• 联系人:小马师傅
  • 电话:18560041881
  • 地址:济南市北园大街86号
新闻中心当前位置:首页-新闻中心
    来源:http://www.jndmzp.com/   时间:
    济南自流平讲解如何测试混凝土基面强度
    来源:http://www.jndmzp.com   时间:2015-4-16 11:53:49
    1、注意混凝土回弹值的修正在运用回弹法检测混凝土强度时,必须要事先了解到施工单位浇注混凝土的方式,并注意修正,因为泵送混凝土流动性大,粗骨料粒径较小,砂率增加,混凝土的砂浆包裹层偏厚,采用回弹法按测区混凝土强度换算值表推定的测区混凝土温度值将明显低于其实际强度值。济南自流平http://www.jndmzp.com/
    1, pay attention to the rebound value of concrete in the inspection of concrete strength by rebound correction method, must know in advance to the concrete pouring construction units, and pay attention to correct, because the pumping concrete fluidity big, coarse aggregate particle size, increase the rate of sand, mortar coating layer of concrete by rebound method based on the partial thickness. Concrete compressive strength of test area temperature conversion value of concrete measure table of presumption is obviously lower than the actual value of the intensity values.
    2、注意回弹法检测的适用条件必须注意回弹法的使用前题是要求被测混凝土的内外质量基本一致,当混凝土表层与内部质量有明显差异,如遭受化学腐蚀、火灾、冻伤,或内部存在缺陷时,不能直接采用回弹法检测混凝土强度。
    2, pay attention to the applicable conditions of the rebound method to test the rebound method must pay attention to the use case requires the measured concrete internal and external quality is basically the same, when there are significant differences on the surface and internal quality, such as chemical corrosion, fire, suffering from frostbite, defects or internal, not to test the strength of concrete by rebound method.
    3、测区选择要正确检测构件布置测区时,相邻两测区的间距应控制在2m以内,测区离构件端部或施工缝边缘的距离不宜大于0.5m且不宜小于0.2m;测区应选在使回弹仪处于水平方向检测混凝土浇筑面,并选在对称的两个可测面上,如果不能满足这一要求时,也可选在一个可测面上,但一定要分布均匀。
    3, test area to choose correct detection component arrangement of measuring area, distance between two adjacent sensing area should be controlled within 2m, measured from the end components or construction joint edge distance should not be greater than 0.5m and not less than 0.2m; test area should be selected in the rebound instrument in the horizontal direction detection of concrete surface, and the symmetry two can be measured on the surface, if you can not meet this requirement, also available in a measurable surface, but must be evenly distributed.
    4、回弹仪的标准状态应是在洛氏硬度HRC为60±2的标准钢砧上,垂直向下弹击三次,其平均率定值应为80±2,否则回弹仪必须进行调整或校验。
    Standard 4, rebound instrument should be in the Rockwell hardness of HRC 60 + standard steel anvil 2, vertical downward impact three times, the average rate of value should be 80 + 2, or rebound tester must be adjusted or check.
    5、用于回弹检测的混凝土构件,表面应清洁、平整,不应有疏松层、浮浆、油垢、蜂窝、麻面。在检测时经常遇到麻面或有浮浆的构件,回弹前必须有砂轮磨平,否则结果偏低。在测试面达到清洁、平整的前提下,还需注意混凝土表层是否干燥,混凝土的含水率会影响其表面的硬度,混凝土在水泡之后会导致其表面硬度降低。
    5, for the concrete rebound test, surface should be clean, smooth, no loose layer, mud, grease, honeycomb, surface voids. Pits or component laitance is often encountered in the test, there must be removed before grinding wheel rebound, otherwise the result is low. To clean and smooth the premise in the test surface, also need to pay attention to the concrete surface is dry, the moisture content of the concrete will affect the surface hardness, surface hardness of concrete can lead to the decrease in water after.
    因此,混凝土表面的湿度对回弹法检测影响较大,对于潮湿或浸水的混凝土,须待其表面干燥后再进行测试。建议采用自然干燥的方式。禁止采用热火、电源强制干燥,以防混凝土面层被灼伤,影响检测精度。
    Therefore, the concrete surface humidity had great effect on the rebound method to test for wet or water, concrete, is subject to the surface dry and then test. Recommend the use of natural drying method. The prohibition of the use of heat, power forced drying, in order to prevent the concrete surface burns, affecting the accuracy of detection.

鲁公网安备 37148202000237号