水穩(wěn)碎石施工中注意的問題:

　　Issues to be noted in the construction of water stable crushed stone:

　　（1）廠拌設(shè)備的選型拌和設(shè)備的質(zhì)量直接影響混合料拌和的質(zhì)量，而拌和設(shè)備的好壞的關(guān)鍵就要看其骨料、粉料、水等各種物料的配合比精度是否能夠得到保證，本標(biāo)段選用WBC300型穩(wěn)定土廠拌設(shè)備。該設(shè)備采用電磁調(diào)速控制系統(tǒng)，能較好的保證各種物料的配合比，且拌和均勻，性能穩(wěn)定。

　　(1) The selection of plant mixing equipment directly affects the quality of the mixture mixing, and the key to the quality of the mixing equipment depends on whether the accuracy of the mix proportions of various materials such as aggregates, powders, and water can be guaranteed. For this section, WBC300 stabilized soil plant mixing equipment is selected. The device adopts an electromagnetic speed control system, which can ensure the mixing ratio of various materials, and mix evenly with stable performance.

　?。?）嚴(yán)格控制水泥劑量水泥劑量太小，不能保證水泥穩(wěn)定土的施工質(zhì)量;而劑量太大，既不經(jīng)濟(jì)，還會使基層的裂縫增多、增寬，從而引起瀝青面層的相對應(yīng)的反射裂縫。所以，必須嚴(yán)格控制水泥用量，做到經(jīng)濟(jì)合理，精益求精，以確保工程質(zhì)量。

　　(2) Strictly controlling the dosage of cement is too small to ensure the construction quality of cement stabilized soil; However, excessive dosage is not only uneconomical, but also increases and widens the cracks in the base layer, thereby causing corresponding reflection cracks in the asphalt surface layer. Therefore, it is necessary to strictly control the amount of cement used, achieve economic rationality, and strive for excellence to ensure the quality of the project.

　　（3）混合料的含水量控制廠拌混合料現(xiàn)場，每天由后場專職試驗人員在早上、中午、下午分別測定各種集料的含水量，根據(jù)施工配合比設(shè)計的最佳含水量指標(biāo)，結(jié)合當(dāng)天的氣溫、濕度、運距情況確定混合料拌和時的用水量。在前場負(fù)責(zé)檢測壓實度的專職試驗人員，在混合料攤鋪整型過程中亦及時測定混合料的含水量，及時指揮壓路機(jī)碾壓，力求在最佳含水量條件下碾壓，盡量避免由于含水量過大出現(xiàn)“彈軟”、“波浪”等現(xiàn)象，影響混合料可能達(dá)到密度和強(qiáng)度，增大混合料的干縮性，使結(jié)構(gòu)層容易產(chǎn)生干縮裂縫;或由于含水量偏小使混合料容易松散，不易碾壓成型，也會影響混合料可能達(dá)到的密度和強(qiáng)度。所以只有嚴(yán)格按規(guī)范施工，加強(qiáng)每一施工環(huán)節(jié)的質(zhì)量控制，才能保證施工質(zhì)量。

　　(3) The moisture content of the mixture is controlled at the factory mixing site. The moisture content of various aggregates is measured daily by dedicated testing personnel in the back office in the morning, noon, and afternoon. Based on the optimal moisture content index designed according to the construction mix ratio, and combined with the temperature, humidity, and transportation distance of the day, the water consumption for mixing the mixture is determined. The dedicated testing personnel responsible for checking the compaction degree in the front field also timely measure the moisture content of the mixture during the paving and shaping process, command the roller to roll in a timely manner, strive to roll under the optimal moisture content conditions, and try to avoid phenomena such as "elasticity" and "waves" due to excessive moisture content, which may affect the density and strength of the mixture, increase the drying shrinkage of the mixture, and make the structural layer prone to drying shrinkage cracks; Or due to the low moisture content, the mixture is prone to looseness and difficult to roll into shape, which can also affect the density and strength that the mixture may achieve. So only by strictly following the standards of construction and strengthening the quality control of each construction process can the construction quality be guaranteed.

　　（4）減少混合料的離析混合料的運輸應(yīng)避免車輛的顛簸。在氣溫較高、運距較遠(yuǎn)時要加蓋氈布，以防止水分過分損失。攤鋪、碾壓時，攤鋪系數(shù)1.3∽1.5之間(正常速度下英格索蘭攤鋪機(jī)為1.3、徐工攤鋪機(jī)為1.5、且攤鋪系數(shù)與攤鋪機(jī)的行使速度也有關(guān))，施工中必須貫徹“寧高勿低、寧刮勿補(bǔ)”的原則， 全部施工工程力爭在水泥終凝時間前完成。碾壓完畢立即做密實度試驗，若試驗結(jié)果達(dá)不到標(biāo)準(zhǔn)重新進(jìn)行碾壓。

　　(4) Reduce the segregation of the mixture. The transportation of the mixture should avoid vehicle bumps. When the temperature is high and the transportation distance is far, it is necessary to cover it with felt cloth to prevent excessive loss of moisture. When paving and rolling, the paving coefficient should be between 1.3 and 1.5 (1.3 for Ingersoll Rand pavers and 1.5 for XCMG pavers at normal speeds, and the paving coefficient is also related to the speed of the pavers). During construction, the principle of "better high than low, better scraping than repairing" must be implemented, and all construction projects should be completed before the final setting time of cement. Immediately conduct a compaction test after compaction is completed, and if the test results do not meet the standards, re compact.

　?。?）混合料攤鋪接縫的處理接縫有縱向接縫和橫向接縫兩種，當(dāng)攤鋪機(jī)寬度足夠時，整幅攤鋪時不存在縱縫接縫問題。當(dāng)攤鋪機(jī)的攤鋪寬度不足時，采用2臺攤鋪機(jī)一前一后同步向前攤鋪混合料，并一起進(jìn)行碾壓，這樣也可以避免縱向接縫。由于本標(biāo)段結(jié)構(gòu)物較多，一般情況下都以兩結(jié)構(gòu)物間為一施工段落，避免了橫向接縫，如有特殊，需設(shè)置橫向接縫，其處理方法是將攤鋪機(jī)附近及其下面未經(jīng)壓實的混合料鏟除，將已碾壓密實且高程和平整度符合要求的末端挖成一橫向垂直向下的斷面，攤鋪機(jī)返回到壓實層的端部，用木墊板墊至虛鋪高度，再攤鋪新的混合料，繼續(xù)下一步施工。

　　(5) There are two types of joint treatment for mixed material paving: longitudinal joint and transverse joint. When the width of the paving machine is sufficient, there is no longitudinal joint problem during the entire paving process. When the paving width of the paver is insufficient, two pavers are used, one in front and one behind, to synchronously spread the mixture forward and roll it together, which can also avoid longitudinal joints. Due to the large number of structures in this section, it is generally considered as one construction section between two structures to avoid transverse joints. If there are special circumstances, transverse joints need to be set up. The treatment method is to remove the uncompacted mixture near and below the paver, excavate the end that has been compacted and meets the requirements for elevation and flatness into a transverse vertical downward section, and return the paver to the end of the compacted layer. Use wooden pads to cushion to the virtual paving height, then spread new mixture, and continue with the next step of construction.

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