水泥穩定級配碎石（石屑）基層技術交底.doc

水泥穩定級配碎石（石屑）基層技術交底
    本施工段車行道采用厚15cm 碎石墊層，在路床檢驗合格后施工。基墊層上鋪設厚15cm4%水泥穩定石屑下基層。再在基上鋪設30cm6%水泥穩定級配碎石基層；人行道無墊層，要20cm4水泥穩定石屑層%。
一、材料
1、水泥采用普通硅酸鹽水泥、礦碴硅酸鹽水泥，終凝時間在6小時以上。要有出廠合格證和廠家的化驗報告。使用需要按規定進行檢驗；
2、碎石壓碎值不大于30%，有機質含量不超過2%，最大粒徑不超過31.5mm 不含或少含土；
3、水采用自來水。工程開工前，將擬用的材料樣品委托實驗室進行混合料組成設計，并將結果報告監理工程師審批。在未開始鋪筑水泥穩定碎石面基層至少28天前，先在監理工程師批準的地點試鋪一段800m2的試驗路段。
試驗路段試驗方案包括用不同設備類型及技術，不同的壓實方法，認真檢驗所采用的設備能滿足備料、拌和、攤鋪和壓實最合適的方案。并確實次數、層厚、含水量、干密度等，據此指導施工。
二、施工工藝
1、拌和
在現場設攪拌站，機械攪拌。先檢查水泥、碎石、石屑、水是否符合規范規定。配合比嚴格控制，確保拌和料達到最佳含水量。
2、攤鋪
按設計厚度放出橫斷面標高，分層攤鋪，攤鋪用機械進行，機械無法到達的部位，用工攤鋪，蛙式打夯機夯實。
3、碾壓
攤鋪整平后，立即碾壓。應先輕后重，先邊后中，先慢后快的原則，并在水泥終凝前完成。即先用8T壓路機碾壓2遍，再用12T壓路機碾
Cement stabilized gravel (stone chips) primary technical disclosure
    This section of roadway construction with 15cm thick gravel bedding, bed in road construction after passing inspection. Base cushion laid on the thick 15cm4% cement stabilized stone chips to the grassroots. And then to lay 30cm6% in the base of cement stabilized macadam base; sidewalk no cushion to 20cm4 Cement stone chip layer%.
One, materials
1, cement with ordinary Portland cement, mineral slag cement final setting time of 6 hours or more. Certificate and manufacturers have factory laboratory report. Use need to be tested as required;
2, gravel crushing the value of not more than 30%, organic matter content of not more than 2%, the maximum size of not more than 31.5mm or less free with soil;
3, water use tap water. Project started before the sample material will be entrusted with the laboratory Mixture Design, and report the findings supervision engineer for approval. Before the beginning of paving cement stabilized gravel surface at least 28 days before the primary, first approved by the site supervision engineer in test experiments paved a section of 800m2.
Test program includes test sections with different device types and technologies, different compaction methods, carefully test equipment used to meet the preparation, mixing, spreading and compacting the most appropriate solution. And indeed the number, thickness, water content, dry density, according to guide the construction.
Second, construction technology
1, mixing
Mixing station set up at the scene, mechanical agitation. First check the cement, gravel, stone chips, water, compliance with regulations. Mix strictly controlled to ensure optimum mixing water content material.
2, Paving
Released by the thickness of cross-sectional elevation of the design, layered paving, paving machinery to machinery can not reach the site, labor paving, frog tampers tamping.
3, RCC
Paving leveling immediately after rolling. Should light upon the weight, the first edges, the first principle of slow after the fast and completed before the final setting of cement. The first two times with 8T roller compacted, and then roller milled 12T
 

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