1.1优点(1)早期强度高,短时间内(5~7天)可获提2.0MPa以上的强度。(2稳定性好;结构层本身具有一定的通透性,受水份影响较小。(3)可以根据设计需要,通过改变其组成设计,而调整所需要的强度,而其它结构层的强度则受材料本身制约较大。(4)机械化施工,质量好,进度快小段落的零星工程,可以采用简易机械或人工拌和摊铺,灵活而经济。

1.1 Advantages (1) High early strength, can achieve a strength improvement of over 2.0MPa in a short period of time (5-7 days). (2) Good stability; the structural layer itself has a certain degree of permeability and is less affected by moisture. (3) The required strength can be adjusted by changing its composition design according to design needs, while the strength of other structural layers is greatly constrained by the material itself. (4) Mechanized construction, with good quality and fast progress, can be used for sporadic projects with simple machinery or manual mixing and paving, which is flexible and economical.

1.2缺点⑴)强度形成以后易产生干缩裂缝,裂缝是水泥稳定碎石主要病害之一能够引起上面层的开裂,而导致雨季时路基浸水,引起路堤早期破坏,缩短路的使用寿命。(2)施工时易离析。(3)强度形成后在车轮等外力作用下,表面易被剥落、磨耗。(4)延迟时间短,即从拌和到碾压成型要在较短的时间内完成,要求施工节奏紧凑,对设备临时故障要有预防措施,以免造成材料浪费。(5)一般虚铺厚度大,碾压对平整度有不良影响。

1.2 Disadvantages (1) After the strength is formed, it is easy to produce shrinkage cracks. Cracks are one of the main diseases of cement stabilized crushed stone, which can cause cracks in the upper layer and lead to roadbed flooding during the rainy season, causing early damage to the embankment and shortening the service life of the road. (2) It is prone to segregation during construction. (3) After the formation of strength, the surface is prone to peeling and wear under external forces such as wheels. (4) The delay time is short, which means that the process from mixing to compaction should be completed in a relatively short time. The construction rhythm should be compact, and preventive measures should be taken for temporary equipment failures to avoid material waste. (5) Generally, the thickness of virtual paving is large, and rolling has a negative impact on the flatness.

2水泥稳定碎石作用原理

Principle of cement stabilized crushed stone action

水泥稳定碎石是以级配碎石作骨料,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。它的初期强度高,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。水稳水泥用量一般为混合料3%~7%,7天的无侧限抗压强度可达1.5%~4.0%MPa,较其他路基材料高。水稳成活后遇雨不泥泞,表面坚实,是高级路面的理想基层材料。

Cement stabilized crushed stone is made of graded crushed stone as aggregate, and a certain amount of cementitious material and sufficient mortar volume are used to fill the gaps in the aggregate according to the principle of embedding and compaction. Its compactness is close to compactness, and its strength mainly relies on the interlocking principle between crushed stones, while having sufficient mortar volume to fill the gaps in the aggregates. Its initial strength is high, and its strength increases rapidly with age, forming a plate, thus having high strength, good impermeability, and frost resistance. The dosage of water stable cement is generally 3%~7% of the mixture, and the unconfined compressive strength after 7 days can reach 1.5%~4.0% MPa, which is higher than other roadbed materials. After being stable in water, it does not get muddy in rain and has a solid surface, making it an ideal base material for advanced road surfaces.

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