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.

水泥撒布车租赁服务由山东星晨路桥工程有限公司提供，设计上要求所用土料若为膨胀土，其自由膨胀率应＜65%（采用膨胀率＜40%的非膨胀土）。设计文件上推荐4%水泥掺量，但据此并不能指导施工的详细过程。为达到地基处理目的，需要从认识水泥对膨胀土作用机理入手，分析水泥改良土在施工过程中影响质量的因素，采取针对性的解决措施，以便清楚地了解质量控制重点。

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.

撒布车出租我们对膨胀土要进行基本的认识，膨胀土又称“胀缩性土”，最突出的特性是浸水后体积剧烈膨胀，失水后体积又发生显着收缩。这种胀缩变化,不但具有很高的比率,而且伴随环境变化常常反复交替进行。这种对工程设施具有很大的破坏性：沉降幅度大导致路基容易发生坍塌、变形、滑坡；常使建筑地基发生位移,因此导致房屋开裂；路基隆起、路面变形,成为严重的工程地质灾害。因此膨胀土地基必须要经过处理，膨胀土也不能直接作为填料使用。换填处理是常用的地基处理方法之一，由于本工程所在地优质填料缺乏，故使用膨胀土改良后换填成为首选方案。

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.

在工程中常往膨胀土中掺加非膨胀填料，如砂、碎石、砾石等，称之为物理改良；也可以掺加一定比例水泥类胶凝作用的材料，称之为化学改良。两种方法均可降低填料的膨胀率，增加体积稳定性，使之可以满足作为填料使用的要求。本项目由于缺乏优质填料，故选择使用水泥改良的方法。水泥撒布车租赁不但高效环保，激动性强，在施工中很灵活，随时随地，人工撒布需要周期，阴雨天气不敢轻举妄动！

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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