DBJ∕T 15-211-2021 回弹法检测泵送混凝土抗压强度技术规程.pdf

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  • 3.2.3回弹仪的率定应符合下列规定: 1钢砧表面应干燥、清洁,并应稳固地平放在 刚度大的水平面上; 2回弹仪的弹击杆通过钢砧的导向套筒简,使其 端部球面与砧芯接触,回弹仪应垂直于接触面连续 向下弹击3次; 3弹击杆旋转3次,每次应旋转90°,且每旋 转1次弹击杆,应弹击3次; 4率定应分四个方向进行,每个方向应取连续 3次稳定回弹值的平均值作为率定值: 5回弹仪四个方向的率定值均满足本规程第 3.1.3条给出的限值,则率定结果合格。 3.2.4回弹仪率定所用的钢砧应符合现行国家标准

    《回弹仪》GB/T9138的规定,应每2年送计量检 定机构检定或校准。

    3.3.1 当回弹仪存在下列情况之一时,应进行保养:

    1 回弹仪弹击超过2000次; 2 率定结果不合格; 3 对检测值有怀疑。 3.3.2 回弹仪的保养应由通过专业培训的人员按下 列步骤进行: 1先将弹击锤脱钩,取出机芯,然后卸下弹击 杆,取出里面的缓冲压簧,并取出弹击锤、弹击拉 簧和拉簧座等; 2擦清洁机芯各零部件,并应重点清理中心 导杆、弹击杆的端面、弹击锤的内孔和冲击面; 3保养完成并组装仪器后应按本规程第3.2.3 条的规定进行率定; 4对于数字式回弹仪混凝土标准规范范本,还应按产品要求的维护 程序进行维护。 3.3.3回弹仪的保养应符合下列规定: 1经过清理的零部件,除应在中心导杆上薄薄 涂抹钟表油外,其他零部件均不得抹油; 2应保持弹击拉簧前端钩入拉簧座的原孔位;;

    1经过清理的零部件,除应在中心导杆上薄薄 徐抹钟表油外,其他零部件均不得抹油; 2应保持弹击拉簧前端钩入拉簧座的原孔位:

    3不得旋转尾盖上已定位紧固的调零螺丝: 4不得自制或更换零部件。

    3不得旋转尾盖上已定位紧固的调零螺丝; 不得自制或更换零部件。 3.3.4回弹仪每次使用完毕后,应使弹击杆伸出机 壳,清除弹击杆、杆前端球面以及刻度尺表面和外 壳上的污垢、尘土。

    3.3.4回弹仪每次使用完毕后,应使弹击杆伸出机

    壳,清除弹击杆、杆前端球面以及刻度尺表面和外 壳上的污垢、尘土。

    3.3.5回弹仪不用时,应将弹击杆压入机壳内,经

    弹击后按下按钮,锁住机芯,然后装入仪器箱,并 应平放在干燥阴凉、无腐蚀性气体的室内。当数字 式回弹仪长期不用时,应取出电池。

    4.1.1使用回弹仪进行工程检测的人员,应经专业 培训合格。

    4.1.2检测前宜收集下列资

    1工程名称及建设、设计、施工、监理单位名 称; 2构件名称、数量、部位及混凝土制备工艺、 强度等级; 3水泥品种、强度等级、安定性,砂石品种、 粒径,外加剂、掺合料品种类别,混凝土配合比等 4施工模板类型,混凝土浇筑日期、施工工艺, 养护情况等; 5必要的设计图纸和施工记录; 6 检测原因。

    4.1.3采用回弹法检测混凝土强度,可按单个术

    进行检测,也可按批抽样进行检测

    4.1.4按单个构件检测时,应符合下列规定:

    4.1.4按单个构件检测时,应符合下列规定:

    1对于一般构件,测区数不宜少于10 个; 2受检构件某一方向尺寸不大于4.5m且另 方向尺寸不大于0.3m时,测区数量可适当减少,但 不应少于5个。

    4.1.5构件的测区布置应符合下列规定:

    1测区应布直在混凝士浇筑测面; 2测区宜布置在构件的两个对称的可测面上, 当不能布置在对称的可测面上时,也可布置在同 个可测面上; 3在构件的重要部位及薄弱部位应布置测区, 并应避开预埋件; 4测区应均匀分布,相邻两测区的间距不应大 于2m,测区离构件端部或施工缝边缘的距离不宜大 于0.5m,且不宜小于0.2m; 5测区尺寸宜为200mm×200mm; 6测区表面应为混凝土原浆面,并应清洁、平

    整、干燥,不应有接缝、疏松层、浮浆、油垢、饰 面层、涂层以及蜂窝、麻面;表面不平处可用砂轮 适度打磨,并擦净残留粉尘; 7测区应标有清晰的编号,并宜在记录纸上绘 制测区布置示意图和描述外观质量情况, 4.1.6按批抽样检测时,同时符合下列条件的构件 可作为同批构件: 1混凝土设计强度等级、配合比和成型工艺相 同; 2 原材料、养护条件基本一致且龄期相近: 3 构件种类相同; 4 在施工阶段所处状态相同。 4.1.7 对同批构件按批抽样检测时,应符合下列规 定: 1 构件应随机抽样; 2抽样数量不宜少于同批构件总数的30%且不 宜少于10个构件; 3当同批构件数量大于 50个时,抽样数量可按

    现行国家标准《建筑结构检测技术标准》GB/T50344 的规定进行调整,但抽检的构件总数不宜少于10 个,并应按现行国家标准《建筑结构检测技术标准》 GB/T50344的规定进行同批构件混凝土的强度推 定; 4当同批构件数量大于50个且不需提供单个 构件推定强度时,抽检的每个构件的测区数量可适 当减少,但不应少于5个。

    现行国家标准《建筑结构检测技术标准》GB/T50344 的规定进行调整,但抽检的构件总数不宜少于10 个,并应按现行国家标准《建筑结构检测技术标准》 GB/T50344的规定进行同批构件混凝土的强度推 定; 4当同批构件数量大于50个且不需提供单个 构件推定强度时,抽检的每个构件的测区数量可适 当减少,但不应少于5个。 4.1.8当被检测混凝土的原材料和龄期与制定本规 程测强曲线所采用的原材料和龄期有较大差异时, 对同批构件混凝,应采用同条件养护立方体试件 或直接从结构构件测区内钻取混凝土芯样试件的抗 压强度值,对测区混凝土强度换算值进行修正,立 方体试件或芯样应符合下列规定: 1采用同条件养护立方体试件修正时,试件数 量不应少于6个,试件边长应为150mm; 2采用混凝土芯样试件修止时,芯样数量应符 合现行行业标准《钻芯法检测混凝土强度技术规程》

    GJ/T384的规定:直径100mm芯样试件的数量个 应少于6个,直径不小于70mm的小直径芯样试件 的数量不应少于9个。钻芯位置应在回弹测区内, 个测区应只取1个有效芯样,且只加工为1个芯 样试件。

    4.2.1 回弹仪测量回弹值时,应符合下列规定: 1 回弹仪的轴线应始终垂直于混凝土检测面; 2 应缓慢施压、准确读数、快速复位: 3同一测点应只弹击一次,每一测点的回弹值 读数应精确至1; 4对于弹击时产生颤动的薄壁、小型构件,应 进行固定。 4.2.2每一测区应记取16个回弹测点,测点在测区 范围内宜均习分布,不得分布在气孔或外露石子上 相邻两测点的净距离不宜小于20mm;测点距外露 钢筋、预埋件、铁件等的距离不宜小于30mm。

    4.2.2每一测区应记取16个回弹测点,测点在

    4.2.2每一测区应记取16个回弹测点,测点在测区

    4.2.3计算测区回弹值时,在同一测区的16个回弹 值中,应先剔除3个最大值和3个最小值,然后将 余下的10个回弹值按下式计算,其结果作为该测区 回弹值的代表值:

    式中: R 一 测区回弹代表值,精确至0.1; R,一一第i个测点的回弹值。 4.2.4非水平方向检测混凝土浇筑侧面时,测区回 弹值的代表值应按下式修止:

    式中: Rα 非水平方向检测时测区回弹代表 值,精确至0.1; Ra——非水平方向检测时回弹值修正值,应 按本规程附录C取值。

    4.3.1回弹值测量完毕后,应在有代表性的测区上 测量碳化深度值,抽检测区数不应少于构件测区数 的30%,且不宜少于3个,应取其平均值作为该构 件个测区的碳化深度值。当碳化深度值极差大于 2.0mm时,应在该构件每一测区分别测量碳化深度 值。

    1可采用工具在测区表面形成直径约15mm的 孔洞,其深度应大于混凝土的碳化深度; 2 应清除孔洞中的粉末和碎屑,且不得用水擦 洗; 3应采用浓度为1%~2%的酚酞酒精溶液滴在 孔洞内壁的边缘处,当已碳化与未碳化界线清晰时, 应采用碳化深度测量仪测量已碳化与未碳化混凝干 交界面到混凝土表面的垂直距离,并应测量3次, 每次读数应精确至0.25mm; 4应取三次测量的平均值作为该测区的碳化深

    值m,并应精确到0.5mm。

    5.0.1本规程给出的泵送混凝土测强曲线为地区测 强曲线,按附录A的方法制定。使用地区测强曲线 时,被检测的混凝土应与制定该测强曲线混凝土的 适用条件相同,不得超出该测强曲线的适用范围。 5.0.2测区混凝土强度换算值按本规程附录B进行 换算时,混凝土应符合下列条件: 1水泥应符合现行国家标准《通用硅酸盐水泥》 GB 175 的规定; 2砂、石应符合现行行业标准《普通混凝土用 砂、石质量标准及检验方法》JGJ52的规定; 3混凝土采用的外加剂、掺合料、拌合用水等 符合国家现行有关标准; 4混凝土施工时采用的模板符合现行国家标准 规定; 5自然养护且龄期为(14~1000)d。

    6.0.1按单个构件或按批抽样检测混凝土强度,第i 个测区混凝土强度换算值,由本规程附录B查表得 出。附录B表中数值是根据下列地区测强曲线公式 计算:

    式中:fou,i 第i测区混凝土强度换算值(MPa), 精确到0.1MPa; R一 测区回弹代表值,精确至0.1; dm 测区平均碳化深度值(mm),精确至0.5mm。 6.0.2 当出现本规程第4.1.8条情况时,计算修正量 及测区混凝土强度换算值的修止应符合下列规定: 1修正量应按下列公式计算:

    式中:△tot 测区混凝土强度换算值修止量 (MPa),精确到 0.1MPa; 第i个混凝土芯样试件的抗压强度, 青确到0.1MPa; 第i个同条件养护立方体试件的抗 压强度,精确到0.1MPa; 护立方体试件的测区混凝土强度换算值,精确到 0.1MPa; n一一芯样试件数或立方体试件数。 2测区混凝强度换算值的修止应按下式计 草:

    式中:fcu,i0 第测区修止前的混凝土强度换算值 (MPa),精确到 0.1MPa; fcα,il一—第i测区修正后的混凝土强度换算 值(MPa),精确到0.1MPa。 6.0.3测区混凝土强度换算值的平均值和标准差应 根据各测区混凝土强度换算值或修正后的测区混凝 土强度换算值进行计算。当测区数为10个及以上

    时,测混凝土强度换算值的平均值和标准差应按 下列公式计算:

    测区混凝土强度换算值的平均值 (MPa),精确至 0.1 MPa; Sf 测区混凝土强度换算值的标准差 (MPa),精确至 0.01 MPa; 测区数。当按单个构件检测时,取 该构件的测区数;当按批抽样检测时,取该同批构 件的测区数总和。 6.0.4按单个构件检测时,构件的现龄期混凝土强 度推定值(fou。)应按下列公式确定: 1测区数少于10个时,或者测区混凝土强度换 算值中出现≥60.0MPa时,该构件的混凝土强度推

    Jcu.e =Jcu.min

    式中: fcu,min 构件的测区混凝土强度换算值的 最小值(MPa),精确至0.1MPa。 2测区混凝土强度换算值全部大于或等于 50.0MPa时,该构件的混凝土强度推定值应按下式 确定:

    foue≥60.0MPa

    3测区混凝土强度换算值中出现<15.0MPa 时,该构件的混凝土强度推定值应按下式确定:

    fcue<15.0MPa

    4测区数不少于10个时,该构件的混凝王强度 推定值应按下式计算:

    6.0.5按批抽样检测时,同批构件的现龄期混凝士 强度推定值(fou。)应按下式计算:

    6.0.6按批抽样进行检测时,当该批构件测区混凝 土强度换算值的标准差出现下列情况之一,该批构 件应全部按单个构件进行检测: 1该批构件的测区混凝土强度换算值的平均值 (mra)小于25.0MPa 时,标准差(Sr)大于 4.50MPa; 2该批构件的测区混凝土强度换算值的平均值 准差(Src)大于5.50MPa; 3由于测区混凝土强度换算值中出现≥ 60.0MPa或者<15.0MPa,测区混凝土强度换算值不 能计算标准差。 6.0.7回弹法检测泵送混凝土抗压强度报告及其原 始记录可按本规程附录C的格式编写。

    A.0.1为编制广东地区泵送混凝土测强曲线,选取 省内有代表性地区的预拌商品混凝土开展试验工 作。 A.0.2选择本地区工程常用的水泥、粗骨料、细骨 料等原材料,制作强度等级为C15~C60、边长为 150mm的混凝土立方体标准试件。 A.0.3试件的制作、养护: 1采用符合现行行业标准《混凝土试模》JG237 规定的试模,各强度等级均采用同一盘混凝土均今 装模振揭成型; 2每个地区各强度等级的混凝土制作24组试 件(三个为一组); 3试件拆模后按“品”字形堆放并自然养护。 A.0.4试件的测试步骤: 1每个强度等级的试件按照测试龄期14d、28d、 60d、90d、180d、365d、720d、1000d各3组分别 开展测试工作; 2擦净被测试件,以浇筑侧面的两个相对面置 千压力机的上下承压板之间,加压60kN~100kN以 固定试件,低强度试件取低值; 3在试件保持压力下,采用符合本规程第3.1 节规定的回弹仪,按照本规程第4.2.1条规定的操作 方法,在试件两个相对浇筑侧面上进行回弹测试:

    A.0.3试件的制作、养护

    参照本规程第4.3.2条规定的操作方法,在试件的回 弹测试面上进行碳化深度测试: 4从每个试件16个回弹值中剔除3个最大值和 3个最小值,以余下的10个回弹值的平均值作为该 试件的回弹代表值R,精确至0.1:该试件的碳化深 度值αm,精确至0.5mm。 5按现行国家标准《混凝土物理力学性能试验 方法标准》GB/T50081的规定进行抗压强度测试, 将试件加荷至破坏,计算试件的抗压强度值f 精确至0.1MPa。

    1汇总各地区的试验数据,按照各强度等级各 龄期的每个试件的回弹代表值R、碳化深度值αm 抗压强度值f。一一对应列表进行整理; 2采用最小二乘法的原理按以下函数关系式进 行拟合回归分析:

    指数函数 f%=a·e(b.Rm+ecdm)

    式中:f°一一试件抗压强度换算值; R一一试件回弹代表值; 3计算各函数关系式的平均相对误差()和相 对标准差(e),平均相对误差()不应大于土14.0% 相对标准差(e.)不应大于17.0%。

    A.0.6选取相对标准差和平均相对误差较小且理论

    A.0.6选取相对标准差和平均相对误差较小且理论 分析比较合理的函数关系式作为本地区测强曲线公 式。

    根据选定的测强曲线公式,由测区回弹代表值 和碳化深度值计算出测区混凝土强度换算值,列出 则区混凝土强度换算表,供速查使用。由第个测区 的回弹代表值R和碳化深度值αm按表B可直接查

    表B测区混凝土强度换算表

    续表B测区测区混凝土强度换算值f(MPa)回弹测区平均碳化深度值dm(mm)代表0.00.51.01.52.02.53.03.54.04.55.05.5≥6.0值R23.116.716.315.815.415.023.216.816.416.015.515.123.317.016.516.115.715.323.417.116.716.215.815.415.023.517.316.816.415.915.515.123.617.416.916.516.115.615.223.717.517.116.616.215.815.423.817.717.216.816.315.915.515.123.917.817.416.916.516.015.615.224.018.017.517.016.616.215.715.324.118.117.617.216.716.315.915.415.024.218.317.817.316.916.416.015.615.224.318.417.917.517.016.516.115.715.324.418.618.117.617.116.716.215.815.415.024.518.718.217.717.316.816.415.915.515.124.618.918.417.917.416.916.516.115.615.224.719.018.518.017.517.116.616.215.815.324.819.118.618.217.717.216.816.315.915.515.124.919.318.818.317.817.316.916.416.015.615.225.019.418.918.417.917.517.016.616.115.715.329

    续表B测区测区混凝土强度换算值fa(MPa)回弹测区平均碳化深度值dm(mm)代表0.00.51.01.52.02.53.03.54.04.55.05.5值R6.025.119.619.118.618.117.617.116.716.315.815.415.025.219.719.218.718.217.717.316.816.415.915.515.125.319.919.418.918.417.917.417.016.516.115.615.225.420.119.519.018.518.017.517.116.616.215.815.425.520.219.719.218.618.217.717.216.816.315.915.515.125.620.419.819.318.818.317.817.316.916.416.015.615.225.720.520.019.418.918.417.917.517.016.616.115.715.325.820.720.119.619.118.618.117.617.116.716.215.815.415.025.920.820.319.719.218.718.217.717.316.816.415.915.515.126.021.020.419.919.418.818.417.917.416.916.516.115.615.226.121.120.620.019.519.018.518.017.517.116.616.215.715.326.221.320.720.219.619.118.618.117.717.216.716.315.915.426.321.420.920.319.819.318.818.317.817.316.916.416.015.626.421.621.020.519.919.418.918.417.917.417.016.516.115.726.521.821.220.620.119.619.018.518.017.617.116.716.215.826.621.921.320.820.219.719.218.718.217.717.216.816.315.926.722.121.520.920.419.819.318.818.317.817.416.916.516.026.822.221.621.120.520.019.518.918.418.017.517.016.616.126.922.421.821.220.720.119.619.118.618.117.617.116.716.327.022.622.021.420.820.319.719.218.718.217.717.316.816.430

    续表B测区测区混凝土强度换算值fa(MPa)回弹测区平均碳化深度值dm(mm)代表0.00.51.01.52.02.53.03.54.04.55.05.5值R6.027.122.722.121.521.020.419.919.418.818.317.917.416.916.527.222.922.321.721.120.620.019.519.018.518.017.517.116.627.323.022.421.821.320.720.219.619.118.618.117.617.216.727.423.222.622.021.420.820.319.819.218.718.217.817.316.827.523.422.722.121.621.020.419.919.418.918.417.917.417.027.623.522.922.321.721.120.620.019.519.018.518.017.517.127.723.723.122.521.921.320.720.219.719.118.618.117.717.227.823.923.222.622.021.420.920.319.819.318.818.317.817.327.924.023.422.822.221.621.020.519.919.418.918.417.917.428.024.223.622.922.321.721.220.620.119.519.018.518.017.628.124.423.723.122.521.921.320.720.219.719.218.618.217.728.224.523.923.222.622.021.520.920.319.819.318.818.317.828.324.724.023.422.822.221.621.020.519.919.418.918.417.928.424.924.223.622.922.321.821.220.620.119.519.018.518.028.525.024.423.723.122.521.921.320.820.219.719.218.718.228.625.224.523.923.322.622.021.520.920.319.819.318.818.328.725.424.724.023.422.822.221.621.020.519.919.418.918.428.825.524.924.223.622.922.321.821.220.620.119.619.018.528.925.725.024.423.723.122.521.921.320.820.219.719.218.729.025.925.224.523.923.322.622.021.520.920.319.819.318.831

    续表B测区测区混凝土强度换算值fa(MPa)回弹测区平均碳化深度值dm(mm)代表0.00.51.01.52.02.53.03.54.04.55.05.5值R6.029.126.125.424.724.023.422.822.221.621.020.519.919.418.929.226.225.524.924.223.622.922.321.821.220.620.119.519.029.326.425.725.024.423.723.122.521.921.320.820.219.719.229.426.625.925.224.523.923.222.622.021.520.920.319.819.329.526.726.025.424.724.023.422.822.221.621.020.519.919.429.626.926.225.524.824.223.622.922.321.721.220.620.119.529.727.126.425.725.024.323.723.122.521.921.320.720.219.729.827.326.625.925.224.523.923.222.622.021.420.920.319.829.927.426.726.025.324.724.023.422.822.221.621.020.519.930.027.626.926.225.524.824.223.522.922.321.721.120.620.030.127.827.126.425.725.024.323.723.122.521.921.320.720.230.228.027.226.525.825.124.523.823.222.622.021.420.920.330.328.227.426.726.025.324.624.023.422.722.121.621.020.430.428.327.626.926.225.524.824.123.522.922.321.721.120.630.528.527.827.026.325.625.024.323.723.022.421.821.320.730.628.727.927.226.525.825.124.423.823.222.622.021.420.830.728.928.127.426.726.025.324.624.023.322.722.121.521.030.829.128.327.526.826.125.424.824.123.522.922.221.721.130.929.228.527.727.026.325.624.924.323.623.022.421.821.231.029.428.627.927.226.425.725.124.423.823.122.521.921.432

    续表B测区测区混凝土强度换算值fa(MPa)回弹测区平均碳化深度值dm(mm)代表0.00.51.01.52.02.53.03.54.04.55.05.57值R6.031.129.628.828.127.326.625.925.224.623.923.322.722.121.531.229.829.028.227.526.826.125.424.724.123.422.822.221.631.330.029.228.427.726.926.225.524.924.223.622.922.321.831.430.229.428.627.827.126.425.725.024.423.723.122.521.931.530.329.528.828.027.326.625.925.224.523.923.222.622.031.630.529.728.928.227.426.726.025.324.724.023.422.822.231.730.729.929.128.427.626.926.225.524.824.223.522.922.331.830.930.129.328.527.827.026.325.625.024.323.723.022.431.931.130.329.528.727.927.226.525.825.124.423.823.222.632.031.330.529.728.928.127.426.625.925.324.623.923.322.732.131.530.629.829.028.327.526.826.125.424.724.123.522.832.231.730.830.029.228.427.727.026.325.624.924.223.623.032.331.831.030.229.428.627.927.126.425.725.024.423.723.132.432.031.230.429.628.828.027.326.625.925.224.523.923.332.532.231.430.529.729.028.227.526.726.025.324.724.023.432.632.431.630.729.929.128.427.626.926.225.524.824.223.532.732.631.730.930.129.328.527.827.026.325.625.024.323.732.832.831.931.130.329.528.727.927.226.525.825.124.523.832.933.032.131.330.529.728.928.127.426.625.925.324.623.933.033.232.331.530.629.829.028.327.526.826.125.424.724.133

    续表B测区测区混凝土强度换算值fa(MPa)回弹测区平均碳化深度值dm(mm)代表0.00.51.01.52.02.53.03.54.04.55.05.5值R6.033.133.432.531.630.830.029.228.427.727.026.225.624.924.233.233.632.731.831.030.229.428.627.827.126.425.725.024.433.333.832.932.031.230.329.528.828.027.326.625.925.224.533.434.033.132.231.430.529.728.928.227.426.726.025.324.733.534.233.332.431.530.729.929.128.327.626.926.225.524.833.634.433.532.631.730.930.129.328.527.727.026.325.624.933.734.633.632.831.931.130.229.428.727.927.226.525.825.133.834.833.832.932.131.230.429.628.828.127.326.625.925.233.935.034.033.132.331.430.629.829.028.227.526.826.125.434.035.134.233.332.431.630.829.929.228.427.626.926.225.534.135.334.433.532.631.830.930.129.328.527.827.126.325.734.235.534.633.732.831.931.130.329.528.728.027.226.525.834.335.734.833.933.032.131.330.529.728.928.127.426.625.934.436.035.034.133.232.331.530.629.829.028.327.526.826.134.536.235.234.333.432.531.630.830.029.228.427.726.926.234.636.435.434.533.632.731.831.030.229.428.627.827.126.434.736.635.634.733.732.932.031.130.329.528.728.027.226.534.836.835.834.833.933.032.231.330.529.728.928.127.426.734.937.036.035.034.133.232.331.530.729.929.128.327.626.835.037.236.235.234.333.432.531.730.830.029.228.527.727.034

    续表B测区测区混凝土强度换算值fa(MPa)回弹测区平均碳化深度值dm(mm)代表0.00.51.01.52.02.53.03.54.04.55.05.5值R6.035.137.436.435.434.533.632.731.831.030.229.428.627.927.135.237.636.635.634.733.832.932.031.230.329.528.828.027.335.337.836.835.834.934.033.132.231.330.529.728.928.227.435.438.037.036.035.134.133.232.431.530.729.929.128.327.635.538.237.236.235.334.333.432.531.730.830.029.228.527.735.638.437.436.435.434.533.632.731.931.030.229.428.627.935.738.637.636.635.634.733.832.932.031.230.429.628.828.035.838.837.836.835.834.934.033.132.231.430.529.728.928.235.939.038.037.036.035.134.133.232.431.530.729.929.128.336.039.238.237.236.235.334.333.432.531.730.930.029.228.536.139.438.437.436.435.534.533.632.731.931.030.229.428.636.239.738.637.636.635.634.733.832.932.031.230.429.628.836.339.938.837.836.835.834.934.033.132.231.430.529.728.936.440.139.038.037.036.035.134.133.232.431.530.729.929.136.540.339.238.237.236.235.334.333.432.531.730.830.029.236.640.539.438.437.436.435.434.533.632.731.931.030.229.436.740.739.638.637.636.635.634.733.832.932.031.230.429.636.840.939.938.837.836.835.834.934.033.132.231.330.529.736.941.140.139.038.037.036.035.134.133.232.431.530.729.937.041.440.339.238.237.236.235.234.333.432.531.730.830.035

    续表B测区测区混凝土强度换算值fa(MPa)回弹测区平均碳化深度值dm(mm)代表0.00.51.01.52.02.53.03.54.04.55.05.5值R6.037.141.640.539.438.437.436.435.434.533.632.731.831.030.237.241.840.739.638.637.636.635.634.733.832.932.031.230.337.342.040.939.838.837.836.835.834.833.933.032.231.330.537.442.241.140.039.037.936.936.035.034.133.232.331.530.637.542.441.340.239.238.137.136.235.234.333.432.531.630.837.642.741.540.439.438.337.336.335.434.533.532.731.831.037.742.941.840.739.638.537.536.535.634.633.732.832.031.137.843.142.040.939.838.737.736.735.834.833.933.032.131.337.943.342.241.140.038.937.936.935.935.034.133.232.331.438.043.542.441.340.239.138.137.136.135.234.233.332.531.638.143.842.641.540.439.338.337.336.335.334.433.532.631.838.244.042.841.740.639.538.537.536.535.534.633.732.831.938.344.243.041.940.839.738.737.736.735.734.833.833.032.138.444.443.342.141.039.938.937.836.935.934.934.033.132.238.544.743.542.341.240.139.138.037.036.135.134.233.332.438.644.943.742.541.440.339.338.237.236.235.334.433.532.638.745.143.942.841.640.539.538.437.436.435.534.533.632.738.845.344.143.041.840.739.738.637.636.635.634.733.832.938.945.544.343.242.040.939.938.837.836.835.834.934.033.139.045.844.643.442.241.140.139.038.037.036.035.034.133.236

    续表B测区测区混凝土强度换算值fa(MPa)回弹测区平均碳化深度值dm(mm)代表0.00.51.01.52.02.53.03.54.04.55.05.5值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

    续表B测区测区混凝土强度换算值fa(MPa)回弹测区平均碳化深度值dm(mm)代表0.00.51.01.52.02.53.03.54.04.55.05.5值R6.041.150.649.348.046.745.544.343.142.040.939.838.837.736.841.250.949.548.247.045.744.543.342.241.140.038.937.936.941.351.149.848.547.245.944.743.542.441.340.239.138.137.141.451.450.048.747.446.144.943.742.641.540.439.338.337.341.551.650.248.947.646.445.144.042.841.740.639.538.537.441.651.850.549.147.846.645.444.243.041.940.839.738.637.641.752.150.749.448.146.845.644.443.242.140.939.938.837.841.852.350.949.648.347.045.844.643.442.241.140.039.038.041.952.651.249.848.547.246.044.843.642.441.340.239.238.142.052.851.450.048.747.446.245.043.842.641.540.439.438.342.153.051.650.349.047.746.445.244.042.841.740.639.538.542.253.351.950.549.247.946.645.444.243.041.940.839.738.742.353.552.150.749.448.146.845.644.443.242.141.039.938.842.453.852.351.049.648.347.045.844.643.442.341.240.139.042.554.052.651.249.948.547.346.044.843.642.541.340.339.242.654.352.851.450.148.847.546.245.043.842.741.540.439.442.754.553.151.750.349.047.746.445.244.042.941.740.639.642.854.753.351.950.549.247.946.645.444.243.041.940.839.742.955.053.552.150.849.448.146.845.644.443.242.141.039.943.055.253.852.451.049.648.347.145.844.643.442.341.240.138

    续表B测区测区混凝土强度换算值fa(MPa)回弹测区平均碳化深度值dm(mm)代表0.00.51.01.52.02.53.03.54.04.55.05.5值R6.043.155.554.052.651.249.948.647.346.044.843.642.541.440.343.255.754.352.851.450.148.847.546.245.043.842.741.540.543.356.054.553.151.750.349.047.746.445.244.042.941.740.643.456.254.853.351.950.549.247.946.645.444.243.141.940.843.556.555.053.552.150.849.448.146.945.644.443.242.141.043.656.755.253.852.451.049.648.347.145.844.643.442.341.243.757.055.554.052.651.249.948.547.346.044.843.642.541.443.857.255.754.352.851.450.148.847.546.245.043.842.741.543.957.556.054.553.151.750.349.047.746.445.244.042.941.744.057.756.254.753.351.950.549.247.946.645.444.243.041.944.158.056.555.053.552.150.749.448.146.845.644.443.242.144.258.256.755.253.852.351.049.648.347.045.844.643.442.344.358.557.055.554.052.651.249.848.547.246.044.843.642.544.458.857.255.754.252.851.450.148.747.546.245.043.842.644.559.057.555.954.553.051.650.348.947.746.445.244.042.844.659.357.756.254.753.351.950.549.247.946.645.444.243.044.759.558.056.454.953.552.150.749.448.146.845.644.443.244.859.858.256.755.253.752.350.949.648.347.045.844.643.444.958.556.955.454.052.551.149.848.547.246.044.843.645.058.757.255.654.252.851.450.048.747.446.244.943.839

    续表B测区测区混凝土强度换算值fa(MPa)回弹测区平均碳化深度值dm(mm)代表0.00.51.01.52.02.53.03.54.04.55.05.5值R6.045.159.057.455.954.453.051.650.248.947.646.445.143.945.259.257.656.154.653.251.850.449.147.846.645.344.145.359.557.956.454.953.452.050.749.348.046.845.544.345.459.758.156.655.153.752.250.949.548.247.045.744.545.558.456.855.353.952.551.149.748.447.245.944.745.658.657.155.654.152.751.349.948.647.446.144.945.758.957.355.854.352.951.550.248.847.646.345.145.859.157.656.154.653.151.750.449.047.846.545.345.959.457.856.354.853.452.050.649.348.046.745.546.059.658.156.555.053.652.250.849.548.246.945.646.159.958.356.855.353.852.451.049.748.447.145.846.258.557.055.554.052.651.249.948.647.346.046.3一58.857.255.754.352.851.450.148.847.546.246.459.057.556.054.553.051.750.349.047.746.446.559.357.756.254.753.351.950.549.247.946.646.659.558.056.454.953.552.150.749.448.146.846.759.858.256.755.253.752.350.949.648.347.046.858.456.955.453.952.551.149.848.547.246.958.757.155.654.252.751.350.048.747.447.058.957.455.854.452.951.550.248.947.640

    续表B测区测区混凝土强度换算值fa,(MPa)回弹测区平均碳化深度值dm(mm)代表0.00.51.01.52.02.53.03.54.04.55.05.5值R6.047.159.257.656.154.653.251.850.449.147.847.2一59.457.856.354.853.452.050.649.348.047.359.658.156.555.053.652.250.849.548.247.459.958.356.855.353.852.451.049.748.447.558.557.055.554.052.651.249.948.647.658.857.255.754.352.851.450.148.847.759.057.555.954.553.051.650.349.047.859.357.756.254.753.351.850.549.247.959.557.956.454.953.552.150.749.348.059.758.256.655.153.752.350.949.548.158.456.955.453.952.551.149.748.258.657.155.654.152.751.349.948.358.957.355.854.352.951.550.148.459.157.556.054.553.151.750.348.559.357.856.254.853.351.950.548.659.658.056.555.053.552.150.748.759.858.256.755.253.752.350.948.858.556.955.454.052.551.148.958.757.155.654.252.751.449.058.957.455.954.452.951.641

    续表B测区测区混凝土强度换算值fa(MPa)回弹测区平均碳化深度值dm(mm)代表0.00.51.01.52.02.53.03.54.04.55.05.5值R6.049.159.257.656.154.653.251.849.2一一一59.457.856.354.853.452.049.3一59.658.056.555.053.652.249.459.858.356.755.253.852.449.5一58.557.055.554.052.649.6一58.757.255.754.252.849.759.057.455.954.453.049.859.257.656.154.653.249.959.457.856.354.853.450.059.658.156.555.053.650.1一59.958.356.855.353.850.258.557.055.554.050.358.757.255.754.250.459.057.455.954.450.559.257.656.154.650.659.457.956.354.850.759.658.156.555.150.859.958.356.855.350.958.557.055.551.058.757.255.742

    续表B测区测区混凝土强度换算值feu(MPa)回弹测区平均碳化深度值dm(mm)代表0.00.51.01.52.02.53.03.54.04.55.05.5≥6.0值R51.159.057.455.951.259.257.656.151.359.457.856.351.459.658.156.551.559.858.356.751.658.556.951.758.757.251.858.957.451.959.157.652.059.457.852.159.658.052.259.858.2 52.358.452.458.752.558.952.659.152.759.352.859.552.959.753.0注:表中未注明(即“一”的测区混凝土强度换算值为:15.0MPa或≥60.0MPa。43

    附录C非水平方向检测时的回弹值修正值

    表C非水平方向检测时的回弹值修正值

    附录D回弹法检测泵送混凝土抗压强度报告D.0.1《回弹法检测泵送混凝土抗压强度报告》的编写格式见表D.0.1。表D.0.1[回弹法检测泵送混凝土抗压强度报告委托单位:报告编号:工程名称:龄期(d):构件部位:检测依据:设计强度:检测仪器:仪器编号:检测日期:报告日期:构件名称测区计算数据(MPa)轴线编号平均值标准差最小值推定值批量推定混凝土抗压强度检测构件测区最小值平均值标准差抗压强度推数数(MPa)(MPa)(MPa)定值(MPa)备注:批准:审核:校核:检测:46

    D.0.2《回弹法检测泵送混凝土抗压强度报告》的原始记录编写格式见表D.0.2。表D.0.2回弹法检测泵送混凝土抗压强度原始记录委托单位:记录编号:工程名称:环境温度:构件编号:检测日期:检测仪器:仪器编号:碳化深度读数(mm)测区编号回弹值碳化深度平1#2#3#均值(mm)测区1测区 2测区 3测区10.)()(()()(2率定试验()()(()()()备注碳化深度测量仪编号:(钢砧编号:(温度计编号:()测试:记录:校核:47

    1为便于在执行本标准条文时区别对待,对要求严格 程度不同的用词说明如下: 1)表示很严格,非这样做不可的: 正面词采用“必须”,反面词采用“严禁”; 2)表示严格,在正常情况下均应该这样做的: 正面词采用“应”,反面词采用“不应”或“不得” 3)表示充许稍有选择,在条件许可时首先应这样做的 止面词采用“宜”,反面词采用“不宜”; 4)表示有选择,在一定条件下可以这样做的用词,采用 “可”。 2条文中指明应按其他有关标准执行的写法为:“应 按...执行”或“应符合...要求或规定”

    1为便于在执行本标准条文时区别对待,对要求严格 程度不同的用词说明如下: 1)表示很严格,非这样做不可的: 正面词采用“必须”,反面词采用“严禁”; 2)表示严格,在正常情况下均应该这样做的: 正面词采用“应”,反面词采用“不应”或“不得” 3)表示充许稍有选择,在条件许可时首先应这样做的 止面词采用“宜”,反面词采用“不宜”; 4)表示有选择,在一定条件下可以这样做的用词,采用 “可”。 2条文中指明应按其他有关标准执行的写法为:“应 按执行”或“应符合要求或规定”

    7 《建筑结构检测技术标准》GB/T50344 2 《回弹仪》GB/T9138 3 《回弹法检测混凝土抗压强度技术规程》JGJ/T23 4 《钻芯法检测混凝土强度技术规程》JGJ/T384 5 国家计量检定规程《回弹仪》JJG817 6 《超声回弹综合法检测混凝土抗压强度技术规程》 T/CECS02

    回弹法检测泵送混凝土抗压强度

    现行行业技术规程、先进技术标准,开以多种方式 泛征求了有关单位和专家的意见,对主要问题进 行了反复讨论、协调和修改。本规程的编制为回弹 法检测广东地区按泵送施工要求配制混凝土的抗压 强度在实际工程中的推厂应用提供了技术依据。 为便于厂大检测、鉴定、设计、施工、科研、 学校等单位有关人员在使用本规程时能正确理解和 执行条文规定,编制组按章、节、条顺序编制了本 规程的条文说明 方便面标准,对条文规定的目的、依据以及执 仃中需注意的有关事项进行了说明。但是,本条文 说明不具备与标准正文同等的法律效力,仅供使用 者作为理解和把握规程规定的参考

    目次1 总则54回弹仪3593.1技术要求593.2检定和率定.613.3保养.634检测技术.664.1般规定.664.2回弹值测量与计算,.704.3碳化深度值测量.715测强曲线746混凝土强度的推定.7853

    1.0.1统一标称能量为2.207J的M225型回弹仪检 测方法,保证回弹法检测广东地区按照泵送施工要 求配制的混凝土抗压强度结果的可靠性是本规程制 定的目的。

    1.0.2由于回弹法是通过回弹仪检测混凝土表面硬

    度从而推算出混凝土强度的方法,因此,不适用于 表层与内部质量有明显差异或内部存在缺陷的混凝 土构件的检测。 本规程所述的混凝土材料是符合现行国家有关 标准的、由广东地区商品混凝土生产企业制作的混 疑土,未对采用如离心法、真空法、压浆法、喷射 法等特种成型工艺制作的混凝土开展试验研究;构 件生产中,有的并非一般机械成型工艺可以完成, 列如混凝土轨枕,上、下水管道等,就需采用加压 振动或离心法成型工艺,超出了本规程测强曲线的

    适用范围。 国内、外试验研究表明食用盐标准,普通混凝土所用细骨料 的品种和粒径只要符合《普通混凝土用砂、石质量 及检验方法标准》JGJ52的规定,对回弹法测强没 有显著影响。对于再生混凝土、高性能混凝土,使 用本规程检测前应进行验证。 混凝土表面湿度对回弹法测强影响很大,应等待 混凝土表面十燥后再进行检测。粗骨料最大公称粒 径大于31.5mm时,已超出制本规程测强曲线时 听用混凝土粗骨料的最大粒径;泵送混凝土粗骨料 最大公称粒径大于31.5mm时已不能满足泵送的要 求。对于在非平面的构件上测得的回弹值与在平面 上测得的回弹值关系,国内目前尚无试验资料,现 参照国外资料,规定凡测试部位的曲率半径小于 250mm的构件一律不能采用本规程测强曲线。 可弹法的测试结果与混凝土的设计强度等级没 有直接关系,但实际工程中一般需将回弹法检测结 果与设计强度等级进行比较。本规程结合测强曲线

    的区间范围(混凝土抗压强度≥15.0MPa且< 50.0MPa)及实际需要,给出适用范围的混凝土强度 等级为 C15~C60 本规程对强度等级为C15~C60混凝土进行抗 压强度检测,在实际工程应用中,对于临界条件下 不同回弹仪的选择,给出以下建议: 混凝土设计强度等级小于C60,且现场预留混 疑土试块抗压强度代表值低于60.0MPa时,建议采 用本规程M225型回弹仪进行检测: 如现场没有预留混凝土试块,或者混凝土试块 抗压强度代表值没有代表性,混凝土实际强度在 60.0MPa左右时,建议采用M225型回弹仪和H450 型回弹仪对部分构件分别进行预估检测,根据预估 检测结果选择回弹仪: 1当两种回弹仪的检测结果都小于60.0MPa 时,采用M225型回弹仪; 2当两种回弹仪的检测结果都不小于 60.0MPa时,采用H450 型回弹仪;

    3当两种回弹仪的检测结果不一致时,采用其 也有效法(如:钻心法等)进行检测。 1.0.3通常情况下,混凝土强度的验收和评定应按 现行国家标准《混凝土结构工程施工及验收规范》 GB50204及《混凝土强度检验评定标准》GB/T5010 的规定,采用标准养护试件的抗压强度来检验混凝 土的强度质量,不允许用本规程的方法取代国家标 准对制作混凝士标准养护试件的要求。因此,按本 规程检测所推定的混凝士抗压强度,不能等同于施 L现场取样成型并标准养护28d或设计规定龄期所 得的混凝土试件抗压强度。但是,混凝土试件强度 评定不合格时,可按本规程检测方法推定结构中的 混凝土强度,并可作为结构是否需要处理的依据; 对使用中的结构需要检测混凝土强度,或者在混凝 土工程施工过程中出现下列情况时,可按本规程检 测方法推定混凝土强度: 1同条件养护立方体试件的试验结果不能满足 设计要求;

    ....
  • 检测标准
  • 相关专题: 回弹法  

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