混凝土强度等级检测回弹试验附砼强度换算值

1、混凝土强度等级检测（回弹试验）回弹法检测砼强度试用于工程结构普通砼抗压强度的检测。 砼强度值的确定分为如下几个步骤：1、回弹值测量2、碳化深度值测量3、回弹值计算4、砼强度的计算一、回弹值测量1、一般规定：结构或物件砼强度检测可采用下列两种方式，其适用范围及结构或构件数量应符合下列规定：（ 1）、单个检测：适用于单个结构或构件的检测。（ 2）、批量检测：适用于相同的生产工艺条件下，砼强度等级相同，原材料、配合比、成型工艺、养护条件基本一致且龄期相近的同类结构或构件，按批进行检测的结构构件。抽检数量不得少于同批构件总数的30%且不得少于 10 件。2、每一结构或构件的测区应符合下列规定：（ 1）

2、、每一结构或构件测区数量应不少于10 个。对某一方向尺寸小于 4.5米，且另一方向尺寸小于 0.3 米的构件其测区数量可适当减少，但不应少于5 个。（ 2）、相邻两测区的间距应控制在2 米以内。测区离构件端部或施工缝边缘的距离不宜大于0.5 米，且不宜小于 0.2 米。（ 3）、测区应选在使回弹仪处于水平方向检测砼浇筑侧面，当不能满足这一要求时，可使回弹仪处于非水平方向检测砼强度浇筑侧面、表面或底面。但回弹值需修正。（ 4）、测区宜选在构件的两个对称可测面上，也可选在一个可测面上，且应均匀分布。 在构件的重要部位及薄弱部位必须布置测区， 并应避开预埋件。（5）、测区的面积不宜大于0.04 m2

3、o（ 6）、检测面应为砼表面，并应清洁平整，不应有疏松层、浮浆、油垢、涂层以及蜂窝、麻面。必要时可用砂轮清除疏松层和杂物，且不应有残留的粉末或碎屑。3、回弹值测定（ 1）、检测时，回弹仪的轴线应始终垂直于结构或构件的检测面。缓慢施压，准确读数，快速复位。（ 2）、测点宜在测区范围内均匀分布。相邻两测点的净距不宜小于20mm。测点距外露钢筋、 预埋件的距离不宜小于30mm。 测点不应在气孔或外露石子上，同一测点只应弹一次，每一测区应取16 个回弹值。二、碳化深度测量值回弹值测量完毕后，应在有代表性的位置上测量碳化深度值。测点不应小于构件测区数的30%， 取其平均值为该构件的每测区的碳化深度值，当

4、碳化深度最大值与最小值之差大于2.0mm时，应在每一测区测量碳化深度。碳化深度值测量，可采用适当的工具在测区表面形成直径约15mm?L洞，其深度应大于砼的碳化深度。孔洞中的粉末和碎屑应清除干净，并不得用水擦洗。 同时， 应采用浓度为1%的酚酞酒精溶液滴在孔洞内壁的边缘处。当已碳化与未碳化界线清楚时再用深度测量工具测量已碳化与未碳化硅交界面到硅表面的垂直距离。 测量应不少于3次，取其平均值每次读数精确至0.5mm1、计算测区平均回弹值，应该从该测区的16个回弹值中剔除3个最大值和3个最小值，求余下的10个回弹值的平均值，如果是水平方向回弹浇筑硅的 侧面，该值即为该测区平均回弹值 Rm如果不足，此

5、值还需修正。非水平方向检测硅浇筑侧面时，应按下列修正： Rm=R m+Ra式中Rm% :非水平状态检测时测区的平均回弹值，精确到 0.1Ra%:非水平状态检测时回弹值修正值，可按本附表 1采用。Rm测区平均 回弹值（修正后）非水平状态检测时回弹值修正值表1检测角度+90+60+45+30-30-45-60-9020-6.0-5.0-4.0-3.0+2.5+3.0+3.5+4.030-5.0-4.0-3.5-2.5+2.5+3.0+3.5+4.040-4.0-3.5-3.0-2.0+1.5+2.0+2.5+3.050-3.5-3.0-2.5-1.5+1.0+1.5+2.0+2.5水平方向检测硅浇

6、筑顶面或底面时,应按下列修正：Rm=m+R；Rm= Rm+R式中：Rm测区修正后平士回弹值以：水平方向检测硅浇筑表面时，测区平均回弹值。R：:硅浇筑表面回弹值的修正值，见附表 2。Rm：水平方向检测硅浇注底面时，测区平均回弹值。Rb :硅浇筑底面回弹值的修正值。见附表 2当检测时回弹仪为非水平方向且测试面为非硅的浇筑侧面时。应先按附表1对回弹值进行角度修正。再按附表2对修正后的值进行浇筑面修正。即: 先修正角度，再修正浇筑面。不同浇筑面的回弹值修表2Rmm 或 Rm表面修正值(R)底面修正值(Rb)Rmm 或 Rm表面修正值(R)底面修正值(Rb)20+2.5-3.040+0.5-1.025+

7、2.0-2.5450-0.530+1.5-2.0500035+1.0-1.5四、硅强度的计算(平均强度)1、经过以上硅回弹数值测量。回弹数值修正。碳化深度测量后，可利用平均回弹修正数值(Rm及平均碳化深度(dm)，查附表3,可求得各个测区硅强度换算值2根据各个测区的硅强度换算值可计算测区硅强度平均值。当测区数为10个及以上时，应计算强度标准差，平均值及标准差应按下式计算:mfcfcunfc1 cu ii 1nsfc f fcun(fcUi)2 n(mji 1式中:mfc ：结构或构件测区硅强度换算值的平均值。 ,cun：对于单个检测的构件，取一个构件的测区数；对批量检测的构件，取被 抽检构件的

8、测区之和cfcui ：测区硅强度换算值。s篇：结构或构件测区硅强度换算值的标准差3、 结构或构件硅强度推定值（fcu,e ）的计算：结构或构件的硅强度推定值即是硅强度值，是指相应于强度换算值总体分布中保证率不低于95%勺结构或构件中的硅抗压强度值。即：查表或据测强度曲线得出的强度换算值中有95%勺值小于硅强度指定值。（1）、当该结构或构件测区数少于10个时，强度推定值取强度换算值中最小的 1 个。即 fcu,e =min（ f。）、当该结构或构件的测区强度值中出现小于10.0Mpa这个数值时，硅强度值指定值则取小于10.0Mpa。即fcu ,e 10.0Mpa这个数值一般不出现。在测强度曲线和

9、换算值表中也查不到，所以当出现硅强度换算值10.0Mpa时。硅强度推定值不用计算，直接取10.0Mpa。(3)、当该结构或构件测区数不少于10个或按批量检测时，硅强度推定值：硅强度换算值表3平均回弹平均碳化深度值dm(mm)值Rm00.511.522.533.544.555.562010.310.120.210.510.31020.410.710.510.220.61110.810.410.120.811.21110.610.32111.411.210.810.51021.211.611.41110.710.221.411.811.611.210.910.410一一一一一一一21.61211.

10、811.41110.610.2一一一一一一一21.812.312.111.711.310.810.510.1一一一一一一2212.512.211.911.51110.610.2一一一一一一22.212.712.412.111.711.210.810.410一一一一一22.41312.712.41211.41110.710.310一一一一22.613.212.912.512.111.611.210.810.410.2一一一一22.813.413.112.712.311.811.41110.610.3一一一一2313.713.41312.612.111.611.210.810.510.1一一一23

11、.213.913.613.212.812.211.811.41110.710.310一一23.414.113.813.41312.41211.611.210.910.410.2一一23.614.414.113.713.212.712.211.811.411.110.710.410.1一23.814.614.313.913.412.812.41211.511.210.810.510.2一2414.914.614.213.713.112.712.211.811.51110.710.410.124.215.114.814.313.913.312.812.411.911.611.210.910.610

12、.324.415.415.114.614.213.613.112.612.211.911.411.110.810.424.615.615.314.814.413.713.312.812.31211.511.210.910.624.815.915.615.114.61413.51312.612.211.811.411.110.72516.215.915.414.914.313.813.312.812.51211.711.310.925.216.416.115.615.114.413.913.41312.612.111.811.51125.416.716.415.915.414.714.213.7

13、13.212.912.41211.711.225.616.916.616.115.714.914.413.913.41312.512.211.811.325.817.216.916.315.815.114.614.113.613.212.712.41211.52617.517.216.616.115.414.914.413.813.51312.612.211.626.217.817.416.916.415.715.114.61413.713.212.812.411.826.41817.617.116.615.815.314.814.213.913.31312.61226.618.317.917

14、.416.816.115.61514.414.113.513.212.812.1Rm00.511.522.533.544.555.5626.818.618.217.717.116.415.815.314.614.313.813.412.912.32718.918.51817.416.616.115.514.814.61413.613.112.427.219.118.718.117.616.816.215.71514.714.113.813.312.627.419.41918.417.81716.415.915.214.914.31413.412.727.619.719.318.71817.21

15、6.616.115.415.114.514.113.612.927.82019.61918.217.416.816.315.615.314.714.213.7132820.319.719.218.417.61716.515.815.414.814.413.913.228.220.62019.518.617.817.216.71615.61514.61413.328.420.920.319.718.81817.416.916.215.815.214.814.213.528.621.220.62019.118.217.617.116.41615.41514.313.628.821.520.920.

16、219.418.517.817.316.616.215.615.214.513.82921.821.120.519.618.718.117.516.816.415.815.414.613.929.222.121.420.819.91918.317.71716.61615.614.814.129.422.421.721.120.219.318.617.917.216.816.215.81514.229.622.72221.320.419.518.818.217.51716.41615.114.429.82322.321.620.719.819.118.417.717.216.616.215.31

17、4.53023.322.621.9212019.318.617.917.416.816.415.414.730.223.622.922.221.220.319.618.918.217.61716.615.614.930.423.923.222.521.520.619.819.118.417.817.216.815.815.130.624.323.622.821.920.920.219.418.71817.5171615.230.824.623.923.122.121.220.419.718.918.217.717.216.215.43124.924.223.422.421.420.719.91

18、9.218.417.917.416.415.531.225.224.423.722.721.720.920.219.418.618.117.616.615.731.425.624.824.1232221.220.519.718.918.417.816.915.831.625.925.124.323.322.321.520.719.919.218.61817.11631.826.225.424.623.622.521.72120.219.418.918.217.316.23226.525.724.923.922.82221.220.419.619.118.417.516.432.226.926.

19、125.324.223.122.321.520.719.919.418.617.716.632.427.226.425.624.523.422.621.820.920.119.618.817.916.832.627.626.825.924.823.722.922.121.320.419.91918.11732.827.927.126.225.12423.222.321.520.620.119.218.317.23328.227.426.525.424.323.422.621.720.920.319.418.517.433.228.627.726.825.724.623.722.92221.22

20、0.519.618.717.633.428.92827.12624.92423.122.321.420.719.818.917.833.629.328.427.426.425.224.223.322.621.720.92019.11833.829.628.727.726.625.424.423.522.821.921.120.219.318.2343029.12826.825.624.623.72322.121.320.419.518.334.230.329.428.32725.824.823.923.222.321.520.619.718.4Rm00.511.522.533.544.555.

21、5634.430.729.828.627.2262524.123.422.521.720.819.818.634.631.130.228.927.426.225.224.323.622.721.9212018.834.831.430.529.227.626.425.424.523.822.922.121.220.2193531.830.829.62826.725.824.82423.222.321.420.419.235.232.131.129.928.227262524.223.422.521.620.619.435.432.531.530.228.627.326.325.424.423.7

22、22.821.820.819.635.632.931.930.62927.626.625.724.72423222119.835.833.332.33129.328272602524.323.322.221.23633.632.631.229.628.227.226.225.224.523.522.421.420.236.2343331.629.928.627.526.525.524.823.822.621.620.436.434.433.43230.328.927.926.825.825.124.122.821.820.636.634.833.832.430.629.228.227.126.

23、125.424.4232220.936.835.234.132.73129.628.527.526.425.724.623.222.221.13735.534.43331.229.828.827.726.625.924.823.422.421.337.235.934.833.431.630.229.12826.926.225.123.722.621.537.436.335.233.831.930.529.428.327.226.525.42422.921.837.636.735.634.132.330.829.728.627.526.825.724.223.12237.837.13634.53

24、2.631.23028.927.827.12624.523.422.33837.536.434.93331.530.329.228.127.426.224.823.622.538.237.936.835.233.431.830.629.528.427.726.52523.922.738.438.337.235.633.732.130.929.828.72826.825.324.12338.638.737.53634.132.431.230.12928.32725.524.423.238.839.137.936.434.432.731.530.429.328.527.225.824.623.53

25、939.538.236.734.73331.830.629.628.827.42624.823.739.239.938.5373533.332.130.829.82927.626.2252439.440.338.837.335.333.632.4313029.227.826.425.224.239.640.739.137.635.633.932.731.230.229.42826.625.424.439.841.239.63835.934.23331.430.529.728.226.825.624.74041.639.938.336.234.533.331.730.83028.42725.82

26、540.24240.338.636.534.833.63231.130.228.627.32625.240.442.440.73936.935.133.932.331.430.528.827.626.225.440.642.841.139.437.235.434.232.631.730.829.127.826.525.740.843.341.639.837.735.734.532.93231.229.428.126.8264143.74240.2383634.833.232.331.529.728.427.126.241.244.142.340.638.436.335.133.532.631.

27、83028.727.326.541.444.542.740.938.736.635.433.832.93230.328.927.626.741.64543.241.439.236.935.734.233.332.430.629.227.92741.845.443.641.839.537.23634.533.632.730.929.528.127.2Rm00.511.522.533.544.555.564245.944.142.239.937.636.334.9343331.229.828.527.542.246.344.442.640.33836.635.234.333.331.530.128

28、.727.842.446.744.84340.638.336.935.534.633.631.830.4292842.647.245.343.441.138.737.335.934.93432.130.729.328.342.847.645.743.841.43937.636.235.234.332.430.929.528.64348.146.244.241.839.43836.635.634.632.731.329.828.943.248.546.644.642.239.838.336.935.934.93331.530.129.143.4494745.142.640.238.737.236

29、.335.333.331.830.429.443.649.447.445.44340.53937.536.635.633.632.130.629.643.849.947.945.943.440.939.437.936.935.933.932.430.929.94450.448.446.443.841.339.838.337.336.334.332.831.230.244.250.848.846.744.241.740.138.637.636.634.53331.530.544.451.349.247.244.642.140.5393836.934.933.331.830.844.651.749

30、.647.64542.440.839.338.337.235.233.632.13144.852.250.14845.442.841.239.738.637.635.533.932.431.34552.750.648.545.843.241.640.13937.935.834.332.731.645.253.251.148.946.343.64240.439.438.336.234.63331.945.453.651.549.446.64442.340.739.738.636.434.833.232.245.654.151.949.847.144.442.741.1403936.835.233

31、.532.545.854.652.450.247.544.843.141.540.439.337.135.533.932.8465552.850.647.945.243.541.940.839.737.535.834.233.146.255.553.351.148.345.543.842.241.14037.736.134.433.346.45653.851.548.745.944.242.641.440.338.136.434.733.646.656.554.25249.246.344.642.941.840.738.436.73533.946.85754.752.449.646.74543

32、.342.24138.83735.334.24757.555.252.95047.245.243.742.641.439.137.435.634.547.25855.753.450.547.645.844.142.941.839.437.73634.847.458.556.253.850.94846.244.543.342.139.83836.335.147.65956.654.351.348.446.644.843.742.540.138.436.635.447.859.557.154.751.848.84745.24442.840.538.736.935.7486057.655.252.2

33、49.247.445.644.443.240.83937.23648.2一5855.752.649.647.84644.843.641.139.337.536.348.4一58.656.153.15048.246.445.143.941.539.637.836.648.6一5956.653.550.448.646.745.544.341.84038.136.948.8一59.557.15450.94947.145.944.642.240.338.437.249一6057.554.451.349.447.546.24542.540.638.837.549.2一一5854.851.749.847.

34、946.645.442.84139.137.849.4一一58.555.352.150.248.347.145.843.241.339.438.2Rm00.511.522.533.544.555.5649.6一一58.955.752.550.648.747.446.243.641.739.738.549.8一一59.456.2535149.147.846.543.94240.138.850一一59.956.753.451.449.548.246.944.342.340.439.150.2一一一57.153.851.949.948.547.244.642.640.739.450.4一一一57.654.352.350.34947.745434139.750.6一一一5854.752.750.749.44845.443.441.44050.8一一一58.555.153.151.149.848.445.743.741.740.351一一一5955.653.551.550.148.846.144.14240.751.2一一一59.4565451.950.549.246.444.442.34151.4一一一59.956.454.452.350.949.646.844.742.741.351.6一一一一56.954.852.751.3