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.

水泥撒布車租賃服務由山東星晨路橋工程有限公司提供，設計上要求所用土料若為膨脹土，其自由膨脹率應＜65%（采用膨脹率＜40%的非膨脹土）。設計文件上推薦4%水泥摻量，但據(jù)此并不能指導施工的詳細過程。為達到地基處理目的，需要從認識水泥對膨脹土作用機理入手，分析水泥改良土在施工過程中影響質量的因素，采取針對性的解決措施，以便清楚地了解質量控制重點。

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.

撒布車出租我們對膨脹土要進行基本的認識，膨脹土又稱“脹縮性土”，最突出的特性是浸水后體積劇烈膨脹，失水后體積又發(fā)生顯著收縮。這種脹縮變化,不但具有很高的比率,而且伴隨環(huán)境變化常常反復交替進行。這種對工程設施具有很大的破壞性：沉降幅度大導致路基容易發(fā)生坍塌、變形、滑坡；常使建筑地基發(fā)生位移,因此導致房屋開裂；路基隆起、路面變形,成為嚴重的工程地質災害。因此膨脹土地基必須要經(jīng)過處理，膨脹土也不能直接作為填料使用。換填處理是常用的地基處理方法之一，由于本工程所在地優(yōu)質填料缺乏，故使用膨脹土改良后換填成為首選方案。

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.

在工程中常往膨脹土中摻加非膨脹填料，如砂、碎石、礫石等，稱之為物理改良；也可以摻加一定比例水泥類膠凝作用的材料，稱之為化學改良。兩種方法均可降低填料的膨脹率，增加體積穩(wěn)定性，使之可以滿足作為填料使用的要求。本項目由于缺乏優(yōu)質填料，故選擇使用水泥改良的方法。水泥撒布車租賃不但高效環(huán)保，激動性強，在施工中很靈活，隨時隨地，人工撒布需要周期，陰雨天氣不敢輕舉妄動！

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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