回弹仪计算

回弹仪计算
回弹仪计算

回弹仪计算
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修改五 回弹仪测定混凝土强度计算《规程JGJ/T23-2001》
根据2001年颁布的《回弹法检测混凝土抗压强度技术规程》JGJ/T23-2001（J115-2001）代替1992年颁布的《回弹法检测混凝土抗压强度技术规程》JGJ/T23-92,有如下主要修改.
P119页“统一换算表”内容有部分改动（下表中的灰色部分）
回弹均测区混凝土平均抗压强度换算值f（Mpa）
平均碳化深度值d平均（mm）
值00.51.01.52.02.53.03.54.04.55.05.5≥6
2010.310.1…
2111.411.210.810.510.0
2212.512.211.911.511.010.610.2…
2313.713.413.012.612.111.611.210.810.510.1
2414.914.614.213.713.112.712.211.811.511.010.710.410.1
2516.215.915.414.914.313.813.312.812.512.011.711.310.9
2617.517.216.616.115.414.914.413.813.513.012.612.211.6
2718.918.518.017.416.616.115.514.814.614.013.613.112.4
2820.319.719.218.417.617.016.515.815.414.814.413.913.2
2921.821.120.519.618.718.117.516.816.415.815.414.613.9
3023.322.621.921.020.019.318.617.917.416.816.415.414.7
3124.924.223.422.421.420.719.919.218.417.917.416.415.5
3226.525.724.923.922.822.021.220.419.619.118.417.516.4
3328.227.426.525.424.323.422.621.720.920.319.418.517.4
3430.029.128.026.825.624.623.723.022.121.320.419.518.3
3531.830.829.628.026.725.824.824.023.222.321.420.419.2
3633.632.631.229.628.227.226.225.224.523.522.421.420.2
3735.534.433.031.229.828.827.726.625.924.823.422.421.3
3837.536.434.933.031.530.329.228.127.426.224.823.622.5
3939.538.236.734.733.031.830.629.628.827.426.024.823.7
4041.639.938.336.234.533.331.730.830.028.427.025.825.0
4143.742.040.238.036.034.833.232.331.529.728.427.126.2
4245.944.142.239.937.636.334.934.033.031.229.828.527.5
4348.146.244.241.839.438.036.635.634.632.731.329.828.9
4450．448.446.443.841.339.838.337.336.334.332.831.230.2
4552．750．648.545.843.241.640.139.037.935.834.332.731.6
4655．052．850．647.945.243.541.940.839.737.535.834.233.1
4757．555．252．950．047.245.243.742.641.439.137.435.634.5
4860．057．655．252．249．247.445.644.443.240.839.037.236.0
4960．057．554．451．349．447.546.245.042.540.638.837.5
5059．956．753．451．449．548.246.944.342.340.439.1
P120页9-16行“构件混凝土强度推定值f推定”中的推定值计算方法有所改动：
4．构件混凝土强度推定值f推定
构件混凝土强度推定值是指相应于强度换算值总体分布中保证率不低于95％的强度值.
（l）当测区少于10个时,以测区混凝土强度的最小值作为该构件的混凝土强度推定值,即：
f推定= fi-min
（2）当测区强度值出现小于少于10.0 MPa时：
f推定=10.0 MPa
（3）当测区不少于10个或按批量检测时,该构件的混凝土强度推定值为：
f推定-1= f平均－1.645 S标准差
以上各式中：
f推定——混凝土强度推定值,MPa；
fi-min——该批构件中测区混凝土强度换算值的最小者,精确至0.1,MPa；
f平均——构件混凝土强度平均值,精确至0.1,MPa；
S标准差——构件混凝土强度标准差,精确至0.0l,MPa.
参考资料：《回弹法检测混凝土抗压强度技术规程》JGJ/T23-2001（J115-2001）