WO2020168800A1 - 一种关于荷载箱后注浆抗压强度评定的检测装置及检测方法 - Google Patents
一种关于荷载箱后注浆抗压强度评定的检测装置及检测方法 Download PDFInfo
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D33/00—Testing foundations or foundation structures
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- the invention belongs to the technical field of construction engineering material quality detection devices, and specifically relates to a detection device and a detection method for evaluating the compressive strength of grouting after a load box.
- the purpose of the present invention is to provide a detection device and a detection method for evaluating the compressive strength of post-grouting of the load box, which can better improve the compression resistance of the currently widely used reserved concrete standard curing specimens and specimens cured under the same conditions.
- Strength detection and evaluation of the deviation caused by the actual compressive strength of cast-in-place concrete components provides a reliable basis for the detection and evaluation of grouting compressive strength of foundation piles after self-balance test in the industry.
- a detection device for evaluating the compressive strength of the post-load box grouting comprising a post-load box grouting equipment, a grouting pipeline, a grouting return pipeline and a grouting load box;
- the grout output port of the grouting equipment behind the load box is connected to the grouting load box through the grouting pipeline;
- the grouting pipeline is connected with the grouting load box.
- the diameter of the grouting pipeline is DN25, and the diameter of the grouting pipeline is DN6 or DN8; the grouting pipeline and the grouting pipeline are fastened by screw connections and are sealed with seals.
- the grouting pipeline and the grout return pipeline are made of high-pressure steel wire braided hoses, and the hose joints of the grouting pipeline and the grout return pipeline adopt a crimping type.
- the maximum working pressure of the inlet pipe is not less than 60MPa, and the maximum working pressure of the grouting pipe is not less than 35MPa, which should meet the requirements of JB/T8727-2004 and GB/T9065.5-2010.
- the high-pressure steel wire braided rubber hose has a two-layer or three-layer steel wire winding structure.
- the cylindrical specimen taken out of the cylinder of the jack shall be made into a specification of ⁇ 100x100mm as required, and the upper and lower ends of the specimen shall be ground flat and the perpendicularity to the outer circle shall be ⁇ 0.1mm.
- the detection device uses water or air as the working medium.
- the post-load box grouting test was carried out by simulating working conditions, and the target cylindrical specimen was prepared after molding.
- the number of target test specimens from the same batch of grouting fluid test specimens is not less than 2 groups, each group of target specimens is 3, and the obtained target specimens’ compressive strength should be tested in the following two ways as required: Compressive strength test of the target specimen under constrained conditions (that is, the target specimen is in the cylinder of the grouting load box jack) and the compressive strength test of the target specimen under constraint conditions (take the specimen out of the cylinder of the grouting load box jack) .
- a detection method for a detection device for evaluating the compressive strength of grouting after a load box includes the following steps:
- test piece taken out of the cylinder of the jack is made into a cylindrical test piece, and the upper and lower end surfaces of the test piece are ground flat and the perpendicularity to the outer circle is ⁇ 0.1mm;
- step 2) is under test under the constraint conditions:
- the specification of the cylindrical specimen is ⁇ 100x100mm, and its height-diameter ratio is 1.
- each group of target specimens under constraint conditions and the failure load value of each group of target specimens under constraint conditions are measured by a compression testing machine.
- the following calculation and analysis methods are used to evaluate the and Break the compressive strength index of the target specimen under the constraint condition;
- fcu compression strength of target cylinder specimen (Mpa);
- A The pressure bearing area of the test piece (mm 2 );
- ⁇ is the empirical conversion coefficient between the strength of the ⁇ 100x100mm concrete cylindrical specimen and the standard cube specimen, and 1.0 is here;
- the compressive strength calculation of concrete specimens should be accurate to 0.1Mpa;
- the device of the present invention is simple, convenient to operate, safe and practical.
- the target cylindrical specimen required for subsequent testing can be quickly and conveniently obtained.
- the detection method of the present invention can realize simple, rapid and accurate determination of the compressive strength of the test piece.
- the compressive strength of the concrete specimens obtained by the present invention can reflect the performance of cast-in-place concrete members more objectively and truly, thereby providing a reliable basis for the inspection and evaluation of the grouting compressive strength of foundation piles in the industry after self-balance testing.
- Figure 1 is a schematic diagram of the structure of the detection device of the present invention.
- This embodiment is a detection device for evaluating the compressive strength of post-load box grouting.
- the detection device includes post-load box grouting equipment 1, grouting pipeline 2, grouting return pipeline 3, and grouting load box 4;
- the grout outlet of the grouting equipment 1 behind the load box is connected to the grouting load box 4 through the grouting pipeline 2;
- the grouting pipeline 3 is connected with the grouting load box 4.
- the diameter of the grouting pipeline 2 is DN25, and the diameter of the grouting pipeline 3 is DN6 or DN8; the grouting pipeline 2 and the grouting pipeline 3 are fastened by screw connections and equipped with seals.
- the grouting pipeline 2 and the grouting pipeline 3 are made of high-pressure steel wire braided hoses, and the hose joints of the grouting pipeline 2 and the grouting pipeline 3 adopt a crimping type.
- the maximum working pressure of the inlet pipe is not less than 60MPa, and the maximum working pressure of the grouting pipe is not less than 35MPa, which should meet the requirements of JB/T8727-2004 and GB/T9065.5-2010.
- the high-pressure steel wire braided hose is a two-layer or three-layer steel wire winding structure.
- the cylindrical specimen taken out of the cylinder of the jack shall be made into a specification of ⁇ 100x100mm as required, and the upper and lower ends of the specimen shall be ground flat and the perpendicularity to the outer circle shall be ⁇ 0.1mm.
- the detection device uses water or air as the working medium.
- the post-load box grouting test was carried out by simulating working conditions, and the target cylindrical specimen was prepared after molding.
- the number of target test specimens from the same batch of grouting fluid test specimens is not less than 2 groups, each group of target specimens is 3, and the obtained target specimens’ compressive strength should be tested in the following two ways as required: Compressive strength test of the target specimen under constrained conditions (that is, the target specimen is in the cylinder of the grouting load box jack) and the compressive strength test of the target specimen under constraint conditions (take the specimen out of the cylinder of the grouting load box jack) .
- This embodiment is a detection method for a detection device for evaluating the compressive strength of post-grouting after the load box.
- the detection method includes the following steps:
- test piece taken out of the cylinder of the jack is made into a cylindrical test piece, and the upper and lower end surfaces of the test piece are ground flat and the perpendicularity to the outer circle is ⁇ 0.1mm;
- the specification of the cylindrical specimen is ⁇ 100x100mm, and its height-diameter ratio is 1.
- the ultimate load of each group of target specimens under constrained conditions and the failure load value of each group of target specimens under constrained conditions are measured by a compression testing machine.
- the following calculation and analysis methods are used to evaluate the constrained conditions and the breaking conditions of constraints. Compressive strength index of the next target specimen;
- fcu compression strength of target cylinder specimen (Mpa);
- A The pressure bearing area of the test piece (mm 2 );
- ⁇ is the empirical conversion coefficient between the strength of the ⁇ 100x100mm concrete cylindrical specimen and the standard cube specimen, and 1.0 is here;
- the compressive strength calculation of concrete specimens should be accurate to 0.1Mpa;
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Abstract
本发明属于建筑工程材料质量检测装置技术领域，具体涉及一种关于荷载箱后注浆抗压强度评定的检测装置及其检测方法。检测装置包括荷载箱后注浆设备、注浆管路、回浆管路和注浆荷载箱；荷载箱后注浆设备的浆液输出口通过注浆管路与注浆荷载箱连接；回浆管路与注浆荷载箱连接。本发明装置简单、操作方便，安全性好，实用性强。通过本发明装置，可快速方便的获得后续测试所需的目标圆柱体试件。本发明检测方法可实现对待测试件抗压强度的简便、快速、准确测定。通过本发明获得的混凝土试件，其抗压强度可较客观真实地反映现浇混凝土构件的性能，从而为行业内基桩自平衡测试后注浆抗压强度检测评定提供可靠的依据。
Description
本发明属于建筑工程材料质量检测装置技术领域，具体涉及一种关于荷载箱后注浆抗压强度评定的检测装置及其检测方法。
如今，基桩自平衡静载试验技术已成为目前桩基检测中应用最广的承载力测试方法，然而在进行自平衡静载试验时，荷载箱打开后会在其内部产生不可预见的空隙断层，造成断桩，影响试桩用于工程桩的质量，造成质量隐患，因此需要进行自平衡静载试验后注浆作业，将水泥浆液注入填充到荷载箱打开后形成的空隙断层处，以消除测试后的断桩现象，有效连接荷载箱上下两段桩，确保桩基桩身强度及桩身完整性。然而，在后注浆作业完成后，如何对上述空隙断层处荷载箱缸体内填充置换形成的混凝土试件的抗压强度进行检测评定，行业内至今还缺乏一种行之有效的方法。
我国混凝土抗压强度检测通常是以标准养护试件的抗压强度为依据进行测定的。但必须注意，混凝土标养试件的抗压试验对结构混凝土来说，只是一种间接测定值。由于试件的成型条件、养护条件和受力状态都不可能和实体结构物上的混凝土完全一致，因此，试件测量值只能认为是混凝土在特定条件下的性能反映，其抗压强度不可能真实反映结构混凝土的性能。
发明内容
本发明的目的在于提供一种关于荷载箱后注浆抗压强度评定的检测装置及检测方法，可较好地改进目前广泛采用的预留混凝土标准养护试件和同条件养护试件的抗压强度检测评定现浇混凝土构件实际抗压强度所造成的偏差，为行业内基桩自平衡测试后注浆抗压强度检测评定提供可靠的依据。
本发明为了实现上述目的，采用如下技术方案：
一种关于荷载箱后注浆抗压强度评定的检测装置，该检测装置包括荷载箱后注浆设备、注浆管路、回浆管路和注浆荷载箱；
荷载箱后注浆设备的浆液输出口通过注浆管路与注浆荷载箱连接；
回浆管路与注浆荷载箱连接。
进一步的，注浆管路的通径为DN25，回浆管路的通径为DN6或DN8；注浆管路和回浆管路采用螺纹连接紧固并且配有密封件密封。
进一步的，注浆管路和回浆管路为高压钢丝编织胶管制成，并且注浆管路和回浆管路的软管接头采用扣压式。且进液管最大工作压力不小于60MPa，注浆管最大工作压力不小于35MPa，应符合JB/T8727-2004和GB/T9065.5-2010的规定。
进一步的，高压钢丝编织胶管为两层或三层钢丝缠绕结构。
破除约束条件下进行试件抗压强度测试前，应按要求将千斤顶缸体内取出的圆柱体试件制成规格Φ100x100mm，试件上下端面磨平处理并与外圆垂直度≤0.1mm。
本检测装置采用水或空气作工作介质。
通过模拟工况进行荷载箱后注浆试验，成型后制取目标圆柱体试件。同批次注浆液试件制取目标试件组数不少于2组，每组目标试件为3个，且获得的目标试件抗压强度均应按要求进行以下两种方式检测：带约束条件下(即目标试件处于注浆荷载箱千斤顶缸体内)目标试件抗压强度测试和破除约束条件下(将试件从注浆荷载箱千斤顶缸体内取出)抗压强度测试。
一种关于荷载箱后注浆抗压强度评定的检测装置的检测方法，该检测方法包括如下步骤：
用电液式压力试验机对目标圆柱体试件进行抗压强度测试；
1)带约束条件下测试
(1)先将带约束试件表面擦拭干净，测量尺寸，并检查其外观；尺寸测量精确至1毫米，并据此计算带约束试件的承压面积；
(2)将带约束试件安放在压力试验机的下压板上，试件的承压面与成型时的顶面垂直；试件的中心应与试验机下压板中心对准；
(3)开动试验机，当上压板与试件接近，调整球座，使接触均衡；测试时应连续而均匀地加荷，加荷速度为：
当混凝土强度等级<C30时，取0.3-0.5MPa/s；
当混凝土强度等级介于C30和C60之间时，取0.5-0.8MPa/s；当混凝土强度等级≥C60时，取0.8-1.0MPa/s；
(4)当加荷至带约束试件沉降量达到60～80mm，且荷载大于同类型混凝土抗压强度指标时，停止试验机油门，加荷结束，记录此时的荷载值；
2)破除约束条件下测试
测试前将千斤顶缸体内取出的试件制成圆柱体试件，试件上下端面磨平处理并与外圆垂直度≤0.1mm；
(1)先将待测试件表面擦拭干净，复核尺寸，并检查其外观；尺寸测量精确至1毫米，并据此计算试件的承压面积；
(2)将待测试件安放在压力试验机的下压板上，试件的承压面与成型时的顶面垂直；试件的中心应与试验机下压板中心对准；
(3)开动试验机，当上压板与试件接近，调整球座，使接触均衡。测试时应连续而均匀地加荷，加荷速度为：
当混凝土强度等级<C30时，取0.3-0.5MPa/s；
当混凝土强度等级介于C30和C60之间时，取0.5-0.8MPa/s；
当混凝土强度等级≥C60时，取0.8-1.0MPa/s；
(4)当加荷至试件接近破坏而开始迅速变形时，停止调整试验机油门，直至试件破坏；记录此时的破坏荷载值。
进一步的，步骤2)破除约束条件下测试中：
圆柱体试件的规格为Φ100x100mm，并且其高径比为1。
进一步的，通过压力试验机分别测得带约束条件下各组目标试件的极限荷载和破除约束条件下各组目标试件的破坏荷载数值，采用如下计算分析方法，分别评定带约束条件下和破除约束条件下目标试件的抗压强度指标；
1)目标圆柱体试件抗压强度计算公式：fcu＝α·F/A
式中：fcu——目标圆柱体试件抗压强度(Mpa)；
α——转换系数；
F——极限荷载/破坏荷载(N)；
A——试件承压面积(mm
2)；
α为Φ100x100mm混凝土圆柱体试件和标准立方体试件强度的经验转换系数，此处取1.0；
混凝土试件抗压强度计算应精确至0.1Mpa；
2)每组3个试件均在荷载箱后注浆试验地点制作、成型、取样，按如下方法确定该组试件的混凝土抗压强度代表值：
(1)以三个试件测值的算术平均值作为该组试件的抗压强度值；
(2)三个测值中的最大或最小值，如有一个与中间值的差超过中间值的15％，则把最大及最小值一并舍除，取中间值作为该组试件的抗压强度值；
(3)三个测值中的最大或最小值如有两个测值与中间值的差超过中间值的15％，则该组试件的试验数据无效。
本发明具有以下有益效果：
1、本发明装置简单、操作方便，安全性好，实用性强。
2、通过本发明装置，可快速方便的获得后续测试所需的目标圆柱体试件。
3、本发明检测方法可实现对待测试件抗压强度的简便、快速、准确测定。
4、通过本发明获得的混凝土试件，其抗压强度可较客观真实地反映现浇混凝土构件的性能，从而为行业内基桩自平衡测试后注浆抗压强度检测评定提供可靠的依据。
图1为本发明检测装置的结构示意图。
下面结合附图对本发明进行详细描述：
实施例1
本实施例为一种关于荷载箱后注浆抗压强度评定的检测装置，该检测装置包括荷载箱后注浆设备1、注浆管路2、回浆管路3和注浆荷载箱4；
荷载箱后注浆设备1的浆液输出口通过注浆管路2与注浆荷载箱4连接；
回浆管路3与注浆荷载箱4连接。
注浆管路2的通径为DN25，回浆管路3的通径为DN6或DN8；注浆管路2和回浆管路3采用螺纹连接紧固并且配有密封件密封。
注浆管路2和回浆管路3为高压钢丝编织胶管制成，并且注浆管路2和回浆管路3的软管接头采用扣压式。进液管最大工作压力不小于60MPa，注浆管最大工作压力不小于35MPa，应符合JB/T8727-2004和GB/T9065.5-2010的规定。
高压钢丝编织胶管为两层或三层钢丝缠绕结构。
破除约束条件下进行试件抗压强度测试前，应按要求将千斤顶缸体内取出的圆柱体试件制成规格Φ100x100mm，试件上下端面磨平处理并与外圆垂直度≤0.1mm。
本检测装置采用水或空气作工作介质。
通过模拟工况进行荷载箱后注浆试验，成型后制取目标圆柱体试件。同批次注浆液试件制取目标试件组数不少于2组，每组目标试件为3个，且获得的目标试件抗压强度均应按要求进行以下两种方式检测：带约束条件下(即目标试件处于注浆荷载箱千斤顶缸体内)目标试件抗压强度测试和破除约束条件下(将试件从注浆荷载箱千斤顶缸体内取出)抗压强度测试。
实施例2
本实施例为一种关于荷载箱后注浆抗压强度评定的检测装置的检测方法。
该检测方法包括如下步骤：
用电液式压力试验机对目标圆柱体试件进行抗压强度测试；
1)带约束条件下测试
(1)先将带约束试件表面擦拭干净，测量尺寸，并检查其外观；尺寸测量精确至1毫米，并据此计算带约束试件的承压面积；
(2)将带约束试件安放在压力试验机的下压板上，试件的承压面与成型时的顶面垂直；试件的中心应与试验机下压板中心对准；
(3)开动试验机，当上压板与试件接近，调整球座，使接触均衡；测试时应连续而均匀地加荷，加荷速度为：
当混凝土强度等级<C30时，取0.3-0.5MPa/s；
当混凝土强度等级介于C30和C60之间时，取0.5-0.8MPa/s；当混凝土强度等级≥C60时，取0.8-1.0MPa/s；
(4)当加荷至带约束试件沉降量达到60～80mm，且荷载大于同类型混凝土抗压强度指标时，停止试验机油门，加荷结束，记录此时的荷载值；
2)破除约束条件下测试
测试前将千斤顶缸体内取出的试件制成圆柱体试件，试件上下端面磨平处理并与外圆垂直度≤0.1mm；
(1)先将待测试件表面擦拭干净，复核尺寸，并检查其外观；尺寸测量精确至1毫米，并据此计算试件的承压面积；
(2)将待测试件安放在压力试验机的下压板上，试件的承压面与成型时的顶面垂直；试件的中心应与试验机下压板中心对准；
(3)开动试验机，当上压板与试件接近，调整球座，使接触均衡。测试时应连续而均匀地加荷，加荷速度为：
当混凝土强度等级<C30时，取0.3-0.5MPa/s；
当混凝土强度等级介于C30和C60之间时，取0.5-0.8MPa/s；
当混凝土强度等级≥C60时，取0.8-1.0MPa/s；
(4)当加荷至试件接近破坏而开始迅速变形时，停止调整试验机油门，直至试件破坏；记录此时的破坏荷载值。
步骤2)破除约束条件下测试中：
圆柱体试件的规格为Φ100x100mm，并且其高径比为1。
通过压力试验机分别测得带约束条件下各组目标试件的极限荷载和破除约束条件下各组目标试件的破坏荷载数值，采用如下计算分析方法，分别评定带约束条件下和破除约束条件下目标试件的抗压强度指标；
2)目标圆柱体试件抗压强度计算公式：fcu＝α·F/A
式中：fcu——目标圆柱体试件抗压强度(Mpa)；
α——转换系数；
F——极限荷载/破坏荷载(N)；
A——试件承压面积(mm
2)；
α为Φ100x100mm混凝土圆柱体试件和标准立方体试件强度的经验转换系数，此处取1.0；
混凝土试件抗压强度计算应精确至0.1Mpa；
2)每组3个试件均在荷载箱后注浆试验地点制作、成型、取样，按如下方法确定该组试件的混凝土抗压强度代表值：
(1)以三个试件测值的算术平均值作为该组试件的抗压强度值；
(2)三个测值中的最大或最小值，如有一个与中间值的差超过中间值的15％，则把最大及最小值一并舍除，取中间值作为该组试件的抗压强度值；
(3)三个测值中的最大或最小值如有两个测值与中间值的差超过中间值的15％，则该组试件的试验数据无效。
以上所述，仅为本发明较佳的具体实施方式，但本发明的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本发明揭露的技术范围内，根据本发明的技术方案及其发明构思加以等同替换或改变，都应涵盖在本发明的保护范围之内。
Claims (7)
- 一种关于荷载箱后注浆抗压强度评定的检测装置，其特征在于：该检测装置包括荷载箱后注浆设备(1)、注浆管路(2)、回浆管路(3)和注浆荷载箱(4)；荷载箱后注浆设备(1)的浆液输出口通过注浆管路(2)与注浆荷载箱(4)连接；回浆管路(3)与注浆荷载箱(4)连接。
- 根据权利要求1所述的关于荷载箱后注浆抗压强度评定的检测装置，其特征在于：注浆管路(2)的通径为DN25，回浆管路(3)的通径为DN6或DN8；注浆管路(2)和回浆管路(3)采用螺纹连接紧固并且配有密封件密封。
- 根据权利要求1所述的关于荷载箱后注浆抗压强度评定的检测装置，其特征在于：注浆管路(2)和回浆管路(3)为高压钢丝编织胶管制成，并且注浆管路(2)和回浆管路(3)的软管接头采用扣压式。
- 根据权利要求1所述的关于荷载箱后注浆抗压强度评定的检测装置，其特征在于：高压钢丝编织胶管为两层或三层钢丝缠绕结构。
- 一种如权利要求1-4所述的关于荷载箱后注浆抗压强度评定的检测装置的检测方法，其特征在于该检测方法包括如下步骤：用电液式压力试验机对目标圆柱体试件进行抗压强度测试；1)带约束条件下测试(1)先将带约束试件表面擦拭干净，测量尺寸，并检查其外观；尺寸测量精确至1毫米，并据此计算带约束试件的承压面积；(2)将带约束试件安放在压力试验机的下压板上，试件的承压面与成型时的顶面垂直；试件的中心应与试验机下压板中心对准；(3)开动试验机，当上压板与试件接近，调整球座，使接触均衡；测试时应连续而均匀地加荷，加荷速度为：当混凝土强度等级<C30时，取0.3-0.5MPa/s；当混凝土强度等级介于C30和C60之间时，取0.5-0.8MPa/s；当混凝土强度等级≥C60时，取0.8-1.0MPa/s；(4)当加荷至带约束试件沉降量达到60～80mm，且荷载大于同类型混凝土抗压强度指标时，停止试验机油门，加荷结束，记录此时的荷载值；2)破除约束条件下测试测试前将千斤顶缸体内取出的试件制成圆柱体试件，试件上下端面磨平处理并与外圆垂直度≤0.1mm；(1)先将待测试件表面擦拭干净，复核尺寸，并检查其外观；尺寸测量精确至1毫米，并据此计算试件的承压面积；(2)将待测试件安放在压力试验机的下压板上，试件的承压面与成型时的顶面垂直；试件的中心应与试验机下压板中心对准；(3)开动试验机，当上压板与试件接近，调整球座，使接触均衡。测试时应连续而均匀地加荷，加荷速度为：当混凝土强度等级<C30时，取0.3-0.5MPa/s；当混凝土强度等级介于C30和C60之间时，取0.5-0.8MPa/s；当混凝土强度等级≥C60时，取0.8-1.0MPa/s；(4)当加荷至试件接近破坏而开始迅速变形时，停止调整试验机油门，直至试件破坏；记录此时的破坏荷载值。
- 根据权利要求5所述的关于荷载箱后注浆抗压强度评定的检测装置的检测方法，其特征在于：步骤2)破除约束条件下测试中：圆柱体试件的规格为Φ100x100mm，并且其高径比为1。
- 根据权利要求5所述的关于荷载箱后注浆抗压强度评定的检测装置的检测方法，其特征在于：通过压力试验机分别测得带约束条件下各组目标试件的极限荷载和破除约束条件下各组目标试件的破坏荷载数值，采用如下计算分析方法，分别评定带约束条件下和破除约束条件下目标试件的抗压强度指标；3)目标圆柱体试件抗压强度计算公式：fcu＝α·F/A式中：fcu——目标圆柱体试件抗压强度(Mpa)；α——转换系数；F——极限荷载/破坏荷载(N)；A——试件承压面积(mm 2)；α为Φ100x100mm混凝土圆柱体试件和标准立方体试件强度的经验转换系数，此处取1.0；混凝土试件抗压强度计算应精确至0.1Mpa；2)每组3个试件均在荷载箱后注浆试验地点制作、成型、取样，按如下方法确定该组试件的混凝土抗压强度代表值：(1)以三个试件测值的算术平均值作为该组试件的抗压强度值；(2)三个测值中的最大或最小值，如有一个与中间值的差超过中间值的15％，则把最大及最小值一并舍除，取中间值作为该组试件的抗压强度值；(3)三个测值中的最大或最小值如有两个测值与中间值的差超过中间值的15％，则该组试件的试验数据无效。
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