回彈法測(cè)混凝土強(qiáng)度

1、標(biāo)準(zhǔn)文案回彈法測(cè)混凝土強(qiáng)度適用范圍回彈法適用于一般建筑工程中普通混凝土抗壓檢測(cè)，檢測(cè) 結(jié)果可作為處理混凝土質(zhì)量問題的依據(jù)。不適用于表層與內(nèi)部 質(zhì)量明顯差異或內(nèi)部存在缺陷的混凝土結(jié)構(gòu)的檢測(cè) 抽樣方法及樣本大小規(guī)定1、相同的生產(chǎn)工藝條件下，混凝土強(qiáng)度等級(jí)相同，原材料、 配合比、成型工藝、養(yǎng)護(hù)條件和齡期相同的構(gòu)件，按批進(jìn) 行檢測(cè)，抽檢數(shù)量不得少于同批構(gòu)件總數(shù)的 30%且構(gòu)件數(shù) 量不得少于10個(gè)。抽檢構(gòu)件數(shù)量不得少于標(biāo)準(zhǔn)規(guī)定的最小 樣本容量。抽取構(gòu)件時(shí)，抽取具有一定代表性的構(gòu)件，有 關(guān)方面應(yīng)協(xié)商一致。冬脈那建筑結(jié)構(gòu)抽樣檢驗(yàn)的小樣本容量檢測(cè)批容 量檢測(cè)類別和拝本最小容量檢測(cè)批容量檢測(cè)類別和樣本最小容量A

2、BCABc28223801 120032801259-15235120132005012520016-253583201 100008020031526-50581310001 3500012531550051905132035001150000200500SOO9115082032150001 500000315aoo1250151 2801332505000050012502000281-500I 205080注：檢測(cè)類別A適用于一般施工質(zhì)量的檢測(cè)檢測(cè)類別B適用于結(jié)構(gòu)質(zhì)量或性能的 一般檢測(cè)，檢測(cè)類別C適用于結(jié)構(gòu)質(zhì)量或性能的嚴(yán)格檢測(cè)或復(fù)檢.無特別說明時(shí)，樣本單位為構(gòu)件，272、樣本測(cè)區(qū)要求，

3、每一個(gè)構(gòu)件測(cè)區(qū)數(shù)不少于10個(gè)；對(duì)某一方 向尺寸小于4.5m且另一方向尺寸小于0.3m的構(gòu)件，其測(cè) 區(qū)數(shù)量可適當(dāng)減少，但不應(yīng)少于 5個(gè)。3、相鄰兩測(cè)區(qū)應(yīng)控制在2m以內(nèi)，測(cè)區(qū)離構(gòu)件邊緣距離不宜大 于0.5m且不宜小于0.2m。4、測(cè)區(qū)面積不宜大于0.04 m2o5、測(cè)區(qū)應(yīng)盡量選在使回彈儀處于水平方向檢測(cè)混凝土的側(cè)面。當(dāng)不能滿足這一要求時(shí)，可使回彈儀處于非水平方向 檢測(cè)混凝土的澆筑側(cè)面、表面或底面。6、測(cè)區(qū)宜選在構(gòu)件的兩個(gè)對(duì)稱可測(cè)面上，也可選在一個(gè)可測(cè) 面上，且應(yīng)分布均勻。在構(gòu)件的重要部位及薄弱部位，必 須布置測(cè)區(qū)，并應(yīng)避開預(yù)埋件；7、檢測(cè)面應(yīng)為混凝土表面，并應(yīng)清潔、平整、不應(yīng)有疏松層、 浮漿、油垢

4、及蜂窩、麻面，必要時(shí)可用砂輪清楚疏松層和 雜物，且不應(yīng)有殘留的粉末或碎屑；8對(duì)彈擊時(shí)產(chǎn)生顫動(dòng)的薄壁或小構(gòu)件應(yīng)進(jìn)行固定。三、實(shí)驗(yàn)儀器檢定1、回彈儀在工程檢測(cè)前后進(jìn)行率定試驗(yàn)，在洛氏硬度HRC為60 2的鋼砧上，回彈儀的率定值為 80 2。2、回彈儀使用時(shí)環(huán)境溫度應(yīng)在-4+40 C之間。3、回彈儀累計(jì)彈擊次數(shù)超過2000次是應(yīng)常規(guī)保養(yǎng)，超過6000 次時(shí)應(yīng)送檢。四、回彈檢測(cè)1、測(cè)點(diǎn)布置，測(cè)點(diǎn)在測(cè)區(qū)范圍內(nèi)均勻分布，相鄰兩測(cè)點(diǎn)的凈距 一般不小于2cm測(cè)點(diǎn)距構(gòu)建邊緣或外露鋼筋和預(yù)埋件的距 離一般不小于3cm測(cè)點(diǎn)不應(yīng)在氣孔或外露石子上，2、檢測(cè)時(shí)回彈儀的軸線應(yīng)始終垂直于混凝土檢測(cè)面，緩慢施壓，準(zhǔn)確讀數(shù)，快

5、速復(fù)位。同一測(cè)點(diǎn)只允許彈擊 1次。3、每一測(cè)區(qū)應(yīng)取16個(gè)回彈值，讀書估讀至1。4、回彈值測(cè)量完畢后應(yīng)選擇不少于構(gòu)件的 30%測(cè)區(qū)數(shù)在有代 表性的位置測(cè)量碳化深度，取其平均值為該構(gòu)件每測(cè)區(qū)的碳 化深度值。當(dāng)碳化深度值極差大于2mn時(shí)，應(yīng)在每一測(cè)區(qū)測(cè) 量碳化深度值。五、碳化深度測(cè)量1、用合適的工具在測(cè)區(qū)表面形成直徑約 15mm勺孔洞，其深度 大于混凝土的碳化深度。2、除凈孔洞中的碎屑和粉末，不得用水沖洗。3、立即用濃度為1%的酚酞酒精溶液滴在孔洞內(nèi)壁的邊緣處。4、用深度測(cè)量工具測(cè)量碳化和未碳化的交界處到表面的垂直 距離3次，讀數(shù)精確到0.5mm取平均值為碳化深度值。六、回彈值計(jì)算1、從16個(gè)回彈值

6、中剔除3個(gè)最大值和3個(gè)最小值，余下10個(gè)回彈值取品均值，精確到0.1.若回彈儀非水平檢測(cè)時(shí)，應(yīng)按 R=Ra +Ra修正；Ra為檢測(cè)平均回彈值，Raa為修正值（JGJ/T23-2011附錄C）2、水平方向檢測(cè)混混凝土澆筑面或澆筑底面時(shí)應(yīng)按下修正：R=Rt m+ Rt a R=Rb m+ Rb aRt m為表面測(cè)區(qū)平均回彈值 Rb m為底面測(cè)區(qū)平均回彈值Rt m為表面測(cè)區(qū)平均修正值 Rb m為底面測(cè)區(qū)平均修正值（修正值JGJ/T23-2011附錄D）3、當(dāng)回彈儀非水平且非側(cè)面時(shí)應(yīng)先角度修正，再澆筑面修正七、確定測(cè)強(qiáng)曲線及測(cè)強(qiáng)曲線換算1、非泵送混凝土測(cè)強(qiáng)曲線，測(cè)區(qū)強(qiáng)度按附錄A換算；泵送混凝土測(cè)強(qiáng)曲線

7、，測(cè)區(qū)強(qiáng)度按附錄 B換算； 適用條件：混凝土采用的材料符合國家現(xiàn)行有關(guān)標(biāo)準(zhǔn)； 采用普通成型工藝；模板符合國家標(biāo)準(zhǔn)規(guī)定；蒸汽養(yǎng)護(hù) 出池經(jīng)自然養(yǎng)護(hù)7d以上，且混凝土表層為干燥狀態(tài)；自然養(yǎng)護(hù)且齡期為（141000）d;抗壓強(qiáng)度為（1060） MPa 測(cè)區(qū)混凝土強(qiáng)度換算表所依據(jù)的統(tǒng)一測(cè)強(qiáng)曲線，其強(qiáng)度 誤差值應(yīng)符合平均相對(duì)誤差不應(yīng)大于士 15%相對(duì)標(biāo)準(zhǔn)差 不應(yīng)大于18% 不適用統(tǒng)一測(cè)強(qiáng)曲線條件：混凝土非泵送粗骨料最大粒 徑大于60mm泵送粗骨料最大粒徑大于31.5mm特種成 型工藝制作；檢測(cè)部位曲率半徑小于250mm潮濕或浸水 混凝土。2、地區(qū)和專用測(cè)強(qiáng)曲線 地區(qū)測(cè)強(qiáng)曲線平均相對(duì)誤差不應(yīng)大于士 14%相

8、對(duì)標(biāo)準(zhǔn)差 不應(yīng)大于17% 專用測(cè)強(qiáng)曲線平均相對(duì)誤差不應(yīng)大于士 12%相對(duì)標(biāo)準(zhǔn)差 不應(yīng)大于14%八、混凝土強(qiáng)度計(jì)算1、構(gòu)件的測(cè)區(qū)混凝土強(qiáng)度換算值，根據(jù)求得的平均回彈值及平 均碳化深度值由附錄A、B查表或計(jì)算得出；當(dāng)有地區(qū)或?qū)?用測(cè)強(qiáng)曲線時(shí)，混凝土強(qiáng)度的換算值宜按地區(qū)強(qiáng)度曲線或?qū)?用測(cè)強(qiáng)曲線計(jì)算或查表得出。2、構(gòu)件的測(cè)區(qū)混凝土強(qiáng)度平均值應(yīng)根據(jù)各測(cè)區(qū)的混凝土強(qiáng)度 換算值計(jì)算。3、當(dāng)測(cè)區(qū)數(shù)為10個(gè)及以上時(shí)，還應(yīng)計(jì)算強(qiáng)度標(biāo)準(zhǔn)差。4、構(gòu)件的現(xiàn)齡期混凝土強(qiáng)度推定值A(chǔ)、當(dāng)構(gòu)件測(cè)區(qū)數(shù)小于10個(gè)時(shí)，構(gòu)件的先齡期混凝土強(qiáng)度推 定值等于構(gòu)件中最小的測(cè)區(qū)混凝土強(qiáng)度換算值。B、當(dāng)構(gòu)件測(cè)區(qū)強(qiáng)度值中出現(xiàn)小于10MPa時(shí)，構(gòu)件

9、的先齡期 混凝土強(qiáng)度推定值小于10MPaC當(dāng)構(gòu)件測(cè)區(qū)數(shù)不少于10個(gè)時(shí)，構(gòu)件的先齡期混凝土強(qiáng)度推定值為構(gòu)件測(cè)區(qū)混凝土換算的平均值減去 1.645倍標(biāo) 準(zhǔn)差的。測(cè)區(qū)混凝土強(qiáng)度換算表平均*平均就化i苯度吃dm 19.619.018.217.416.816.315.615314.71413-713.02X020319,7心1841Z61Z0I&515,815419IZ4|6,X16415,414,7、心23.622.922.22.220319.618.918.217.617.0P 16.615.614.930.423.Q23.222.521.520.619.819 11.417.S17.216K15.

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13、026.825.624.623.723022.121520.419 518334.230.329.42.327.025 .S24.823.923.22232i.s20619.71蠱454,430729,82S.627J26 025,024,12V42232L720.819 Si18.654,631J302如927A26.225,2M32V622,72k92L010,0l&R31.430 529.227.626.42SA24.5P23.S22.922.1p2120219.0平均 H蟬 值Rin測(cè)區(qū)混凝上強(qiáng)麼換算值f MPa平均曦化深度值曲n (nun)00.51.0L52.02.53.03.54

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16、7.235.54.833.43L630229 12H.026.926225.123.722.62 .-37.436315 2I、3L910529.428.327.226_525.424.022.921.837.636.735.634.132.330.29.72S.627.526.825.724 23.122.037用37.136.C34.532.6SI.230.028.927.827.126.024323A22.338.037.536434.933.031.530.329 228427.426.224.fi23.622.538.237.956.E站二33.431 830 629.51、二27.

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31、-S5T2 玖055.552 951.257.458.455.9533 J51.657.658.956353.75L9續(xù)興平肉Rm測(cè)區(qū)混耘土聶度換燈值尢.訐幾0平均碳化澤更恆dm(mm)005L0L52.02,5良0334.0455,05S657.8S9356.754.052.358.059.757.054.452.758.257.454.8S3.058.457,S55.25X458.65855.653.858.8辭55.954J59.059.056.354.S59.559456.75459.459.857.15S.259.957.555.657.956*060.05S.3$6.4泵送混凝土測(cè)區(qū)混凝土強(qiáng)度換算值的修正值(mm )抗 壓 強(qiáng) 墮(MPa)O h 0 5! 1.0f (MPa)W4Q045.0S0T055TU60.0K (MPa) +4.5+3.0+ L50.01.5? 2.0/J呵W30.035.040.060.0K (MPa)+工0+ 1300注：盼桶人的兀即用內(nèi)耐和旳址條構(gòu)砒0.L叭.非水平狀態(tài)檢測(cè)時(shí)的回彈值修正值Rma檢測(cè)增度向上向F30-45-6090206.