回弹法检测混凝土强度实验报告

1、回弹法检测检测混凝土强度试验报告1、实验目的：、掌握回弹法测强曲线的建立方法；、掌握回弹仪工作原理、并能熟练操作。2、仪器型号：ZC3-A。编号:20000413573、实验条件、地点：4、回归曲线试件试配强度：C20C25C30C40C45C505、实验方法：用。每个测面上布置8个测点，若一个测区只有一个测面应选16个测点，测点应均匀分布，测点之间距离不少于30mm。1、2、3、4、5、6，试件保持处在3050KN的压力下实验，将回弹仪垂直针向后移动直至到达一定位置时，即读出回弹值（1）。去除三个最大值、三个最小值，记录数据。二一 试验记录表一： 本组数据结果记录（C50）回弹值回弹值试件一

2、试件二试件三试件四试件五试件六编号R1454648464948R2504947494847R3435051484350- - PAGE 5 -RR4484653515053R5494946485146R6534848474749R7485043495048R8464344535146R9434648554850R10495349424651R11485047464949R12514352494653R13504850514943R14484943485047R15484749474649R16494950464948平均值48.348.148.448.248.548.7（cm）51.553.3

3、54.157.957.254.9测试角度测面状态侧面干燥无灰水平日期2010-5-8湿度：49%温度：24C地点：土建实验室回弹值抗 压 强 度回弹值抗 压 强 度序号R f (Cm.i i（R /cm）i（f /MPa）iR2（Cm2）if 2（MPa2）iMPa)2013326.91089723.61887.7232.337.91043.29750.76885.02331.926.41017.61696.96842.16432.926.81082.41718.24881.72532.827.51075.84756.25902631.926.11017.61681.21832.59735.8

4、26.11281.641043.291156.34834.931.21218.01973.441088.88936.728.91346.89835.211060.63251036.127.91303.21778.411007.191135.931.41288.81985.961127.261234.632.41197.161049.761121.041338.432.41474.561436.411455.361436.936.51361.611332.251346.851537.135.91376.411288.811331.891634.937.81218.011428.841319.22

5、301737.538.11406.251451.611428.751837.536.91406.251361.611383.751938.043.614441897.0861655.1112036.642.21339.61782.7161545.3332138.139.11451.61529.6791490.133402237.342.21391.31782.7161574.8892338.744.41497.71971.361718.282438.245.31459.22052.091730.462538.839.11505.41528.811517.082639.448.01552.423

6、041891.22739.640.01568.2160015842838.544.91482.32016.011728.65452938.444.41474.61971.36704.963039.239.11536.61528.811532.723148.351.52332.892652.252487.453248.153.32313.612840.892046.723348.454.12342.562930.4182078.72503448.257.92323.243348.5512789.1733548.557.22352.253271.842774.23648.754.92368.444

7、30122671.259.71382.11409.553943.6158314.7355639.02 Rfif曲线，各参数如图所示。图一：强度-回弹回归曲线70f度 60y = 1.6776x - 24.8232强压50403020100R01020304050回弹值R（Cm）= 0.847回归线m ni11000，fcuffcufcu,i111n fcu,i1100 02i1 fc0cu,i00000000000带入数据分别计算得; m 0000,Sr 11.9，均满足专用曲线建立标准。且R2= 0.847，符合度良好。3、去除多余数据点，图中去除了点32.337.9（35.826.1（38

8、.432.4R2 0.752R2 0.847，显然增加了可靠性和精确度。456.2MPa、55.9MPa、56.4MPa、56.0MPa、56.5MPa、56.9MPa。5、试件强度推定,由式:i1f ccu2 n mni1f ccu2 n mn12f ccuncuS可知本组构件平均强度mfcf ccuMPa,Sf c=1.36MPa5.5MPa,满足条件。而根据式：cucufcu,e mf c1.645S.f ccucu将数据带入可解得，本组实验评定值为:54.0MPa50MPa ，可以发现与试配强度50MPa50 55.450 55.450，效果良好。000000000=3.10, =2.800102、 3.23、 4.20 、 3.60040500、=1.10 ,误差较小.006000表三：回弹法数据结果归纳56.255.956.456.056.556.9（MPa）强度计算值m=56.3MPaS=1.36MPa56.0