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求问谁了解高性能混凝土配合比设计的方法？

求问谁了解高性能混凝土配合比设计的方法？

浏览：30次 | 提问时间： 07-03 04:01

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暖心情话 07-03 04:01

高性能混凝土配合比设计的方法
一、计算混凝土配制强度应按下式计算： fcu，0≥fcu，k+1.645σ 其中：σ——混凝土强度标准差(N/mm2)。取σ

生性骄纵太过专注 07-03 04:10

5.00(N/mm2)； fcu，0——混凝土配制强度(N/mm2)； fcu，k——混凝土立方体抗压强度标准值(N/mm2)，取fcu，k

等你被遗忘 07-03 04:18

20(N/mm2)；经过计算得：fcu，0

你美你魅你媚你妹 07-03 04:26

20+1.645×5.00

放不下是爱的太深还是不甘 07-03 04:35

28.23(N/mm2)。
二、水灰比计算
三、确定用水量
四、计算水泥用量
五、选定砂率、计算砂石用量
六、确定基准配合比

心似无际海洋 07-03 04:43

你好，要配制高性能混凝土方法就是按一定比例用材料配合而成，而配合的技术关键就是在配合比设计过程中两次试验调整是很重要的两个阶段，要解决好两次试验调整，必需掌握三大技术关键。
1)合理使用各种外加剂的技术，包括外加剂的选用，各种外加剂间的复合，外加剂的最佳掺量，如何达到与水泥间的相容性良好，混凝土坍落度经时损失小的要求，可先确定不同的组合，通过与水泥的相容性对比试验，进行优选，因此相容性对比试验很关键。
2)合理使用掺合料的技术，包括掺合料的选用，各种掺合料间的复合，掺合料的掺量，可选确定不同的方案，通过流动性，抗裂性，强度与耐久性对比试验，进行优选，其中流动性与抗裂性对比试验最关键。
3)卓有成效地控制混凝土开裂和防裂的技术，包括原材料选用，水化热控制，配合比参数(水胶比，用水量)的控制，施工中温度的控制，养护措施的保证等，也是先确定几种方案，通过抗裂性对比试验进行优选。

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