室内外试验基地(施)

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什么是经水泥处理的基层?

水泥处理基层(CTB)是一种 水泥土壤 describing an intimate mixture of native soils and/or manufactured aggregates with measured amounts of portland 水泥 and water that hardens after compaction and curing to form a strong, 耐用, 抗寒性为材料.  CTB is versatile as it can be either mixed in place and compacted after blending, or mixed in a central plant where it is hauled to the pla水泥 area and spread on a prepared subgrade or subbase and compacted.  A bituminous or portland 水泥 concrete wearing course is placed on top of the cured CTB to complete the pavement structure.  CTB is widely used as a pavement base for highways, 道路, 街道, 停车区域, 机场, and materials handling and storage areas. 查看或下载CTB简报.

In 水泥-treated base construction the objective is to obtain a thorough mixture of an aggregate/granular material with the correct quantity of portland 水泥 and enough water to permit maximum compaction. The completed CTB must be adequately cured to both let the 水泥 hydrate and to harden the 水泥-aggregate mixture. The fundamental control factors for quality CTB are:

  1. 适当的水泥含量
  2. 足够的水分
  3. 彻底混合
  4. 足够的压实
  5. 适当的治疗

The aggregate/granular material, 水泥, and water are typically mixed in a central mixing plant. Central plants can either be continuous-flow or batch-type pugmill mixers. CTB can also be mixed-in-place using transverse-shaft pulvermixers or traveling mixing machines.

CTB_31

The thickness of 水泥-treated Bases is less than that required for granular bases carrying the same traffic because CTB is a 水泥ed, rigid material that distributes the load over a large area. Its slab-like characteristics and beam strength are unmatched by granular bases that can fail when interlock is lost. This happens when wet subgrade soil is forced up into the base by traffic loads. Hard, rigid CTB is practically impervious. It resists cyclic freezing, rain, and spring-weather damage. 水泥-treated base continues to gain strength with age even under traffic. This reserve strength accounts in part for CTB's excellent performance.  
A stabilized base spread loads and reduces stress on the subgrade.

foundation_graphic

不稳定的细粒度的基础   
   作基础