混凝土强度等级检测(回弹试验)附砼强度换算值

混凝土强度等级检测(回弹试验)附砼强度换算值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：回弹值测量2、碳化深度值测量3、回弹值计算4、砼强度的计算回弹值测量一般规定：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）、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水平方向检测砼浇筑顶面或底面时，应按下列修正：Rm=+Rm=+式中：Rm:测区修正后平均回弹值：水平方向检测砼浇筑表面时，测区平均回弹值。：砼浇筑表面回弹值的修正值，见附表2。：水平方向检测砼浇注底面时，测区平均回弹值。：砼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砼的浇筑侧面时。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2或表面修正值()底面修正值()或表面修正值()底面修正值()20+2.5-3.040+0.5-1.025+2.0-2.5450-0.530+1.5-2.0500035+1.0-1.5四、砼强度的计算（平均强度）1、经过以上砼回弹数值测量。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,可求得各个测区砼强度换算值。2根据各个测区的砼强度换算值可计算测区砼强度平均值。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：，式中：：结构或构件测区砼强度换算值的平均值。n：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，取被抽检构件的测区之和。：测区砼强度换算值。：结构或构件测区砼强度换算值的标准差。结构或构件砼强度推定值（）的计算：结构或构件的砼强度推定值即是砼强度值，是指相应于强度换算值总体分布中保证率不低于95%的结构或构件中的砼抗压强度值。即：查表或据测强度曲线得出的强度换算值中有95%的值小于砼强度指定值。（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=min()(2)、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，砼强度值指定值则取小于10.0Mpa。即<10.0Mpa这个数值一般不出现。在测强度曲线和换算值表中也查不到，所以当出现砼强度换算值<10.0Mpa时。砼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，砼强度推定值：砼强度换算值表3平均回弹值平均碳化深度值dm(mm)Rm00.511.522.533.544.555.562010.310.1———————————20.210.510.310——————————20.410.710.510.2——————————20.61110.810.410.1—————————20.811.21110.610.3—————————2111.411.210.810.510————————21.211.611.41110.710.2————————21.411.811.611.210.910.410———————21.61211.811.41110.610.2———————21.812.312.111.711.310.810.510.1——————2212.512.211.911.51110.610.2——————22.212.712.412.111.711.210.810.410—————22.41312.712.41211.41110.710.310————22.613.212.912.512.111.611.210.810.410.2————22.813.413.112.712.311.811.41110.610.3————2313.713.41312.612.111.611.210.810.510.1———23.213.913.613.212.812.211.811.41110.710.310——23.414.113.813.41312.41211.611.210.910.410.2——23.614.414.113.713.212.712.211.811.411.110.710.410.1—23.814.614.313.913.412.812.41211.511.210.810.510.2—2414.914.614.213.713.112.712.211.811.51110.710.410.124.215.114.814.313.913.312.812.411.911.611.210.910.610.324.415.415.114.614.213.613.112.612.211.911.411.110.810.424.615.615.314.814.413.713.312.812.31211.511.210.910.624.815.915.615.114.61413.51312.612.211.811.411.110.72516.215.915.414.914.313.813.312.812.51211.711.310.925.216.416.115.615.114.413.913.41312.612.111.811.51125.416.716.415.915.414.714.213.713.212.912.41211.711.225.616.916.616.115.714.914.413.913.41312.512.211.811.325.817.216.916.315.815.114.614.113.613.212.712.41211.52617.517.216.616.115.414.914.413.813.51312.612.211.626.217.817.416.916.415.715.114.61413.713.212.812.411.826.41817.617.116.615.815.314.814.213.913.31312.61226.618.317.917.416.816.115.61514.414.113.513.212.812.1Rm00.511.522.533.544.555.5626.818.618.217.717.116.415.815.314.614.313.813.412.912.32718.918.51817.416.616.115.514.814.61413.613.112.427.219.118.718.117.616.816.215.71514.714.113.813.312.627.419.41918.417.81716.415.915.214.914.31413.412.727.619.719.318.71817.216.616.115.415.114.514.113.612.927.82019.61918.217.416.816.315.615.314.714.213.7132820.319.719.218.417.61716.515.815.414.814.413.913.228.220.62019.518.617.817.216.71615.61514.61413.328.420.920.319.718.81817.416.916.215.815.214.814.213.528.621.220.62019.118.217.617.116.41615.41514.313.628.821.520.920.219.418.517.817.316.616.215.615.214.513.82921.821.120.519.618.718.117.516.816.415.815.414.613.929.222.121.420.819.91918.317.71716.61615.614.814.129.422.421.721.120.219.318.617.917.216.816.215.81514.229.622.72221.320.419.518.818.217.51716.41615.114.429.82322.321.620.719.819.118.417.717.216.616.215.314.53023.322.621.9212019.318.617.917.416.816.415.414.730.223.622.922.221.220.319.618.918.217.61716.615.614.930.423.923.222.521.520.619.819.118.417.817.216.815.815.130.624.323.622.821.920.920.219.418.71817.5171615.230.824.623.923.122.121.220.419.718.918.217.717.216.215.43124.924.223.422.421.420.719.919.218.417.917.416.415.531.225.224.423.722.721.720.920.219.418.618.117.616.615.731.425.624.824.1232221.220.519.718.918.417.816.915.831.625.925.124.323.322.321.520.719.919.218.61817.11631.826.225.424.623.622.521.72120.219.418.918.217.316.23226.525.724.923.922.82221.220.419.619.118.417.516.432.226.926.125.324.223.122.321.520.719.919.418.617.716.632.427.226.425.624.523.422.621.820.920.119.618.817.916.832.627.626.825.924.823.722.922.121.320.419.91918.11732.827.927.126.225.12423.222.321.520.620.119.218.317.23328.227.426.525.424.323.422.621.720.920.319.418.517.433.228.627.726.825.724.623.722.92221.220.519.618.717.633.428.92827.12624.92423.122.321.420.719.818.917.833.629.328.427.426.425.224.223.322.621.720.92019.11833.829.628.727.726.625.424.423.522.821.921.120.219.318.2343029.12826.825.624.623.72322.121.320.419.518.334.230.329.428.32725.824.823.923.222.321.520.619.718.4Rm00.511.522.533.544.555.5634.430.729.828.627.2262524.123.422.521.720.819.818.634.631.130.228.927.426.225.224.323.622.721.9212018.834.831.430.529.227.626.425.424.523.822.922.121.220.2193531.830.829.62826.725.824.82423.222.321.420.419.235.232.131.129.928.227262524.223.422.521.620.619.435.432.531.530.228.627.326.325.424.423.722.821.820.819.635.632.931.930.62927.626.625.724.72423222119.835.833.332.33129.328272602524.323.322.221.23633.632.631.229.628.227.226.225.224.523.522.421.420.236.2343331.629.928.627.526.525.524.823.822.621.620.436.434.433.43230.328.927.926.825.825.124.122.821.820.636.634.833.832.430.629.228.227.126.125.424.4232220.936.835.234.132.73129.628.527.526.425.724.623.222.221.13735.534.43331.229.828.827.726.625.924.823.422.421.337.235.934.833.431.630.229.12826.926.225.123.722.621.537.436.335.233.831.930.529.428.327.226.525.42422.921.837.636.735.634.132.330.829.728.627.526.825.724.223.12237.837.13634.532.631.23028.927.827.12624.523.422.33837.536.434.93331.530.329.228.127.426.224.823.622.538.237.936.835.233.431.830.629.528.427.726.52523.922.738.438.337.235.633.732.130.929.828.72826.825.324.12338.638.737.53634.132.431.230.12928.32725.524.423.238.839.137.936.434.432.731.530.429.328.527.225.824.623.53939.538.236.734.73331.830.629.628.827.42624.823.739.239.938.5373533.332.130.829.82927.626.2252439.440.338.837.335.333.632.4313029.227.826.425.224.239.640.739.137.635.633.932.731.230.229.42826.625.424.439.841.239.63835.934.23331.430.529.728.226.825.624.74041.639.938.336.234.533.331.730.83028.42725.82540.24240.338.636.534.833.63231.130.228.627.32625.240.442.440.73936.935.133.932.331.430.528.827.626.225.440.642.841.139.437.235.434.232.631.730.829.127.826.525.740.843.341.639.837.735.734.532.93231.229.428.126.8264143.74240.2383634.833.232.331.529.728.427.126.241.244.142.340.638.436.335.133.532.631.83028.727.326.541.444.542.740.938.736.635.433.832.93230.328.927.626.741.64543.241.439.236.935.734.233.332.430.629.227.92741.845.443.641.839.537.23634.533.632.730.929.528.127.2Rm00.511.522.533.544.555.564245.944.142.239.937.636.334.9343331.229.828.527.542.246.344.442.640.33836.635.234.333.331.530.128.727.842.446.744.84340.638.336.935.534.633.631.830.4292842.647.245.343.441.138.737.335.934.93432.130.729.328.342.847.645.743.841.43937.636.235.234.332.430.929.528.64348.146.244.241.839.43836.635.634.632.731.329.828.943.248.546.644.642.239.838.336.935.934.93331.530.129.143.4494745.142.640.238.737.236.335.333.331.830.429.443.649.447.445.44340.53937.536.635.633.632.130.629.643.849.947.945.943.440.939.437.936.935.933.932.430.929.94450.448.446.443.841.339.838.337.336.334.332.831.230.244.250.848.846.744.241.740.138.637.636.634.53331.530.544.451.349.247.244.642.140.5393836.934.933.331.830.844.651.749.647.64542.440.839.338.337.235.233.632.13144.852.250.14845.442.841.239.738.637.635.533.932.431.34552.750.648.545.843.241.640.13937.935.834.332.731.645.253.251.148.946.343.64240.439.438.336.234.63331.945.453.651.549.446.64442.340.739.738.636.434.833.232.245.654.151.949.847.144.442.741.1403936.835.233.532.545.854.652.450.247.544.843.141.540.439.337.135.533.932.8465552.850.647.945.243.541.940.839.737.535.834.233.146.255.553.351.148.345.543.842.241.14037.736.134.433.346.45653.851.548.745.944.242.641.440.338.136.434.733.646.656.554.25249.246.344.642.941.840.738.436.73533.946.85754.752.449.646.74543.342.24138.83735.334.24757.555.252.95047.245.243.742.641.439.137.435.634.547.25855.753.450.547.645.844.142.941.839.437.73634.847.458.556.253.850.94846.244.543.342.139.83836.335.147.65956.654.351.348.446.644.843.742.540.138.436.635.447.859.557.154.751.848.84745.24442.840.538.736.935.7486057.655.252.249.247.445.644.443.240.83937.23648.2—5855.752.649.647.84644.843.641.139.337.536.348.4—58.656.153.15048.246.445.143.941.539.637.836.648.6—5956.653.550.448.646.745.544.341.84038.136.948.8—59.557.15450.94947.145.944.642.240.338.437.249—6057.554.451.349.447.546.24542.540.638.837.549.2——5854.851.749.847.946.645.442.84139.137.849.4——58.555.352.150.248.347.145.843.241.339.438.2Rm00.511.522.533.544.555.5649.6——58.955.752.550.648.747.446.243.641.739.738.549.8——59.456.2535149.147.846.543.94240.138.850——59.956.753.451.449.548.246.944.342.340.439.150.2———57.153.851.949.948.547.244.642.640.739.450.4———57.654.352.350.34947.745434139.750.6———5854.752.750.749.44845.443.441.44050.8———58.555.153.151.149.848.445.743.741.740.351———5955.653.551.550.148.846.144.14240.751.2———59.4565451.950.549.246.444.442.34151.4———59.956.454.452.350.949.646.844.742.741.351.6————56.954.852.751.35047.245.14341.651.8————57.355.253.151.750.347.545.443.341.852————57.855.753.652.150.747.945.843.742.352.2————58.256.15452.551.148.346.24442.652.4————58.756.554.45351.548.746.544.44352.6————59.15754.853.451.94946.944.743.352.8————59.657.455.253.852.349.447.345.143.653————6057.855.654.252.749.847.645.443.953.2——