混凝土強度等級檢測回彈試驗附砼強度換算值

1、混凝土強度等級檢測（回彈試驗）回彈法檢測砼強度試用于工程結構普通砼抗壓強度的檢測。 砼強度值的確定分為如下幾個步驟：1、回彈值測量2、碳化深度值測量3、回彈值計算4、砼強度的計算一、回彈值測量1、一般規(guī)定：結構或物件砼強度檢測可采用下列兩種方式，其適用范圍及結構或構件數(shù)量應符合下列規(guī)定：（ 1）、單個檢測：適用于單個結構或構件的檢測。（ 2）、批量檢測：適用于相同的生產工藝條件下，砼強度等級相同，原材料、配合比、成型工藝、養(yǎng)護條件基本一致且齡期相近的同類結構或構件，按批進行檢測的結構構件。抽檢數(shù)量不得少于同批構件總數(shù)的30%且不得少于 10 件。2、每一結構或構件的測區(qū)應符合下列規(guī)定：（ 1）

2、、每一結構或構件測區(qū)數(shù)量應不少于10 個。對某一方向尺寸小于 4.5米，且另一方向尺寸小于 0.3 米的構件其測區(qū)數(shù)量可適當減少，但不應少于5 個。（ 2）、相鄰兩測區(qū)的間距應控制在2 米以內。測區(qū)離構件端部或施工縫邊緣的距離不宜大于0.5 米，且不宜小于 0.2 米。（ 3）、測區(qū)應選在使回彈儀處于水平方向檢測砼澆筑側面，當不能滿足這一要求時，可使回彈儀處于非水平方向檢測砼強度澆筑側面、表面或底面。但回彈值需修正。（ 4）、測區(qū)宜選在構件的兩個對稱可測面上，也可選在一個可測面上，且應均勻分布。 在構件的重要部位及薄弱部位必須布置測區(qū)， 并應避開預埋件。（5）、測區(qū)的面積不宜大于0.04 m2

3、o（ 6）、檢測面應為砼表面，并應清潔平整，不應有疏松層、浮漿、油垢、涂層以及蜂窩、麻面。必要時可用砂輪清除疏松層和雜物，且不應有殘留的粉末或碎屑。3、回彈值測定（ 1）、檢測時，回彈儀的軸線應始終垂直于結構或構件的檢測面。緩慢施壓，準確讀數(shù)，快速復位。（ 2）、測點宜在測區(qū)范圍內均勻分布。相鄰兩測點的凈距不宜小于20mm。測點距外露鋼筋、 預埋件的距離不宜小于30mm。 測點不應在氣孔或外露石子上，同一測點只應彈一次，每一測區(qū)應取16 個回彈值。二、碳化深度測量值回彈值測量完畢后，應在有代表性的位置上測量碳化深度值。測點不應小于構件測區(qū)數(shù)的30%， 取其平均值為該構件的每測區(qū)的碳化深度值，當

4、碳化深度最大值與最小值之差大于2.0mm時，應在每一測區(qū)測量碳化深度。碳化深度值測量，可采用適當?shù)墓ぞ咴跍y區(qū)表面形成直徑約15mm?L洞，其深度應大于砼的碳化深度?？锥粗械姆勰┖退樾紤宄蓛簦⒉坏糜盟料?。 同時， 應采用濃度為1%的酚酞酒精溶液滴在孔洞內壁的邊緣處。當已碳化與未碳化界線清楚時再用深度測量工具測量已碳化與未碳化硅交界面到硅表面的垂直距離。 測量應不少于3次，取其平均值每次讀數(shù)精確至0.5mm1、計算測區(qū)平均回彈值，應該從該測區(qū)的16個回彈值中剔除3個最大值和3個最小值，求余下的10個回彈值的平均值，如果是水平方向回彈澆筑硅的 側面，該值即為該測區(qū)平均回彈值 Rm如果不足，此

5、值還需修正。非水平方向檢測硅澆筑側面時，應按下列修正： Rm=R m+Ra式中Rm% :非水平狀態(tài)檢測時測區(qū)的平均回彈值，精確到 0.1Ra%:非水平狀態(tài)檢測時回彈值修正值，可按本附表 1采用。Rm測區(qū)平均 回彈值（修正后）非水平狀態(tài)檢測時回彈值修正值表1檢測角度+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水平方向檢測硅澆

6、筑頂面或底面時,應按下列修正：Rm=m+R；Rm= Rm+R式中：Rm測區(qū)修正后平士回彈值以：水平方向檢測硅澆筑表面時，測區(qū)平均回彈值。R：:硅澆筑表面回彈值的修正值，見附表 2。Rm：水平方向檢測硅澆注底面時，測區(qū)平均回彈值。Rb :硅澆筑底面回彈值的修正值。見附表 2當檢測時回彈儀為非水平方向且測試面為非硅的澆筑側面時。應先按附表1對回彈值進行角度修正。再按附表2對修正后的值進行澆筑面修正。即: 先修正角度，再修正澆筑面。不同澆筑面的回彈值修表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、硅強度的計算(平均強度)1、經(jīng)過以上硅回彈數(shù)值測量。回彈數(shù)值修正。碳化深度測量后，可利用平均回彈修正數(shù)值(Rm及平均碳化深度(dm)，查附表3,可求得各個測區(qū)硅強度換算值2根據(jù)各個測區(qū)的硅強度換算值可計算測區(qū)硅強度平均值。當測區(qū)數(shù)為10個及以上時，應計算強度標準差，平均值及標準差應按下式計算:mfcfcunfc1 cu ii 1nsfc f fcun(fcUi)2 n(mji 1式中:mfc ：結構或構件測區(qū)硅強度換算值的平均值。 ,cun：對于單個檢測的構件，取一個構件的測區(qū)數(shù)；對批量檢測的構件，取被 抽檢構件的

8、測區(qū)之和cfcui ：測區(qū)硅強度換算值。s篇：結構或構件測區(qū)硅強度換算值的標準差3、 結構或構件硅強度推定值（fcu,e ）的計算：結構或構件的硅強度推定值即是硅強度值，是指相應于強度換算值總體分布中保證率不低于95%勺結構或構件中的硅抗壓強度值。即：查表或據(jù)測強度曲線得出的強度換算值中有95%勺值小于硅強度指定值。（1）、當該結構或構件測區(qū)數(shù)少于10個時，強度推定值取強度換算值中最小的 1 個。即 fcu,e =min（ f。）、當該結構或構件的測區(qū)強度值中出現(xiàn)小于10.0Mpa這個數(shù)值時，硅強度值指定值則取小于10.0Mpa。即fcu ,e 10.0Mpa這個數(shù)值一般不出現(xiàn)。在測強度曲線和

9、換算值表中也查不到，所以當出現(xiàn)硅強度換算值10.0Mpa時。硅強度推定值不用計算，直接取10.0Mpa。(3)、當該結構或構件測區(qū)數(shù)不少于10個或按批量檢測時，硅強度推定值：硅強度換算值表3平均回彈平均碳化深度值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