回彈法檢測混凝土強度實驗報告

1、回彈法檢測檢測混凝土強度試驗報告1、實驗目的：、掌握回彈法測強曲線的建立方法；、掌握回彈儀工作原理、并能熟練操作。2、儀器型號：ZC3-A。編號:20000413573、實驗條件、地點：4、回歸曲線試件試配強度：C20C25C30C40C45C505、實驗方法：用。每個測面上布置8個測點，若一個測區(qū)只有一個測面應選16個測點，測點應均勻分布，測點之間距離不少于30mm。1、2、3、4、5、6，試件保持處在3050KN的壓力下實驗，將回彈儀垂直針向后移動直至到達一定位置時，即讀出回彈值（1）。去除三個最大值、三個最小值，記錄數(shù)據(jù)。二一 試驗記錄表一： 本組數(shù)據(jù)結果記錄（C50）回彈值回彈值試件一

2、試件二試件三試件四試件五試件六編號R1454648464948R2504947494847R3435051484350- - PAGE 5 -RR4484653515053R5494946485146R6534848474749R7485043495048R8464344535146R9434648554850R10495349424651R11485047464949R12514352494653R13504850514943R14484943485047R15484749474649R16494950464948平均值48.348.148.448.248.548.7（cm）51.553.3

3、54.157.957.254.9測試角度測面狀態(tài)側面干燥無灰水平日期2010-5-8濕度：49%溫度：24C地點：土建實驗室回彈值抗 壓 強 度回彈值抗 壓 強 度序號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曲線，各參數(shù)如圖所示。圖一：強度-回彈回歸曲線70f度 60y = 1.6776x - 24.8232強壓50403020100R01020304050回彈值R（Cm）= 0.847回歸線m ni11000，fcuffcufcu,i111n fcu,i1100 02i1 fc0cu,i00000000000帶入數(shù)據(jù)分別計算得; m 0000,Sr 11.9，均滿足專用曲線建立標準。且R2= 0.847，符合度良好。3、去除多余數(shù)據(jù)點，圖中去除了點32.337.9（35.826.1（38

8、.432.4R2 0.752R2 0.847，顯然增加了可靠性和精確度。456.2MPa、55.9MPa、56.4MPa、56.0MPa、56.5MPa、56.9MPa。5、試件強度推定,由式:i1f ccu2 n mni1f ccu2 n mn12f ccuncuS可知本組構件平均強度mfcf ccuMPa,Sf c=1.36MPa5.5MPa,滿足條件。而根據(jù)式：cucufcu,e mf c1.645S.f ccucu將數(shù)據(jù)帶入可解得，本組實驗評定值為:54.0MPa50MPa ，可以發(fā)現(xiàn)與試配強度50MPa50 55.450 55.450，效果良好。000000000=3.10, =2.800102、 3.23、 4.20 、 3.60040500、=1.10 ,誤差較小.006000表三：回彈法數(shù)據(jù)結果歸納56.255.956.456.056.556.9（MPa）強度計算值m=56.3MPaS=1.36MPa56.0