Composition design of cement stabilized crushed stone mixture: Cement, fly ash, stabilized crushed stone, sand, stone chips and other road building materials are used as the cement stabilized crushed stone base. Firstly, the laboratory conducts mix design and compaction experiments through a certain number of raw material tests to determine a relatively high dry density and good moisture content. Then, a test piece is made with this ratio, and the test piece is moisturized and cured for 6 days under the specified temperature conditions. After soaking in water for 1 day, an unconfined compressive strength test is conducted. Heavy compaction test reports such as cement 4%, fly ash 10%, and graded crushed stone 86%. Coarse aggregate (1) crushed stone is produced using impact, impact or cone crushers, and secondary crushing is prohibited using crocodile crushers. The production line must be equipped with dust removal equipment for dust removal. Specification of vibrating screen mesh for crushed stone processing plant: 6mm, 11mm, 22mm, 41mm. (2) The technical indicators of crushed stone require a density greater than 2.6t/m3 and a crushing value (%) less than 25%. Cement stabilized crushed stone can serve as the base layer of the road surface.

混合料的拌和(1)拌和機械的選擇：必須選用有電子計量的拌和設備，來保證混合料的級配精度。一般采用產量大于400t／h的拌和機，以保證實際產量能滿足攤鋪能力，避免“等料”現象，縮短延遲時間。

Mixing of mixture (1) Selection of mixing machinery: Electronic metering mixing equipment must be selected to ensure the grading accuracy of the mixture. Generally, a mixer with a production capacity greater than 400t/h is used to ensure that the actual production can meet the paving capacity, avoid the phenomenon of "waiting for materials", and shorten the delay time.

(2)水穩混合料中的含水量對水穩碎石的強度及裂縫的產生有很大的影響。每天拌和前試驗人員應檢查碎石的級配、材料的含水量等，并認真填寫和下達生產配合比通知單，生產過程中，要根據天氣、氣溫、早中晚等具提因素適時調整加水量。

(2) The water content in the water stabilized mixture has a significant impact on the strength and cracking of the water stabilized crushed stone. Before mixing every day, the testing personnel should check the gradation of the crushed stone and the moisture content of the material, and carefully fill out and issue a production mix proportion notice. During the production process, the water content should be adjusted in a timely manner based on specific factors such as weather, temperature, morning, noon, and evening.

(3)水泥、集料拌和得愈均勻，水穩碎石的強度和穩定性愈高。拌和不均勻會使水泥劑量少的地方強度不足，而水泥劑量多的地方則裂縫增加。因此，在拌和過程中必須專設工程技術人員對拌和全過程進行檢查、巡視和旁站，確保混合料的含水量、水泥劑量、級配等能滿足要求，以及觀察混合料的顏色及水泥、石料的下料情況，保證拌和的順利和成功。

(3) The more evenly mixed the cement and aggregates, the higher the strength and stability of the water stabilized crushed stone. Uneven mixing will result in insufficient strength in areas with low cement dosage, while cracks will increase in areas with high cement dosage. Therefore, during the mixing process, specialized engineering and technical personnel must be assigned to inspect, patrol, and supervise the entire mixing process to ensure that the water content, cement dosage, grading, etc. of the mixture meet the requirements, as well as to observe the color of the mixture and the cutting of cement and stone materials, to ensure the smooth and successful mixing.

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