普通混凝土配合比设计和应用.rar

2009-9/普通混凝土配合比设计和应用.rar10-2  普通混凝土配合比设计和应用
普通混凝土配合比设计，一般应根据混凝土强度等级及施工所要求的混凝土拌合物坍落度（或工作度——维勃稠度）指标进行。如果混凝土还有其他技术性能要求，除在计算和试配过程中予以考虑外，尚应增添相应的试验项目，进行试验确认。
普通混凝土配合比设计应满足设计需要的强度和耐久性。水灰比的最大允许值，可参见表10-33。
混凝土的最大水灰比和最小水泥用量  表10-33
环境条件 结构物类别 最大水灰比 最小水泥用量（kg）
  素混凝土 钢筋混凝土 预应力混凝土 素混凝土 钢筋混凝土 预应力混凝土
1．干燥环境 •正常的居住和办公用房屋内部件 不作规定 0.65 0.60 200 260 300
2．潮湿环境 无冻害 •高湿度的室内部件
•室外部件
•在非侵蚀性土和（或）水中的部件 0.70 0.60 0.60 225 280 300
 有冻害 •经受冻害的室外部件
•在非侵蚀性土和（或）水中且经受冻害的部件
•高湿度且经受冻害的室内部件 0.55 0.55 0.55 250 280 300
3．有冻害和除冰剂的潮湿环境 •经受冻害和除冰剂作用的室内和室外部件 0.50 0.50 0.50 300 300 300
注：1．当采用活性掺合料取代部分水泥时，表中最大水灰比和最小水泥用量即为替代前的水灰比和水泥用量。
2．配制C15级及其以下等级的混凝土，可不受本表限制。
混凝土拌合料应具有良好的施工和易性和适宜
10-2 regular concrete mix design and application
Ordinary concrete mix design, the general should be based on concrete strength and construction of the required slump concrete mixture (or work degree - Weibo consistency) indicators. If there are other technical performance requirements of concrete, except in the process of calculation and test with be taken into account, the yet to be added to the appropriate pilot projects to test to confirm.
Ordinary concrete mix should be designed to meet the design requirements of strength and durability. Water-cement ratio of the maximum allowable values, See Table 10-33.
The maximum and minimum water-cement ratio of concrete cement used in scale 10-33
Environmental conditions, type of structure the minimum amount of cement maximum water-cement ratio (kg)
  Plain concrete prestressed concrete reinforced concrete plain concrete prestressed concrete reinforced concrete
1. Normal dry environment • residential and office documents are not provided for within the Housing 0.65 0.60 200 260 300
2. Humid environment of high humidity, no frost damage • indoor parts
• Outdoor Parts
• In the non-eroded soil and (or) parts water 0.60 0.60 0.70 225 280 300
 There withstand freezing freezing • outdoor components
• In the non-eroded soil and (or) of components in water and withstand freezing
• High humidity and freezing of the interior parts withstand 0.55 0.55 0.55 250 280 300
3. With freezing and de-icing agent humid environment • withstand freezing and de-icing agent role of indoor and outdoor components 0.50 0.50 0.50 300 300 300
Note: 1. When used to replace part of the active admixture of cement, the table the maximum amount of water-cement ratio and minimum cement shall be replaced before the water-cement ratio and cement content.
2. Preparation of C15 grade and below grade concrete, can not be restricted in this table.
Concrete mixing material should have good workability and suitability