水穩是水穩層的簡稱，全稱為水泥穩定碎石層。水穩層是用水泥固結劑配比碎石頭，通過壓力使路面基層更結實。作為高等級路面的主要組成部分之一，水穩層能強效與路基結合，具有一定硬度，可保證公路結實度的同時節約建筑用料。水穩層需與面層良好結合，才能有足夠的平坦度和結實度，以及較好的抗水能力、穩定性及硬度。

Water stable layer is the abbreviation of water stable layer, and its full name is cement stabilized crushed stone layer. The water stable layer is a mixture of cement consolidation agent and crushed stones, which makes the pavement base more solid through pressure. As one of the main components of high-grade pavement, the water stable layer can effectively combine with the roadbed, has a certain hardness, and can ensure the firmness of the highway while saving construction materials. The water stable layer needs to be well combined with the surface layer to have sufficient flatness and firmness, as well as good water resistance, stability, and hardness.

水穩材料主要由粒料和灰漿體積組成。粒料為級配碎石，灰漿體積包括水和膠凝材料，膠凝材料由水泥和混合材料組成。水泥作為集合料的一種穩定劑，其質量對集料的質量是至關重要的，施工時選用終凝時間較長，標號較低的水泥。為使穩定土有足夠的時間進行拌和、運輸、攤鋪、碾壓以及保證其具有足夠的強度，不應使用快凝水泥、早強水泥以及受潮變質水泥。

Water stable materials are mainly composed of granular materials and mortar volume. The granular material is graded crushed stone, and the mortar volume includes water and cementitious materials. The cementitious materials are composed of cement and mixed materials. Cement, as a stabilizer of aggregates, its quality is crucial to the quality of aggregates. Cement with a longer final setting time and lower grade should be selected during construction. In order to provide sufficient time for mixing, transportation, paving, rolling and ensuring sufficient strength of the stabilized soil, fast setting cement, early strength cement, and damp deteriorated cement should not be used.

混合材料分活性和非活性兩大類。活性材料是指粉煤灰等物質，可與水泥中析出的氧化鈣作用。非活性材料是指不具有活性或活性甚低的人工或天然的礦物材料，對這類材料的品質要求是材料的細度和不含有害的成分。

Mixed materials are divided into two categories: active and inactive. Active materials refer to substances such as fly ash that can react with the precipitated calcium oxide in cement. Non active materials refer to artificial or natural mineral materials that are not active or have very low activity. The quality requirements for such materials are the fineness of the material and the absence of harmful components.

應用人工集配碎石，道路工程用做底基層時集料的最大粒徑不應超過40mm，用做基層時，集料的最大粒徑不應超過30mm。

The maximum particle size of the aggregate used for the sub base layer in road engineering should not exceed 40mm, and the maximum particle size of the aggregate used for the base layer should not exceed 30mm.

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