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公路造价师考试真题——沥青混合料配合比材料消耗量的计算

  • 2026-08-08 00:49:41
公路造价师考试真题——沥青混合料配合比材料消耗量的计算
某段20km高速公路,路面宽度22.5m,拟加铺4cm沥青马蹄脂碎石混合料(SMA)。按设计要求,混合料油石比为7%,填料、细集料、粗集料质量分别占矿料总质量的10%、15%、75%,其中填料中矿粉和42.5级水泥各占50%,细集料全部为机制砂,粗集料为玄武岩碎石。某工程公司中标后,拟对材料成本编制预算。按企业成熟的施工管理经验和试验测定SMA压实干密度2.4t/m³,混合料的损耗为1%;场内运输及操作损耗如下:改性沥青、矿粉、42.5级水泥均为2%;机制砂、玄武岩碎石均为1%(单位质量分别为1.5t/m³、1.6t/m³ )。

问题:

1、请按预算定额中材料消耗的计算原则和办法、上述资料以及如下表格中的单价编制SMA混合料的材料成本预算。(要求写出题中消耗量的计算式,不能直接采用定额中油石比换算公式等计算材料消耗量;材料消耗数量中沥青、水泥、矿粉的计算结果保留三位小数,碎石、机制砂的计算结果保留二位小数,金额取整)

2、计算本段高速公路路面加铺的SMA材料总成本。


SMA混合材料费用计算表

SMA混合料材料消耗单位:1000m³

材料名称

单位

消耗量计算式

消耗量

单价(元)

金额(元)

改性沥青

t

5000

机制砂

120

玄武岩碎石

200

42.5级水泥

t

400

矿粉

t

150

纤维稳定

30000

材料费合价


一、首先需要了解什么是油石比,油石比和沥青含量之间如何转化。由于专业性太强,只能借助DeepSeek帮助解答,如下:

在沥青混凝土配合比设计和施工质量控制中,油石比沥青含量是两个核心但极易混淆的概念。它们的本质区别在于计算基准不同。

一、基本定义

1. 油石比指沥青质量与矿料质量(即石料、砂、矿粉等集料的总质量,不含沥青)的百分比。

  • 通俗理解: “一锅石头里掺了多少油”。它是纯粹的比例关系,直观反映沥青与石料的相对多少。

2. 沥青含量指沥青质量占沥青混合料总质量(矿料质量 + 沥青质量)的百分比。

  • 通俗理解: “整份成品里,油占了百分之几”。它反映的是沥青在最终产品中的真实占比。

二、换算关系

二者可相互换算,关键在于分母不同。

  • 由油石比求沥青含量:
注:计算时代入小数,如油石比为5%(即0.05),则沥青含量 = 0.05 / 1.05 ≈ 0.0476 = 4.76%。
  • 由沥青含量求油石比:

举例说明:假设矿料总质量为1000kg,沥青质量为50kg。

  • 油石比 = 50 / 1000 = 5.0%
  • 沥青含量 = 50 / (1000 + 50) = 50 / 1050 ≈ 4.76%

三、数值与感觉上的差异

  • 数值上: 对于同一个混合料,油石比的数值总是大于沥青含量
  • 感觉上: 平时口头说的“5个油”,在多数中国工程语境下,通常指油石比5.0%,但实际混合料的沥青含量仅为4.76%。如果误解概念,直接按5.0%的沥青含量去投料,总油量会偏多,导致路面泛油。

四、工程应用场景

1. 配合比设计阶段(多用油石比)我国《公路沥青路面施工技术规范》(JTG F40)中,最佳沥青用量的确定、马歇尔试验指标的对应横坐标,标准表述均为油石比。因为矿料级配是骨架,设计时保持矿料总量为100,以油石比为变量,逻辑清晰,便于计算各种矿料比例。

2. 施工质量控制阶段(两者并用)

  • 沥青含量是直接检测值。现场取沥青混合料样本进行离心抽提或燃烧法试验,得到的结果就是“沥青含量”。随后,技术人员需用上述公式反算出油石比,与设计值核对。
  • 拌和楼生产记录中,这两个数值通常同时显示,便于监控。但计算矿料上料比例和沥青泵送量时,基础逻辑多基于油石比。

五、特别提醒:有效沥青与吸收沥青

在更深入的分析中,还会遇到有效沥青含量这一概念,不要和上面混淆。

  • 总沥青 = 被集料表面吸附的沥青 + 填充空隙的有效沥青。
  • 只有有效沥青才对混合料的路用性能起胶结作用,而吸附的那部分成了集料的一部分。
  • 通常说配合比设计的“最佳油石比”,是针对总沥青用量而言的。

一句话总结:油石比分母是“纯石头”,体现投料比例;沥青含量分母是“成品总重”,体现产品占比。我国规范主用油石比设计,但现场实测的是沥青含量,两者必须分清并会换算。


要弄清楚油石比和沥青含量之间的转换可以简单做下数学运算,由题意知道沥青混合料油石比为7%,沥青含量=沥青质量÷沥青混合料总质量(沥青+矿料)×100%。

可以设沥青质量为a,矿料质量为b,所以(a/b)×100%=7%

沥青含量=a/(a+b)×100%,上下同时除以b得:

沥青含量=(a/b) / {(a+b)/b}×100%=7%/(1+7%)

1.改性沥青消耗量计算:

SMA混合料材料消耗单位:1000m³,SMA压实干密度2.4t/m³,混合料的损耗为1%,改性沥青场内运输及操作损耗为2%。

改性沥青消耗量:2.4×1000×1.01×{7%÷(1+7%)}×1.02=161.751 t

2.填料、细集料、粗集料质量分别占矿料总质量的10%、15%、75%,其中填料中矿粉和42.5级水泥各占50%,由于10%+15%+75%=100%,油石比为7%,所以总质量共有107份。

注:场内运输及操作损耗:矿粉、42.5级水泥均为2%;机制砂、玄武岩碎石均为1%

  • 填料:

矿粉消耗量:2.4×1000×1.01×{1÷(1+7%)}×10%×50%×1.02=115.536 t

42.5级水泥:  2.4×1000×1.01×{1÷(1+7%)}×10%×50%×1.02=115.536 t

  • 细集料:

由于机制砂的定额单位是m³,条件给出的15%是质量比,所以需要用到题目条件:机制砂单位质量为1.5t/m³进行转换。机制砂损耗为1%。

机制砂:  2.4×1000×1.01×{1÷(1+7%)}×15%×1.01÷1.5=228.81 m³

  • 粗集料:
同理

玄武岩碎石:  2.4×1000×1.01×{1÷(1+7%)}×75%×1.01÷1.6=1072.54 m³


材料名称

单位

消耗量计算式

消耗量

单价(元)

金额(元)

改性沥青

t

161.751

5000

808755

机制砂

228.81 

120

27457

玄武岩碎石

1072.54 

200

214508

42.5级水泥

t
115.536

400

46214

矿粉

t
115.536

150

17330

纤维稳定

30000

材料费合价

1144264


本段高速公路路面加铺的SMA材料总成本:

20000×22.5×0.04×1144264÷1000=20596752元

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  1. CONNECT:[ UseTime:0.001039s ] mysql:host=127.0.0.1;port=3306;dbname=www_sjds;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001586s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000713s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000634s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001328s ]
  6. SELECT * FROM `set` [ RunTime:0.000569s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001519s ]
  8. SELECT * FROM `article` WHERE `id` = 509834 LIMIT 1 [ RunTime:0.001123s ]
  9. UPDATE `article` SET `lasttime` = 1786163877 WHERE `id` = 509834 [ RunTime:0.005549s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000621s ]
  11. SELECT * FROM `article` WHERE `id` < 509834 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001030s ]
  12. SELECT * FROM `article` WHERE `id` > 509834 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001077s ]
  13. SELECT * FROM `article` WHERE `id` < 509834 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001512s ]
  14. SELECT * FROM `article` WHERE `id` < 509834 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.003247s ]
  15. SELECT * FROM `article` WHERE `id` < 509834 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.007805s ]
0.118902s