1.1優(yōu)點(1)早期強度高,短時間內(nèi)(5~7天)可獲提2.0MPa以上的強度。(2穩(wěn)定性好;結(jié)構(gòu)層本身具有一定的通透性,受水份影響較小。(3)可以根據(jù)設(shè)計需要,通過改變其組成設(shè)計,而調(diào)整所需要的強度,而其它結(jié)構(gòu)層的強度則受材料本身制約較大。(4)機械化施工,質(zhì)量好,進度快小段落的零星工程,可以采用簡易機械或人工拌和攤鋪,靈活而經(jīng)濟。

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缺點⑴)強度形成以后易產(chǎn)生干縮裂縫,裂縫是水泥穩(wěn)定碎石主要病害之一能夠引起上面層的開裂,而導(dǎo)致雨季時路基浸水,引起路堤早期破壞,縮短路的使用壽命。(2)施工時易離析。(3)強度形成后在車輪等外力作用下,表面易被剝落、磨耗。(4)延遲時間短,即從拌和到碾壓成型要在較短的時間內(nèi)完成,要求施工節(jié)奏緊湊,對設(shè)備臨時故障要有預(yù)防措施,以免造成材料浪費。(5)一般虛鋪厚度大,碾壓對平整度有不良影響。

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水泥穩(wěn)定碎石作用原理

Principle of cement stabilized crushed stone action

水泥穩(wěn)定碎石是以級配碎石作骨料,采用一定數(shù)量的膠凝材料和足夠的灰漿體積填充骨料的空隙按嵌擠原理攤鋪壓實。其壓實度接近于密實度,強度主要靠碎石間的嵌擠鎖結(jié)原理,同時有足夠的灰漿體積來填充骨料的空隙。它的初期強度高,并且強度隨齡期而增加很快結(jié)成板體,因而具有較高的強度,抗?jié)B度和抗凍性較好。水穩(wěn)水泥用量一般為混合料3%~7%,7天的無側(cè)限抗壓強度可達1.5%~4.0%MPa,較其他路基材料高。水穩(wěn)成活后遇雨不泥濘,表面堅實,是高級路面的理想基層材料。

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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