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高强混凝土配合比设计有什么要求?_其他_设计456问答
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高强混凝土配合比设计有什么要求?

浏览:24次 | 提问时间: 08-06 08:21
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4个答案
像个笑话般爱你 08-06 08:22

高强混凝土配合比设计主要应满足以下要求:1满足结构设计和施工进度要求的混凝土强度等级。2保证混凝土拌和物具有良好的工作性,以满足施工条件的要求。3保证混凝土具有良好的耐久性,满足抗冻、抗渗、抗腐蚀等要求,从而使混凝土达到经久耐用的使用目的。4在保证上述质量和施工方便的前提下,尽量节约水泥,合理使用原材料,从而降低工程成本,取得良好的经济效益。               *高强混凝土:  ①要精选水泥、骨料等各项原材料;  ②必须要掺用高效减水剂,以降低用水量和水灰比;  ③要掺用优质的矿物掺合料,以改善水泥石和界面区的微结构,提高致密性和胶结强度;  ④要仔细选择配合比,确定合理的砂率和水灰比,以降低水泥用量并提高}昆凝土的强度;  ⑤要严格控制施工质量,做好早期养护。  只有综合采取以上技术措施,才可能实施高强混凝土的有效*。  高强混泥土简介:一般把强度等级为C60及其以上的混凝土称为高强混凝土,C100强度等级以上的混凝土称为超高强混凝土。它是用水泥、砂、石原材料外加减水剂或同时外加粉煤灰、F矿粉、矿渣、硅粉等混合料,经常规工艺生产而获得高强的混凝土。

心慈则貌美 08-06 08:30

1.*高强混凝土所用原材料应符合下列规定:(1)应选用质量稳定、强度等级不低于42.5级的硅*盐水泥或普通硅*盐水泥。(2)对强度等级为C60级的混凝土,其粗骨料的最大粒径不应大于31.5mm,对强度等级高于C60级的混凝土,其粗骨料的最大粒径不应大于25mm;针片状颗粒含量不宜大于5.0%,含泥量不应大于0.5%,泥块含量不宜大于0.2%;其他质量指标应符合现行行业标准《普通混凝土用碎石或卵石质量标准及检验方法》(JGJ   53)的规定。(3)细骨料的细度模数宜大于2.6,含泥量不应大于2.0%,泥块含量不应大于0.5%。其他质量指标应符合现行行业标准《普通混凝土用砂质量标准及检验方法》(JGJ   52)的规定。(4)*高强混凝土时应掺用高效减水剂或缓凝高效减水剂;并应掺用活性较好的矿物掺合料,且宜复合使用矿物掺合料。2.高强混凝土配合比的计算方法和步骤除应按本章规定进行外,尚应符合下列规定:(1)基准配合比中的水灰比,可根据现有试验*选取;(2)*高强混凝土所用砂率及所采用的外加剂和矿物掺合料的品种、掺量,应通过试验确定;(3)高强混凝土的水泥用量不应大于550kg/m3;水泥和矿物掺合料的总量不应大于600kg/m3。3.高强混凝土配合比的试配与确定的步骤应按本章的规定进行。当采用三个不同的配合比进行混凝土强度试验时,其中一个应为基准配合比,另外两个配合比的水灰比,宜较基准配合比分别增加和减少0.02~0.03。4.高强混凝土设计配合比确定后,尚应用该配合比进行不少于6次的重复试验进行验证,其平均值不应低于*强度。

入耳凉意 08-06 08:39

高强混凝土配合比设计有什么要求:提供个配比参考,每方混凝土用   C(52.5PO水泥):367.5Kg   F(一级粉煤灰)   :73.5Kg   K/G(矿粉或硅粉):49Kg   W(水)   :142Kg   W/C

伴入眠 08-06 08:47

0.29   砂率根据地材而定(最好控制在35左右)   减水剂用减水率在30%(以产量为1%来计算)

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