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水泥稳定碎石是一种常用的半刚性基层材料
定义:
definition:
水泥稳定碎石是在具有一定级配的碎石中掺入足量的水泥和水,经拌和得到的混合料在压实和养生后,当其强度符合规定的要求时,称为水泥稳定碎石。它具有良好的板体性,水稳性和抗冻性比石灰稳定土好。
Cement stabilized crushed stone is a mixture obtained by adding sufficient amounts of cement and water to crushed stone with a certain grading. After compaction and curing, when its strength meets the specified requirements, it is called cement stabilized crushed stone. It has good board properties, better water stability and frost resistance than lime stabilized soil.
作用原理:
Working principle:
水泥稳定碎石以级配碎石作骨料,采用一定数量的胶凝材料和足够的灰浆体积填充骨料的空隙,按嵌挤原理摊铺压实。其压实度接近于密实度,强度主要靠碎石间的嵌挤锁结原理,同时有足够的灰浆体积来填充骨料的空隙。初期强度高,并且强度随龄期而增加很快结成板体,因而具有较高的强度,抗渗度和抗冻性较好。
Cement stabilized crushed stone is made of graded crushed stone as aggregate, filled with a certain amount of cementitious material and sufficient mortar volume to fill the gaps in the aggregate, and spread and compact according to the principle of interlocking. Its compaction degree is close to that of compactness, and its strength mainly relies on the interlocking principle between crushed stones, while having sufficient mortar volume to fill the voids of the aggregate. The initial strength is high, and the strength increases quickly with age to form a board, thus having high strength, good impermeability and frost resistance.
材料要求:
Material requirements:
水泥:作为集合料的一种稳定剂,其质量对集料的质量至关重要。施工时选用终凝时间较长,标号较低的水泥,一般采用32.5水泥即可。
Cement: As a stabilizer for aggregates, its quality is crucial to the quality of the aggregates. During construction, use cement with a longer final setting time and lower grade, generally 32.5 cement is sufficient.
混合材料:混合材料分活性和非活性两大类。活性材料是指粉煤灰等物质,可与水泥中析出的氧化钙作用。
Mixed materials: Mixed materials are divided into two categories: active and inactive. Active materials refer to substances such as fly ash that can react with the precipitated calcium oxide in cement.
技术规范:
Technical specifications:
材料:水泥稳定碎石混合料用集料的技术指标必须满足一定的标准,如压碎值、表观相对密度、吸水率、坚固性等。
Material: The technical indicators of aggregates used in cement stabilized crushed stone mixtures must meet certain standards, such as crushing value, apparent relative density, water absorption, and strength.
混合料组成设计:包括一般规定、强度要求、混合料推荐级配范围及技术要求、目标配合比设计技术要求、生产配合比设计技术要求。
Mixture composition design: including general regulations, strength requirements, recommended gradation range and technical requirements for the mixture, technical requirements for target mix design, and technical requirements for production mix design.
施工:涉及施工准备、混合料生产和运输、试验段的铺筑、混合料摊铺、混合料碾压等。
Construction: involves construction preparation, production and transportation of mixtures, paving of test sections, paving of mixtures, compaction of mixtures, etc.
养生、交通管制、层间处理:包括养生方式、交通管制、水泥稳定碎石材料层之间的处理、水泥稳定碎石基层与沥青面层之间的处理、水泥稳定碎石基层收缩裂缝的处理。
Health preservation, traffic control, and interlayer treatment: including health preservation methods, traffic control, treatment between cement stabilized crushed stone material layers, treatment between cement stabilized crushed stone base and asphalt surface layer, and treatment of shrinkage cracks in cement stabilized crushed stone base.
施工质量标准与控制:包括材料检测、铺筑试验段、质量管理、检查验收。
Construction quality standards and control: including material testing, paving test sections, quality management, inspection and acceptance.
应用:
Application:
水泥稳定碎石用于高级路面或者半刚性基层,具有施工便捷、成本低、强度高等优点,在公路工程施工中得到广泛应用。
Cement stabilized crushed stone is widely used in highway engineering construction due to its advantages of convenient construction, low cost, and high strength for high-grade pavement or semi-rigid base.
特点:
characteristic:
强度:水泥用量一般为混合料的3%~7%,7天的无侧限抗压强度可达1.5~4.0MPa,较其他路基材料高。
Strength: The cement content is generally 3% to 7% of the mixture, and the unconfined compressive strength after 7 days can reach 1.5 to 4.0 MPa, which is higher than other roadbed materials.
稳定性:成活后遇雨不泥泞,表面坚实,是高级路面的理想基层材料。
Stability: After survival, it does not become muddy in the rain and has a solid surface, making it an ideal base material for advanced road surfaces.
以上总结了水泥稳定碎石的定义、作用原理、材料要求、技术规范、应用和特点,这些信息有助于了解水泥稳定碎石的基本信息和施工标准。
The above summarizes the definition, working principle, material requirements, technical specifications, applications, and characteristics of cement stabilized crushed stone. This information helps to understand the basic information and construction standards of cement stabilized crushed stone.
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