion of cementitious materials can also be added, which is called chemical modification. Both methods can reduce the expansion rate of the filler and increase the volume stability, so that it can meet the requirements for use as a filler. Due to the lack of high-quality fillers in this project, the cement improvement method is selected. The leasing of cement spreader is not only efficient and environmentally friendly, but also highly exciting. It is very flexible in construction. At any time and anywhere, manual spreading requires a cycle. Don't act rashly in rainy weather!
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