對(duì)原材料的控制

Control of raw materials

碎石

Gravel

要嚴(yán)格控制碎石級(jí)配，以保證原材料的穩(wěn)定性。碎石最好是定山廠、定篩孔尺寸，建議山場(chǎng)破碎機(jī)采用35mm、22mm、6mm的篩孔規(guī)格。碎石的壓碎值≦30%，硫酸鹽含量＜0.25%。

Strictly control the gradation of crushed stones to ensure the stability of raw materials. It is best to use a fixed mountain factory and a fixed sieve size for crushed stones. It is recommended that the mountain crusher use sieve sizes of 35mm, 22mm, and 6mm. The crushing value of crushed stone is ≤ 30%, and the sulfate content is<0.25%.

水泥

cement

水泥應(yīng)采用初凝時(shí)間3小時(shí)以上和終凝時(shí)間較長(zhǎng)（宜在6小時(shí)以上）的水泥，不得使用快硬水泥、早強(qiáng)水泥和受潮變質(zhì)的水泥，宜采用標(biāo)號(hào)32.5#，經(jīng)檢驗(yàn)安定性合格的水泥。 若采用散裝水泥，散裝水泥進(jìn)場(chǎng)入罐時(shí)，出爐天數(shù)大于7天，且安定性滿(mǎn)足要求；入罐溫度不高于50℃，若高于50℃必須使用時(shí)，應(yīng)采取降溫措施。

Cement should be used with an initial setting time of more than 3 hours and a longer final setting time (preferably more than 6 hours). Fast hardening cement, early strength cement, and cement that has deteriorated due to moisture should not be used. Cement with a grade of 32.5 # and passing the stability test should be used. If bulk cement is used, when the bulk cement enters the tank, the number of days it is discharged from the furnace is greater than 7 days, and its stability meets the requirements; The temperature inside the tank shall not exceed 50 ℃. If it exceeds 50 ℃ and must be used, cooling measures shall be taken.

粉煤灰

Fly ash

粉煤灰中SiO2 .Al2O3 和Fe2O3 的總含量應(yīng)大于70%，燒失量小于20%，比表面積大于2500cm2 ∕g（或90%通過(guò)0.3mm篩孔，

SiO2 in fly ash The total content of Al2O3 and Fe2O3 should be greater than 70%, the loss on ignition should be less than 20%, and the specific surface area should be greater than 2500cm2/g (or 90% through a 0.3mm sieve),

通過(guò)0.075mm篩孔）。對(duì)于濕粉煤灰其含水量不超過(guò)35%，含水量過(guò)大時(shí)，粉煤灰易凝聚成團(tuán)，造成拌和困難。如進(jìn)場(chǎng)含水量偏大，可采用打堆、翻曬等措施，降低含水量。 1.4水

Passing through a 0.075mm sieve. For wet fly ash, its moisture content does not exceed 35%. When the moisture content is too high, fly ash is prone to agglomerate, causing mixing difficulties. If the moisture content on site is too high, measures such as stacking and flipping can be taken to reduce the moisture content. 1.4 Water

凡是飲用水均可使用。

All drinking water can be used.

混合料組成設(shè)計(jì)

Mix composition design

進(jìn)行混合料組成設(shè)計(jì)時(shí)，應(yīng)先確定碎石合成比例，水泥、粉煤灰采用外比。

When designing the composition of the mixture, the proportion of crushed stone synthesis should be determined first, and the external ratio of cement and fly ash should be used.

確定混合料最佳含水量、最大干密度。

Determine the optimal moisture content and maximum dry density of the mixture.

根據(jù)混合料的最佳含水量、最大干密度制備無(wú)側(cè)限抗壓強(qiáng)度試件，在規(guī)范規(guī)定的溫度下保濕養(yǎng)生6天，浸水24小時(shí)后進(jìn)行無(wú)側(cè)限抗壓強(qiáng)度試驗(yàn)，無(wú)側(cè)限抗壓強(qiáng)度代表值應(yīng)大于或等于4MPA。嚴(yán)禁用增加水泥劑量來(lái)提高

Prepare unconfined compressive strength specimens based on the optimal moisture content and maximum dry density of the mixture, and maintain moisture for 6 days at the specified temperature. After 24 hours of immersion, conduct unconfined compressive strength tests. The representative value of unconfined compressive strength should be greater than or equal to 4MPA. It is strictly prohibited to increase the dosage of cement to improve

無(wú)側(cè)限抗壓強(qiáng)度，因?yàn)樗鄤┝看笕菀资孤访婊鶎赢a(chǎn)生干、溫縮等非荷載裂縫；徐海公路S323TA1標(biāo)的配合比設(shè)計(jì)充分考慮了這一點(diǎn)，采用1%的粉煤灰替代水泥以降低結(jié)構(gòu)層的收縮性。

Unconfined compressive strength, as a large amount of cement can easily cause non load cracks such as dryness and thermal shrinkage in the pavement base layer; The mix design of the S323TA1 section of Xuhai Highway fully considers this and uses 1% fly ash instead of cement to reduce the shrinkage of the structural layer.

根據(jù)試拌、擊實(shí)試驗(yàn)以及試鋪來(lái)驗(yàn)證混合料的最大干密度，最終確定最大干密度和最佳含水量。

Verify the maximum dry density of the mixture based on trial mixing, compaction tests, and trial laying, and ultimately determine the maximum dry density and optimal moisture content.

水泥穩(wěn)定碎石施工質(zhì)量控制要點(diǎn)

Key points for quality control of cement stabilized crushed stone construction

施工過(guò)程中的質(zhì)量控制要點(diǎn)

Key points of quality control during the construction process

拌和過(guò)程中的質(zhì)量控制

Quality control during the mixing process

（1）應(yīng)配備產(chǎn)量大于400T/H的拌和機(jī)，拌和機(jī)至少要有五個(gè)進(jìn)料斗，應(yīng)配置2個(gè)50T的水泥罐或1個(gè)80～100T的水泥罐，并配有大容量的儲(chǔ)水箱。所有料斗、水箱和水泥罐應(yīng)配備高精度電子計(jì)量器，并經(jīng)有資質(zhì)的計(jì)量部門(mén)進(jìn)行標(biāo)定后方可使用。

(1) A mixer with a production capacity greater than 400T/H should be equipped. The mixer should have at least five feeding hoppers, and should be equipped with two 50T cement tanks or one 80-100T cement tank, as well as a large capacity water storage tank. All hoppers, water tanks, and cement tanks should be equipped with high-precision electronic meters and calibrated by qualified metrology departments before use.

（2）工程技術(shù)人員應(yīng)在每天開(kāi)始拌和前，檢查料場(chǎng)內(nèi)各材料的含水量，計(jì)算當(dāng)天的施工配合比，外加水與天然含水量之和要比最佳含水量略高，并根據(jù)天氣、氣溫、早中晚等具體因素適時(shí)調(diào)整加水量。 （3）必須專(zhuān)設(shè)工程技術(shù)人員對(duì)混合料進(jìn)行檢測(cè)和控制，拌和過(guò)程中每小時(shí)至少檢查一次混合料的含水量、水泥劑量（特殊情況隨時(shí)檢查）。每個(gè)工作日上、下午至少檢查一次混合料的級(jí)配，出現(xiàn)問(wèn)題及時(shí)向技術(shù)負(fù)責(zé)人匯報(bào)，不得擅自處理。

(2) Engineering and technical personnel should check the moisture content of each material in the material yard before starting mixing every day, calculate the construction mix ratio for that day, and adjust the water content in a timely manner based on specific factors such as weather, temperature, morning, middle, and evening. The sum of external water and natural water content should be slightly higher than the optimal water content. (3) Special engineering and technical personnel must be assigned to inspect and control the mixture. During the mixing process, the moisture content and cement dosage of the mixture must be checked at least once an hour (special circumstances can be checked at any time). Check the gradation of the mixture at least once every working day in the morning and afternoon, and report any problems to the technical manager in a timely manner. Unauthorized handling is not allowed.

（4）在拌和過(guò)程中為了有效控制混合料的含水量、水泥劑量，在拌缸處指定專(zhuān)人觀察混合料的顏色及水泥下料情況，確保含水量、水泥劑量準(zhǔn)確，嚴(yán)禁將不合格的混合料運(yùn)到攤鋪現(xiàn)場(chǎng)。

(4) In order to effectively control the moisture content and cement dosage of the mixture during the mixing process, a dedicated person is designated at the mixing tank to observe the color of the mixture and the cement cutting situation, ensuring accurate moisture content and cement dosage. It is strictly prohibited to transport unqualified mixtures to the paving site.

（5）拌和場(chǎng)負(fù)責(zé)人與攤鋪現(xiàn)場(chǎng)負(fù)責(zé)人應(yīng)保持聯(lián)系，隨時(shí)通報(bào)彼此運(yùn)轉(zhuǎn)情況，以便對(duì)方采取相應(yīng)措施。

(5) The person in charge of the mixing plant and the person in charge of the paving site should maintain contact and keep each other informed of their operation status at any time, so that the other party can take corresponding measures.

（6）設(shè)專(zhuān)人記錄每車(chē)料的拌和時(shí)間、出廠時(shí)間，以此作為前臺(tái)收料攤鋪的依據(jù)

(6) Assign a dedicated person to record the mixing time and factory delivery time of each vehicle's materials, which will serve as the basis for front-end material collection and paving

運(yùn)輸過(guò)程中的質(zhì)量控制

Quality control during transportation

（1）運(yùn)送混合料的車(chē)輛應(yīng)采用大噸位的自卸車(chē)，并且數(shù)量滿(mǎn)足施工要求，以保證拌和攤鋪的連續(xù)性和均勻性。

(1) The vehicles transporting the mixture should use heavy-duty dump trucks, and the quantity should meet the construction requirements to ensure the continuity and uniformity of mixing and paving.

（2）運(yùn)送混合料的車(chē)輛應(yīng)配備覆蓋混合料的帆布或彩條布，嚴(yán)禁混合料暴曬。接料時(shí)車(chē)輛應(yīng)前后移動(dòng)，避免混合料產(chǎn)生離析。

(2) Vehicles transporting mixtures should be equipped with canvas or colored cloth covering the mixture, and it is strictly prohibited for the mixture to be exposed to sunlight. When receiving materials, the vehicle should move forward and backward to avoid segregation of the mixture.

（3）應(yīng)采取預(yù)防措施及時(shí)處理拋錨車(chē)輛，保證運(yùn)輸車(chē)輛處于完好狀態(tài)，及時(shí)、安全、迅速地把混合料運(yùn)到攤鋪現(xiàn)場(chǎng)，運(yùn)輸時(shí)間超過(guò)30分鐘作廢料處理

(3) Preventive measures should be taken to promptly deal with anchored vehicles, ensuring that the transport vehicles are in good condition. The mixture should be transported to the paving site in a timely, safe, and rapid manner. If the transportation time exceeds 30 minutes, it should be treated as waste

攤鋪過(guò)程中的質(zhì)量控制

Quality control during the paving process

攤鋪水泥穩(wěn)定碎石基層前應(yīng)將作業(yè)面內(nèi)的軟土、浮土、積水等清除干凈，同時(shí)將作業(yè)面內(nèi)的表面灑水濕潤(rùn)。

Before paving the cement stabilized crushed stone base, the soft soil, floating soil, accumulated water, etc. inside the working surface should be cleaned up, and the surface inside the working surface should be moistened with water.

檢查攤鋪機(jī)各部分運(yùn)轉(zhuǎn)情況，確保攤鋪機(jī)處于良好狀態(tài)。 (3)根據(jù)攤鋪計(jì)劃提前做好路肩培土，并設(shè)專(zhuān)人維持交通，確保交通安全。

Check the operation of each part of the paver to ensure that it is in good condition. (3) According to the paving plan, prepare the shoulder soil in advance and assign a dedicated person to maintain traffic to ensure traffic safety.

攤鋪時(shí)應(yīng)采用兩臺(tái)功能一致的攤鋪機(jī)進(jìn)行梯隊(duì)攤鋪，兩臺(tái)攤鋪機(jī)梯隊(duì)作業(yè)時(shí)應(yīng)相距5～8米。無(wú)超高路段先攤鋪邊部，前一攤鋪機(jī)邊部走鋼絲，中部走移動(dòng)梁，后一臺(tái)攤鋪機(jī)中部走已攤鋪好的水泥穩(wěn)定碎石基層，邊部走鋼絲。兩臺(tái)攤鋪機(jī)要均速協(xié)調(diào)作業(yè)，攤鋪厚度、松鋪系數(shù)、振動(dòng)頻率、行進(jìn)速度等要保持一致。合理控制攤鋪速度（1臺(tái)400t/h拌和機(jī)作業(yè)時(shí)速度為1.1m/min）。攤鋪現(xiàn)場(chǎng)應(yīng)嚴(yán)格杜絕“車(chē)機(jī)互等”現(xiàn)象：即既不能因攤鋪機(jī)等運(yùn)輸車(chē)而影響已鋪好段面的壓實(shí)；也不能讓車(chē)輛長(zhǎng)時(shí)間的閑置等待攤鋪增加延遲時(shí)間，前后場(chǎng)應(yīng)協(xié)調(diào)作業(yè)、步調(diào)一致

When paving, two pavers with the same function should be used for staggered paving, and the distance between the two pavers during staggered operation should be 5-8 meters. For non super high road sections, the edge should be paved first. The first paver should use steel wires on the edge and a moving beam in the middle. The second paver should use the already paved cement stabilized crushed stone base in the middle and steel wires on the edge. The two pavers should coordinate their operations at an equal speed, with consistent paving thickness, loose paving coefficient, vibration frequency, and travel speed. Reasonably control the paving speed (when one 400t/h mixer is operating, the speed is 1.1m/min). The paving site should strictly prevent the phenomenon of "vehicle machine interaction": that is, the compaction of the already laid section should not be affected by the paving machine and other transportation vehicles; Vehicles should not be left idle for a long time to increase the delay time for paving, and the front and rear fields should coordinate operations and keep pace with each other

攤鋪過(guò)程中應(yīng)嚴(yán)格控制基層厚度和高程，確保橫坡度滿(mǎn)足設(shè)計(jì)要求，為確保攤鋪的平整度，攤鋪機(jī)在進(jìn)行攤鋪時(shí)應(yīng)嚴(yán)格按照試驗(yàn)路確定的攤鋪速度勻速連續(xù)攤鋪，嚴(yán)禁一會(huì)快，一會(huì)慢。

During the paving process, the thickness and elevation of the base layer should be strictly controlled to ensure that the cross slope meets the design requirements. In order to ensure the smoothness of the paving, the paver should strictly follow the paving speed determined by the test road and continuously pave at a uniform speed. It is strictly prohibited to fast and slow at one time.

專(zhuān)人記錄每車(chē)料開(kāi)始攤鋪時(shí)的樁號(hào)、開(kāi)始攤鋪的時(shí)間以及攤鋪終了時(shí)的樁號(hào)和攤鋪結(jié)束的時(shí)間，并記錄攤鋪機(jī)停止攤鋪的時(shí)間。

A dedicated person shall record the pile number at the beginning of each vehicle's material paving, the starting time of paving, the pile number at the end of paving, and the end time of paving, and record the time when the paving machine stops paving.

現(xiàn)場(chǎng)施工人員認(rèn)真檢查攤鋪的均勻性，對(duì)局部出現(xiàn)的蜂窩現(xiàn)象及時(shí)進(jìn)行處理。

The on-site construction personnel carefully inspect the uniformity of the paving and promptly deal with local honeycomb phenomena.

每天施工結(jié)束后的工作縫采用整齊后直接碾壓和再施工時(shí)用切縫機(jī)切齊等方法進(jìn)行處理，并安排專(zhuān)人埋植工作縫標(biāo)記樁。

After the completion of construction every day, the work joints shall be treated by direct rolling after being neat and using a cutting machine to cut them even during construction, and a dedicated person shall be arranged to bury the marked piles for the work joints.

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