概率混凝土配合比设计工具
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体积计算器
您需要多少混凝土？计算矩形、圆形和梯形浇筑的体积、重量和袋数。
配合比计算器
使用 BRE 配合比设计方法获取目标强度等级的水泥、砂、骨料和水的比例。
强度预测器
28 天抗压强度的蒙特卡洛模拟。查看完整分布，而非仅一个点估计。
成本优化器
找到满足您强度目标和所需置信水平的最经济配合比。包含区域定价。
为什么采用概率方法？
真实混凝土是变化的。您获得的强度取决于数十个因素——水灰比精度、水泥批次变异性、养护条件、骨料质量。确定性计算器只给您一个数字和虚假的信心。我们的工具运行蒙特卡洛模拟，向您展示可能结果的完整分布，使您能够按实际需要的裕度进行设计。
Understanding Concrete Mix Design
混凝土配合比设计是选择水泥、水、细骨料（砂）和粗骨料（碎石或卵石）比例以达到目标抗压强度、工作性和耐久性的过程。水灰比（w/c 比）是决定强度的最重要因素：较低的比值可产生更强、渗透性更低的混凝土，但会降低工作性。
传统的配合比设计方法，如 BRE（建筑研究院）方法和 ACI 211，提供确定性配方——针对给定强度等级的一组固定比例。然而在实践中，混凝土的实际强度会因原材料变异性、配料精度、搅拌均匀性、运输时间、浇筑技术和养护条件的不同而批次间变化。
概率配合比设计通过将每个不确定输入建模为分布而非固定值来应对这一现实。蒙特卡洛模拟从这些分布中抽取数千个随机样本，对每种组合运行强度模型，并生成可能结果的直方图。这使工程师能够指定特征强度（95% 的批次将超过的第 5 百分位值）和置信水平，而不是依赖单一确定性估计加上任意安全裕度。
常见问题
- How much concrete do I need?
- Multiply the length, width, and depth of your pour in metres to get volume in cubic metres. Add 5–10% for waste. Our Volume Calculator handles rectangular, circular, and trapezoidal shapes and converts to bag counts automatically.
- What is the water-to-cement (w/c) ratio?
- The w/c ratio is the mass of water divided by the mass of cement in a concrete mix. It is the single most important factor governing compressive strength: lower ratios produce stronger concrete but reduce workability. Typical structural mixes use w/c ratios between 0.40 and 0.55.
- What is characteristic strength?
- Characteristic strength (fck) is the compressive strength value below which no more than 5% of test results are expected to fall. It accounts for the natural variability of concrete production and is the basis for structural design codes such as Eurocode 2 and IS 456.
- How does curing temperature affect concrete strength?
- Higher curing temperatures accelerate early hydration, increasing 1–7 day strength, but can reduce ultimate 28-day strength due to non-uniform hydration product formation. The Nurse-Saul maturity method models this relationship using a temperature-time factor to predict strength gain at any temperature.
- What is the difference between OPC, PPC, and PSC?
- OPC (Ordinary Portland Cement) is general-purpose cement. PPC (Portland Pozzolana Cement) blends OPC with fly ash for improved durability and lower heat of hydration. PSC (Portland Slag Cement) uses ground granulated blast furnace slag and offers excellent sulfate resistance. Each type affects the rate of strength gain and final strength.