DBJ∕T 15-211-2021 回弹法检测泵送混凝土抗压强度技术规程_第1页
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DBJ/T15-211-2021备案号J15563-2021Technicalspecificationforcompressivestrengthtestingofpumpedconcretebyreboundmethod2021-02-02发布TechnicalspecificationforcompressivestrengthtestingofpumpedconcretebyreboundmethodDBJ/T15-211-2021住房城乡建设部备案号:J15563-2021批准部门:广东省住房和城乡建设厅施行日期:2021年4月1日粤建公告〔2021〕10号经组织专家委员会审查,现批准《回弹法检测泵送本标准由广东省住房和城乡建设厅负责管理,由主编单位负责具体技术内容的解释,并在广东省住房和城根据《广东省住房和城乡建设厅关于发布<2015年广东省工程建设标准制订和修订计划>的通知》(粤建科函〔2015〕2367号编制组经过广泛的调查研究,认真总结实践经验,参考有关标准,并在广泛征求意见的基础上,编制了本规程。本规程的主要技术内容是:1.总则;2.术语和符号;3.回弹仪;4.检测技术;5.测强曲线;6.混凝土强度的推定。本规程由广东省住房和城乡建设厅负责管理,由主编单位负责具体技术内容的解释。执行过程中如有意见或建议,请寄送广东省建筑科学研究院集团股份有限公司(地址:广州市先烈东路121号,主编单位:广东省建筑科学研究院集团股份有限公司广东省建设工程质量安全检测总站有限公司参编单位:华南理工大学广州市建设工程质量监督站广州市增城区建设工程质量安全监督站珠海市横琴新区建设工程质量监督检测站中山市建设工程质量监督站中山市建设工程质量检测中心有限公司东莞市建设工程质量监督站东莞市建设工程质量检测中心深圳市龙岗区工程质量监督检验站清远市建设工程质量检测站佛山市顺德区建设工程质量安全监督检测中心佛山市禅城区建设工程质量安全检测站广州建设工程质量安全检测中心有限公司广州市芳联混凝土有限公司东莞市广创混凝土有限公司清远市键发混凝土有限公司深圳市为海建材有限公司主要起草人员:邓浩高望清李操曾宏何胜华王潇宇杨映云杨春张勇曾庆鹏黄腾霄张志忠彭立才王金环徐鹏曹伟倪东高徐伟峰孔怀胜孙志东郑惠华邝文浩洪亮陈恩乐孔宪文祁森郑永民陈景忠丁江澍熊凯峰郑靓梁天宇朵润民杨华星林国光欧国雄杨根宏主要审查人员:蔡健汪四新李宏山邓建荣黄健朱跃武李向涛 2术语和符号 32.1术语 32.2符号 4 63.1技术要求 63.2检定和率定 73.3保养 4检测技术 4.1一般规定 114.2回弹值测量与计算 4.3碳化深度值测量 5测强曲线 6混凝土强度的推定 20附录A本规程地区测强曲线的制定方法 25附录B测区混凝土强度换算表 28附录C非水平方向检测时的回弹值修正值 46附录D回弹法检测泵送混凝土抗压强度报告 46本规程用词说明 48引用标准名录 49 501GeneralProvisions 2TermsandSymbols 2.1Terms 32.2Symbols 43ReboundHammer 63.1TechnicalRequirements 63.2VerificationandCalibration 73.3Maintenance 4TestingTechnology 4.1GeneralRequirements 4.2ReboundValueMeasurementandCalculation 4.3CarbonationDepthMeasurement 5TestingStrengthCurve 6EstimationofCompressiveStrengthforConcrete 20AppendixAMethodofFormulatingTestingStrengthCurvefortheAreaSpecification..................................25AppendixBConversionTableofCompressiveStrengthofConcreteforTestArea.......................................28AppendixCModifiedValueofReboundValueunderNon-horizontalTesting......................................44AppendixDTestReportofCompressiveStrengthforPumpedConcretebyReboundMethod..........................46ExplanationofWordinginThisSpecification 48ListofQuotedStandards 49Addition:ExplanationofProvisions 5011.0.1为保证广东地区工程结构中泵送混凝土抗压1.0.2本规程适用于广东地区工程结构中强度等级为C15~C60泵送混凝土抗压强度的检测。本规程1遭受严重冻伤、化学侵蚀、火灾等而导致表5检测部位曲率半径小于250mm的混凝土构7所处环境温度低于0℃或高于40℃的混凝土2本规程进行检测,其强度推定结果可作为混凝土结1.0.4采用本规程检测及推定混凝土强度时,除应3按检测方法要求,在被检测的混凝土构件上布2.1.3测区混凝土强度换算值conversionvalueofconcretecompressivestrengthoftestingarea根据测区混凝土的回弹代表值和碳化深度值,通过测强曲线或测区混凝土强度换算表得到的该测2.1.4混凝土强度推定值estimationvalueofstrength测区混凝土强度换算值总体分布中保证率不低4fc,i——第i个测区的测区混凝土强度换算值;fcor,i——第i个混凝土芯样试件的抗压强度;fcu,i——第i个同条件养护立方体试件的抗压强度;fc,i0——修正前第i测区的混凝土强度换算值;fc,i1——修正后第i测区的混凝土强度换算值;fc,min——构件的测区混凝土强度换算值的最小值;fcu,e——混凝土强度推定值;563.1.1本规程测定回弹值的仪器应采用标称能量为2.207J的回弹仪,回弹仪可为指针直读式的,也可3.1.2回弹仪应具有产品合格证及计量合格证书,并应在回弹仪的明显位置上标注名称、型号、制造2数字式回弹仪应带有指针直读示值系统,数字显示的回弹值与指针直读示值相差不应超过1,73.2.1回弹仪检定或校准周期为6个月,当遇有下列情况之一时,回弹仪应送有资质的计量机构按现4数字式回弹仪数字显示的回弹值与指针直读3.2.2当遇有下列情况之一时,回弹仪应在钢砧上1每个检测项目在使用回弹仪检测之前和之81钢砧表面应干燥、清洁,并应稳固地平放在2回弹仪的弹击杆通过钢砧的导向套筒,使其端部球面与砧芯接触,回弹仪应垂直于接触面连续5回弹仪四个方向的率定值均满足本规程第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93.3.2回弹仪的保养应由通过专业培训的人员按下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2擦拭清洁机芯各零部件,并应重点清理中心3保养完成并组装仪器后应按本规程第3.2.34对于数字式回弹仪,还应按产品要求的维护1经过清理的零部件,除应在中心导杆上薄薄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4.1.1使用回弹仪进行工程检测的人员,应经专业1工程名称及建设、设计、施工、监理单位名2构件名称、数量、部位及混凝土制备工艺、3水泥品种、强度等级、安定性,砂石品种、4.1.3采用回弹法检测混凝土强度,可按单个构件2受检构件某一方向尺寸不大于4.5m且另一2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,也可布置在同一4测区应均匀分布,相邻两测区的间距不应大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7测区应标有清晰的编号,并宜在记录纸上绘4.1.6按批抽样检测时,同时符合下列条件的构件1混凝土设计强度等级、配合比和成型工艺相4.1.7对同批构件按批抽样检测时,应符合下列规2抽样数量不宜少于同批构件总数的30%且不的规定进行调整,但抽检的构件总数不宜少于10GB/T50344的规定进行同批构件混凝土的强度推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,对同批构件混凝土,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1采用同条件养护立方体试件修正时,试件数2采用混凝土芯样试件修正时,芯样数量应符的数量不应少于9个。钻芯位置应在回弹测区内,3同一测点应只弹击一次,每一测点的回弹值4对于弹击时产生颤动的薄壁、小型构件,应相邻两测点的净距离不宜小于20mm;测点距外露值中,应先剔除3个最大值和3个最小值,然后将(4.2.3)Ri——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R=Rα+Raα(4.2.4)式中:Rα——非水平方向检测时测区回弹代表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2.0mm时,应在该构件每一测区分别测量碳化深度2应清除孔洞中的粉末和碎屑,且不得用水擦3应采用浓度为1%~2%的酚酞酒精溶液滴在应采用碳化深度测量仪测量已碳化与未碳化混凝土交界面到混凝土表面的垂直距离,并应测量3次,4应取三次测量的平均值作为该测区的碳化深度值dm,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2砂、石应符合现行行业标准《普通混凝土用3混凝土采用的外加剂、掺合料、拌合用水等4混凝土施工时采用的模板符合现行国家标准fc,i=0.039612R1.925010-0.0232dm(6.0.1)式中:fc,i——第i测区混凝土强度换算值(MPaR——测区回弹代表值,精确至0.1;fcor,i-(6.0.2-1)fcu,i-(6.0.2-2)式中:Δtot——测区混凝土强度换算值修正量fcor,i——第i个混凝土芯样试件的抗压强度,fcu,i——第i个同条件养护立方体试件的抗fc.i——对应于第i个芯样部位或同条件养护立方体试件的测区混凝土强度换算值,精确到2测区混凝土强度换算值的修正应按下式计fc,i1=fc,i0+Δtot(6.0.2-3)式中:fc,i0——第i测区修正前的混凝土强度换算值fc,i1——第i测区修正后的混凝土强度换算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,测区混凝土强度换算值的平均值和标准差应按式中:mf——测区混凝土强度换算值的平均值sf——测区混凝土强度换算值的标准差n——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6.0.4按单个构件检测时,构件的现龄期混凝土强f算值中出现≥60.0MPa时,该构件的混凝土强度推fcu,e=fc,min(6.0.4-1)式中:fc,min——构件的测区混凝土强度换算值的),2测区混凝土强度换算值全部大于或等于60.0MPa时,该构件的混凝土强度推定值应按下式fcu,e≥60.0MPa(6.0.4-2)3测区混凝土强度换算值中出现<15.0MPafcu,e<15.0MPa(6.0.4-3)fcu,e=mf-1.645Sf(6.0.4-4)6.0.5按批抽样检测时,同批构件的现龄期混凝土ffcu,e=mf-1.645Sf(6.0.5)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1该批构件的测区混凝土强度换算值的平均值(mf)小于25.0MPa时,标准差(sfu)大于2该批构件的测区混凝土强度换算值的平均值(mf)不小于25.0MPa且不大于66.0.7回弹法检测泵送混凝土抗压强度报告及其原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料等原材料,制作强度等级为C15~C60、边长为规定的试模,各强度等级均采用同一盘混凝土均匀2每个地区各强度等级的混凝土制作24组试2擦净被测试件,以浇筑侧面的两个相对面置3在试件保持压力下,采用符合本规程第3.1方法,在试件两个相对浇筑侧面上进行回弹测试;度值dm,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的规定进行抗压强将试件加荷至破坏,计算试件的抗压强度值fcu,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dm、抗压强度值fcu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指数及幂函数fc=a.Rmb10c.dm(A.0.5-1)一次及幂函数fc=a.Rm+b.dm0.5+c(A.0.5-2)一次函数fc=a.Rm+b.dm+c(A.0.5-3)指数函数fc=a.e(b.Rm+c.dm)(A.0.5-4)式中:f——试件抗压强度换算值;dm试件平3计算各函数关系式的平均相对误差(δ)和相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,列出的回弹代表值R和碳化深度值dm按表B可直接查得第i个测区混凝土强度换算值fc,i。测区混凝土强度换算值f(MPa)测区平均碳化深度值dm(mm)21.9————————————22.0————————————22.1————————————22.2———————————22.3———————————22.4———————————22.5——————————22.6——————————22.7 22.8 22.9—————————23.0—————————测区混凝土强度换算值f(MPa)测区平均碳化深度值dm(mm)23.1 23.2 23.3————————23.4———————23.5———————23.6 23.7 23.8——————23.9——————24.0——————24.1 24.2—————24.3—————24.4————24.5————24.6————24.7————24.8———24.9———25.0———测区混凝土强度换算值f(MPa)测区平均碳化深度值dm(mm)25.1 25.2 25.3——25.420.1——25.520.2—25.620.4 25.720.520.0 25.820.720.125.920.820.326.021.020.420.026.221.320.720.226.321.420.920.326.421.621.020.526.521.821.220.620.126.621.921.320.820.226.722.121.520.920.426.822.221.621.120.520.026.922.421.821.220.720.127.022.622.021.420.820.3测区混凝土强度换算值f(MPa)测区平均碳化深度值dm(mm)27.122.722.121.521.020.427.222.922.321.721.120.620.027.323.022.421.821.320.720.227.423.222.622.021.420.820.327.523.422.722.121.621.020.427.623.522.922.321.721.120.620.027.723.723.122.521.921.320.720.227.823.923.222.622.021.420.920.327.924.023.422.822.221.621.020.528.024.223.622.922.321.721.220.623.723.122.521.921.320.723.923.222.622.021.520.920.328.324.724.023.422.822.221.621.020.528.424.924.223.622.922.321.821.220.620.128.525.024.423.723.122.521.921.320.820.228.625.224.523.923.322.622.021.520.920.328.725.424.724.023.422.822.221.621.020.528.825.524.924.223.622.922.321.821.220.620.128.925.725.024.423.723.122.521.921.320.820.229.025.925.224.523.923.322.622.021.520.920.3测区混凝土强度换算值f(MPa)测区平均碳化深度值dm(mm)24.724.023.422.822.221.621.020.524.924.223.622.922.321.821.220.620.129.326.425.725.024.423.723.122.521.921.320.820.229.426.625.925.224.523.923.222.622.021.520.920.329.526.726.025.424.724.023.422.822.221.621.020.529.626.926.225.524.824.223.622.922.321.721.220.620.129.727.126.425.725.024.323.723.122.521.921.320.720.229.827.326.625.925.224.523.923.222.622.021.420.920.329.927.426.726.025.324.724.023.422.822.221.621.020.530.027.626.926.225.524.824.223.522.922.321.721.120.620.030.127.827.126.425.725.024.323.723.122.521.921.320.727.226.525.825.124.523.823.222.622.021.420.920.330.328.227.426.726.025.324.624.023.422.722.121.621.020.430.428.327.626.926.225.524.824.123.522.922.321.721.120.630.528.527.827.026.325.625.024.323.723.022.421.821.320.730.628.727.927.226.525.825.124.423.823.222.622.021.420.830.728.928.127.426.726.025.324.624.023.322.722.121.521.030.829.128.327.526.826.125.424.824.123.522.922.221.721.130.929.228.527.727.026.325.624.924.323.623.022.421.821.231.029.428.627.927.226.425.725.124.423.823.122.521.921.4测区混凝土强度换算值f(MPa)测区平均碳化深度值dm(mm)31.129.628.828.127.326.625.925.224.623.923.322.722.121.531.229.829.028.227.526.826.125.424.724.123.422.822.221.631.330.029.228.427.726.926.225.524.924.223.622.922.321.831.430.229.428.627.827.126.425.725.024.423.723.122.521.931.530.329.528.828.027.326.625.925.224.523.923.222.622.031.630.529.728.928.227.426.726.025.324.724.023.422.822.231.730.729.929.128.427.626.926.225.524.824.223.522.922.331.830.930.129.328.527.827.026.325.625.024.323.723.022.431.931.130.329.528.727.927.226.525.825.124.423.823.222.632.031.330.529.728.928.127.426.625.925.324.623.923.322.732.131.530.629.829.028.327.526.826.125.424.724.123.522.832.231.730.830.029.228.427.727.026.325.624.924.223.623.032.331.831.030.229.428.627.927.126.425.725.024.423.723.132.432.031.230.429.628.828.027.326.625.925.224.523.923.332.532.231.430.529.729.028.227.526.726.025.324.724.023.432.632.431.630.729.929.128.427.626.926.225.524.824.223.532.732.631.730.930.129.328.527.827.026.325.625.024.323.732.832.831.931.130.329.528.727.927.226.525.825.124.523.832.933.032.131.330.529.728.928.127.426.625.925.324.623.933.033.232.331.530.629.829.028.327.526.826.125.424.724.1测区混凝土强度换算值f(MPa)测区平均碳化深度值dm(mm)33.133.432.531.630.830.029.228.427.727.026.225.624.932.731.831.030.229.428.627.827.126.425.725.024.433.333.832.932.031.230.329.528.828.027.326.625.925.224.533.434.030.529.728.928.227.426.726.025.324.733.534.233.332.431.530.729.929.128.327.626.926.225.524.833.634.433.532.631.730.930.129.328.527.727.026.325.624.933.734.633.632.831.928.727.927.226.525.825.133.834.833.832.929.628.828.127.326.625.925.233.935.034.033.132.331.430.629.829.028.227.526.826.125.434.032.431.630.829.929.228.427.626.926.225.534.135.334.433.532.631.830.930.129.328.527.827.126.325.734.235.534.633.732.831.931.130.329.528.728.027.226.525.834.335.734.833.933.032.131.330.529.728.928.127.426.625.934.436.035.031.530.629.829.028.327.526.826.134.533.432.531.630.830.029.228.427.726.926.234.636.435.434.533.632.731.831.030.229.428.627.827.126.434.736.635.634.733.732.932.031.130.329.528.728.027.226.534.836.835.834.833.933.032.231.330.529.728.928.127.426.734.937.036.035.031.530.729.929.128.327.626.835.034.333.432.531.730.830.029.228.527.727.0测区混凝土强度换算值f(MPa)测区平均碳化深度值dm(mm)35.137.436.435.434.533.632.731.831.030.229.428.627.936.635.634.733.832.932.031.230.329.528.828.027.335.337.836.835.834.934.030.529.728.928.227.435.438.037.036.032.431.530.729.929.128.327.635.535.334.333.432.531.730.830.029.228.527.735.638.437.436.435.434.533.632.731.931.030.229.428.627.935.738.637.636.635.634.733.832.932.031.230.429.628.828.035.838.837.836.835.834.934.030.529.728.928.235.939.038.037.036.032.431.530.729.929.128.336.036.235.334.333.432.531.730.930.029.228.536.139.438.437.436.435.534.533.632.731.931.030.229.428.636.239.738.637.636.635.634.733.832.932.031.230.429.628.836.339.938.837.836.835.834.934.030.529.728.936.440.139.038.037.036.032.431.530.729.929.136.540.336.235.334.333.432.531.730.830.029.236.640.539.438.437.436.435.434.533.632.731.931.030.229.436.740.739.638.637.636.635.634.733.832.932.031.230.429.636.840.939.938.837.836.835.834.934.030.529.736.938.037.036.032.431.530.729.937.041.440.333.432.531.730.830.0测区混凝土强度换算值f(MPa)测区平均碳化深度值dm(mm)37.141.640.539.438.437.436.435.434.533.632.731.831.040.739.638.637.636.635.634.733.832.932.031.230.337.342.040.939.838.837.836.835.834.833.933.032.231.330.537.439.037.936.936.035.031.530.637.542.441.334.333.432.531.630.837.642.741.540.439.438.337.336.335.434.533.532.731.831.037.742.941.840.739.638.537.536.535.634.633.732.832.031.137.843.142.040.939.838.737.736.735.834.833.933.032.131.337.943.338.937.936.935.935.031.438.043.542.441.334.233.332.531.638.143.842.641.540.439.338.337.336.335.334.433.532.631.838.244.042.841.740.639.538.537.536.535.534.633.732.831.938.344.243.041.940.839.738.737.736.735.734.833.833.032.138.444.443.342.141.039.938.937.836.935.934.934.044.743.542.338.037.033.332.438.644.943.742.541.440.339.335.334.433.532.638.745.143.942.841.640.539.538.437.436.435.534.533.632.738.845.344.143.041.840.739.738.637.636.635.634.733.832.938.945.544.343.242.040.939.938.837.836.835.834.934.033.139.045.844.643.439.038.037.036.035.034.133.2测区混凝土强度换算值f(MPa)测区平均碳化深度值dm(mm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测区混凝土强度换算值f(MPa)测区平均碳化深度值dm(mm)41.150.649.348.046.745.544.343.142.040.939.838.837.736.841.250.949.548.247.045.744.543.338.937.936.941.351.149.848.547.245.944.743.542.441.337.141.451.450.048.747.446.144.943.742.641.540.439.338.337.341.551.650.248.947.646.445.144.042.841.740.639.538.537.441.651.850.549.147.846.645.444.243.041.940.839.738.637.641.752.150.749.448.146.845.644.439.938.837.841.852.350.949.648.347.045.844.643.439.038.041.952.651.249.848.547.246.044.843.642.441.342.052.851.450.048.747.446.245.043.842.641.540.439.438.342.153.051.650.349.047.746.445.244.042.841.740.639.538.542.253.351.950.549.247.946.645.444.243.041.940.839.738.742.353.552.150.749.448.146.845.644.439.938.842.453.852.351.049.648.347.045.844.643.442.342.554.052.651.249.948.547.346.044.843.642.541.340.339.242.654.352.851.450.148.847.546.245.043.842.741.540.439.442.754.553.151.750.349.047.746.445.244.042.941.740.639.642.854.753.351.950.549.247.946.645.444.243.041.940.839.742.955.053.552.150.849.448.146.845.644.439.943.055.253.852.451.049.648.347.145.844.643.442.341.240.1测区混凝土强度换算值f(MPa)测区平均碳化深度值dm(mm)43.155.554.052.651.249.948.647.346.044.843.642.541.440.343.255.754.352.851.450.148.847.546.245.043.842.741.540.543.356.054.553.151.750.349.047.746.445.244.042.941.740.643.456.254.853.351.950.549.247.946.645.440.843.556.555.053.552.150.849.448.146.945.644.443.656.755.253.852.451.049.648.347.145.844.643.442.341.243.757.055.554.052.651.249.948.547.346.044.843.642.541.443.857.255.754.352.851.450.148.847.546.245.043.842.741.543.957.556.054.553.151.750.349.047.746.445.244.042.941.744.057.756.254.753.351.950.549.247.946.645.444.243.041.944.158.056.555.053.552.150.749.448.146.845.644.458.256.755.253.852.351.049.648.347.045.844.643.442.344.358.557.055.554.052.651.249.848.547.246.044.843.642.544.458.857.255.754.252.851.450.148.747.546.245.043.842.644.559.057.555.954.553.051.650.348.947.746.445.244.042.844.659.357.756.254.753.351.950.549.247.946.645.444.243.044.759.558.056.454.953.552.150.749.448.146.845.644.443.244.859.858.256.755.253.752.350.949.648.347.045.844.643.444.9—58.556.955.454.052.551.149.848.547.246.044.843.645.0—58.757.255.654.252.851.450.048.747.446.244.943.8测区混凝土强度换算值f(MPa)测区平均碳化深度值dm(mm)45.1 59.057.455.954.453.051.650.248.947.646.445.143.945.2 59.257.656.154.653.251.850.449.147.846.645.344.145.3—59.557.956.454.953.452.050.749.348.046.845.544.345.4—59.758.156.655.153.752.250.949.548.247.045.744.545.5——58.456.855.353.952.551.149.748.447.245.944.745.6 58.657.155.654.152.751.349.948.647.446.144.945.7 58.957.355.854.352.951.550.248.847.646.345.145.8——59.157.656.154.653.151.750.449.047.846.545.345.9——59.457.856.354.853.452.050.649.348.046.745.546.0——59.658.156.555.053.652.250.849.548.246.945.646.1 59.958.356.855.353.852.451.049.748.447.145.846.2 58.557.055.554.052.651.249.948.647.346.046.3———58.857.255.754.352.851.450.148.847.546.246.4———59.057.556.054.553.051.750.349.047.746.446.5———59.357.756.254.753.351.950.549.247.946.646.6 59.558.056.454.953.552.150.749.448.146.846.7 59.858.256.755.253.752.350.949.648.347.046.8————58.456.955.453.952.551.149.848.547.246.9————58.757.155.654.252.751.350.048.747.447.0————58.957.455.854.452.951.550.248.947.6测区混凝土强度换算值f(MPa)测区平均碳化深度值dm(mm)47.1 59.257.656.154.653.251.850.449.147.847.2 59.457.856.354.853.452.050.649.348.047.3————59.658.156.555.053.652.250.849.548.247.4————59.958.356.855.353.852.451.049.748.447.5—————58.557.055.554.052.651.249.948.647.6 58.857.255.754.352.851.450.148.847.7 59.057.555.954.553.051.650.349.047.8—————59.357.756.254.753.351.850.549.247.9—————59.557.956.454.953.552.150.749.348.0—————59.758.256.655.153.752.350.949.548.1 58.456.955.453.952.551.149.748.2 58.657.155.654.152.751.349.948.3——————58.957.355.854.352.951.550.148.4——————59.157.556.054.553.151.750.348.5——————59.357.856.254.853.351.950.548.6 59.658.056.555.053.552.150.748.7 59.858.256.755.253.752.350.948.8———————58.556.955.454.052.551.148.9———————58.757.155.654.252.751.449.0———————58.957.455.954.452.951.6测区混凝土强度换算值f(MPa)测区平均碳化深度值dm(mm)49.1 59.257.656.154.653.251.849.2 59.457.856.354.853.452.049.3———————59.658.056.555.053.652.249.4———————59.858.356.755.253.852.449.5————————58.557.055.554.052.649.6 58.757.255.754.252.849.7 59.057.455.954.453.049.8————————59.257.656.154.653.249.9————————59.457.856.354.853.450.0————————59.658.156.555.053.650.1 59.958.356.855.353.850.2 58.557.055.554.050.3—————————58.757.255.754.250.4—————————59.057.455.954.450.5—————————59.257.656.154.650.6 59.457.956.354.850.7 59.658.156.555.150.8—————————59.958.356.855.350.9——————————58.557.055.551.0——————————58.757.255.7测区混凝土强度换算值f(MPa)测区平均碳化深度值dm(mm)51.1 59.057.455.951.2 59.257.656.151.3——————————59.457.856.351.4——————————59.658.156.551.5——————————59.858.356.751.6 58.556.951.7 58.757.251.8———————————58.957.451.9———————————59.157.652.0———————————59.457.852.1 59.658.052.2———————————59.858.252.3————————————58.452.4————————————58.752.5————————————58.952.6————————————59.152.7————————————59.352.8————————————59.552.9————————————59.753.0—————————————注:表中未注明(即“—”)的测区混凝土强度换算值为:<15.0MPa或≥60.0MPa。Rα检测角度90°60°45°30°-30°-45°-60°-90°20-6.0-5.0-4.0-3.0+2.5+3.0+3.5+4.021-5.9-4.9-4.0-3.0+2.5+3.0+3.5+4.022-5.8-4.8-3.9-2.9+2.4+2.9+3.4+3.923-5.7-4.7-3.9-2.9+2.4+2.9+3.4+3.924-5.6-4.6-3.8-2.8+2.3+2.8+3.3+3.825-5.5-4.5-3.8-2.8+2.3+2.8+3.3+3.826-5.4-4.4-3.7-2.7+2.2+2.7+3.2+3.727-5.3-4.3-3.7-2.7+2.2+2.7+3.2+3.728-5.2-4.2-3.6-2.6+2.1+2.6+3.1+3.629-5.1-4.1-3.6-2.6+2.1+2.6+3.1+3.630-5.0-4.0-3.5-2.5+2.0+2.5+3.0+3.531-4.9-4.0-3.5-2.5+2.0+2.5+3.0+3.532-4.8-3.9-3.4-2.4+1.9+2.4+2.9+3.433-4.7-3.9-3.4-2.4+1.9+2.4+2.9+3.434-4.6-3.8-3.3-2.3+1.8+2.3+2.8+3.335-4.5-3.8-3.3-2.3+1.8+2.3+2.8+3.336-4.4-3.7-3.2-2.2+1.7+2.2+2.7+3.237-4.3-3.7-3.2-2.2+1.7+2.2+2.7+3.238-4.2-3.6-3.1-2.1+1.6+2.1+2.6+3.139-4.1-3.6-3.1-2.1+1.6+2.1+2.6+3.1Rα检测角度90°60°45°30°-30°-45°-60°-90°40-4.0-3.5-3.0-2.0+1.5+2.0+2.5+3.041-4.0-3.5-3.0-2.0+1.5+2.0+2.5+3.042-3.9-3.4-2.9-1.9+1.4+1.9+2.4+2.943-3.9-3.4-2.9-1.9+1.4+1.9+2.4+2.944-3.8-3.3-2.8-1.8+1.3+1.8+2.3+2.845-3.8-3.3-2.8-1.8+1.3+1.8+2.3+2.846-3.7-3.2-2.7-1.7+1.2+1.7+2.2+2.747-3.7-3.2-2.7-1.7+1.2+1.7+2.2+2.748-3.6-3.1-2.6-1.6+1.1+1.6+2.1+2.649-3.6-3.1-2.6-1.6+1.1+1.6+2.1+2.650-3.5-3.0-2.5-1.5+1.0+1.5+2.0+2.5检测构件数测区数最小值(MPa)平均值(MPa)标准差(MPa)抗压强度推定值(MPa)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:测区编号回弹值碳化深度读数(mm)碳化深度平均值(mm)2#3#测区1测区2测区3…测区10…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: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:3)表示允许稍有选择,在条件许可时首先应这样做的:正面词采用“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《建筑结构检测技术标准》GB/T503442《回弹仪》GB/T91383《回弹法检测混凝土抗压强度技术规程》JGJ/T234《钻芯法检测混凝土强度技术规程》JGJ/T3845国家计量检定规程《回弹仪》JJG8176《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技术规程《回弹法检测泵送混凝土抗压强度技术规程》DBJ/T15-211-2021,经广东省住房和城乡建设厅本规程在制订过程中,编制组通过广泛调研,在国内外相关标准和工程实践经验基础上,进行了采集、整理、计算、分析等工作,建立了混凝土抗压强度≥15.0MPa且<60.0MPa的地区测强曲线。通过省内广州、佛山、深圳、中山、珠海、江检测数据对该测强曲线的验证,结果与测强曲线的符合性好,表明该测强曲线科学可靠,为国家行业编制组结合广东省的实际情况,通过大量的试且<60.0MPa的地区测强曲线,参考了国内外相关现行行业技术规程、先进技术标准,并以多种方式广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,对条文规定的目的、依据以及执行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 54 593.1技术要求 593.2检定和率定 613.3保养 634检测技术 664.1一般规定 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 78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凝土,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,例如混凝土轨枕,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,使混凝土表面干燥后再进行检测。粗骨料最大公称粒径大于31.5mm时,已超出制定本规程测强曲线时所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回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<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,对于临界条件下混凝土设计强度等级小于C60,且现场预留混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,混凝土实际强度在型回弹仪对部分构件分别进行预估检测,根据预估1当两种回弹仪的检测结果都小于60.0MPa1.0.3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》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土标准养护试件的要求。因此,按本规程检测所推定的混凝土抗压强度,不能等同于施工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1同条件养护立方体试件的试验结果不能满足2标准养护试件强度缺乏代表性或试件数量不3对混凝土标准养护试件强度的检验结果有怀4由于管理不善、施工质量不良,导致试件与1.0.4凡本规程涉及的其他有关方面,例如钻芯取样,高空、深坑作业时的安全技术和劳动保护等,3.1.1随着光电子技术在回弹仪上的应用,国内数字式回弹仪的技术水平有了很大的提高,技术上已经成熟,我国一些回弹仪企业生产的数字回弹仪性能已相当稳定。为了推广和应用先进技术,提高工作效率,减少人为产生的读数、记录、计算等过程出现差错,因此,本条规定可使用数字式回弹仪也3.1.2由于回弹仪为计量仪器,因此在明显的位置号及生产日期。回弹仪属于量具,在使用之前,应3.1.3回弹仪的质量及测试性能直接影响混凝土强度推定结果的准确性。回弹仪的标准状态是统一仪器性能的基础,是使回弹法广泛应用于现场的关键所在;只有采用质量统一,性能一致的回弹仪,才能保证测试结果的可靠性,并能在同一水平上进行能量E,即回弹仪弹击拉簧恢复原始状态所作的功×784.532×0.0752=2.207J标称能量为2.207J回弹仪的率定所用钢砧质量作用是:检验回弹仪的标准能量是否为2.207J;回弹仪的测试性能是否稳定;机芯的滑动部分是否有凝土立方体试块上的回弹值予以修正,更不允许旋转尾盖调零螺丝人为地使其达到率定值。此时,可按本规程第3.3节要求进行常规保养,若保养仍不现有绝大多数数字式回弹仪都是在传统机械构造和标准技术参数的基础上实现回弹值的数字化采样的,即现有数字式回弹仪所得到的回弹值采样系统都是把回弹仪的指针示值实现数字化采样。也只有这种形式的数字回弹仪才符合现行回弹法技术规程的使用要求。保留人工直读示值系统能使数字回弹仪的操作者在实际检测过程中随时核对数字回弹仪所显示的采样值是否与指针示值相同,及时发现仪器采样系统的故障。因此,规定数字式回弹仪应带有指针直读系统,这是保证数字式回弹仪的数字3.2.1本条指出,检定混凝土回弹仪的单位应为有新出厂的回弹仪,由于在生产过程中的质量控制水平不同,而且贮存运输过程会对回弹仪产生一定影响,为保证回弹仪启用时处于标准状态,因此回弹仪的检定期限为6个月,并未区分回弹仪的类回弹仪经常规保养后,钢砧率定值仍不符合要求,表明回弹仪已偏离标准状态,应进行检定。经保养后率定值不合格的回弹仪如果不送检定,需送更换主要零件或检修后,回弹仪的整体性能会遭受严重撞击或其它损害的回弹仪,无法采用3.2.2本条汇总整理了回弹仪需进行率定的要求。为了保证在使用中及时发现和纠正回弹仪的非标准状态,每个检测项目,或者每天在使用回弹仪进行3.2.3本条参照现行国家计量检定规程《回弹仪》标准关于率定的规定中给出的钢砧率定值的解读。回弹仪四个方向的率定值,是指弹击杆分别在0°3.2.4钢砧的钢芯强度和表面状态会随着弹击次数3.3.2本条给出了回弹仪常规保养的步骤。进行常规保养时,必须先使弹击锤脱钩后再取出机芯,否则会使弹击杆突然伸出造成伤害。取机芯时要将指针轴向上轻轻抽出,以免造成指针片折断。数字式回弹仪结构和原理较复杂,其厂商已提供了使用和维护手册,应按该手册的要求进行维护和保养。需要注意的是,维护保养的人员必须是对回弹仪工作3.3.3本条给出了回弹仪常规保养的特别注意事项。各零部件清洗完后,不能在指针轴上抹油;否则,使用中由于指针轴的污垢,将使指针摩擦力变化,直接影响了检测结果。由于回弹仪的使用环境中,粉尘含量较高,加之仪器内各相互移动的部件3.3.4、3.3.5回弹仪每次使用完毕后,应及时清除表面污垢。不用时,应将弹击杆压入仪器内,必须经弹击后方可按下按钮锁住机芯,如果未经弹击而锁住机芯,将使弹击拉簧在不工作时仍处于受拉状态,极易因疲劳而损坏。存放时回弹仪应平放在干燥阴凉处,如存放地点潮湿将会使仪器锈蚀。数字回弹仪内的电池长期不用,电池内的电解质易发生4检测技术4.1.1若不进行专门的技术培训,则会对同一构件混凝土强度的检测结果存在因人而异的混乱现象,本条规定凡从事本项检测的人员应经过专业培训。构件有全面、系统的了解。此处,必须了解水泥的安定性,如水泥安定性不合格则不能检测,如不能确切了解水泥安定性合格与否应在检测报告上说明,以免产生由于后期混凝土强度因水泥安定性不合格而降低或丧失所引起事故责任不清的问题。另外,了解清楚混凝土浇筑日期是为了推算检测时构件混凝土的龄期,了解混凝土施工工艺等是为了确认混凝土适用本规程检测,也可为分析处理构件混4.1.3按单个构件或按批抽样进行检测,是采用回弹法对混凝土结构进行强度推定的两种常见形式。个;将某一方向尺寸不大

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