一、数显混凝土回弹仪产品简介：

混凝土回弹仪是用一弹簧驱动弹击锤并通过弹击杆弹击混凝土表面所产生的瞬时弹性变形的恢复力，使弹击锤带动指针弹回并指示出弹回的距离。以回弹值（弹回的距离与冲击前弹击锤与弹击杆的距离之比，按百分比计算）作为混凝土抗压强度相关的指标之一，来推定混凝土的抗压强度。轻便（比同类产品省力2/3）、灵活、价廉、不需电源、易掌握、按钮采用拉伸工艺不易脱落、指针易于调节摩擦力，是适合现场使用的无损检测的仪器。

the product introduction:

The concrete hammer is a resilience of a momentary elastic deformation generated by a spring-driven hammer and hitting the concrete surface by the impact rod, so that the hammer bounces the pointer back and indicates the distance of the rebound. The rebound strength (the ratio of the bounce distance to the distance between the impact hammer and the impact bar before impact, calculated as a percentage) is one of the indicators related to the compressive strength of the concrete to estimate the compressive strength of the concrete. Lightweight (2/3 less labor-saving than similar products), flexible, inexpensive, no power supply, easy to master, the button is not easy to fall off by the stretching process, and the pointer is easy to adjust the friction. It is the first choice for non-destructive testing for field use.

二、数显混凝土回弹仪技术参数：

★冲击功能：2.207J（0.225kgf.m）

★弹击拉簧钢度：785N/cm

★弹击锤冲程：75mm

★指针系统摩擦力：0.5-0.8N

★刚钻率定平均值：80±2

★一台主机可配多个机械头，确保检测工作顺利进行。

★数字直方图双重显示回弹值，更直观

★与PC机连接，可自动生成报告混凝土回弹仪

Second, technical parameters:

★ Impact function: 2.207J (0.225kgf.m)

★ Strike tension spring steel: 785N/cm

★ Hammer stroke: 75mm

★ Pointer system friction: 0.5-0.8N

★ Roughing rate average: 80±2

★ One main unit can be equipped with multiple mechanical heads to ensure smooth inspection.

★ Digital histogram double display rebound value, more intuitive

★Connected to a PC to automatically generate a report concrete rebounder

三、数显混凝土回弹仪操作方法：

★一构件混凝土强度检测可采用两种方式

1，单个检测：

适用于单个结构或构件的检测；

2，批量检测 适用于在相同的生产工艺条件下，混凝土强度等级相同，原材料、成型工 艺、养护条件基本相同且龄期相近的结构或构件。批量检测时，抽检数量不得少于同批构 件总数的 30%且不得少于 10 个。 抽检构件时， 应遵循随即抽取zhong 点部位或有代表型的构件。

Third, the method of use:

★ One component concrete strength can be detected in two ways

1, single test:

Suitable for the detection of individual structures or components;

2, batch inspection Applicable to the same production process conditions, the same strength grade of concrete, raw materials, molding process, curing conditions are basically the same and similar age structure or components. In batch inspection, the number of random inspections shall not be less than 30% and not less than 10 of the total number of components in the same batch. When sampling components, follow the key points or representative components.

★二构件的测区符合下列规定

（1）每一结构或构件的测区数不应少于 10 个，对于某一方向尺寸小于 4.5m 且另一方向小 于 0.3m 的构件，其测区数量可适当减少，但不应少于 5 个；

（2）相邻两测区的间距应a大不超过 2m，测区离构件端部或施工缝边缘的距离不大于 0.5m，且不小于 0.2m；

（3）测区应尽量选在使回弹仪处于水平方向检测混凝土的侧面。当不能满足这一要求时， 可使回弹仪处于非水平方向检测混凝土的浇筑侧面、表面或底面；

（4）测区宜选在构件的两个对称可测面上，也可选在一个可测面上，且应分布均匀。在构 构件的重要部位或薄弱部位，必须布置测区，并应避开预埋件；

（5）测区面积不宜大于 0.04m2；

（6）检测面应为混凝土表面，并应清洁、平整、不应有疏松层、浮浆、油垢及蜂窝、麻面， 必要时可用砂轮清除疏松层和杂物，且不应有残留的粉末或碎屑；

（7）对弹击时产生颤动的薄壁或小构件应进行固定。

★The measurement area of the two components meets the following requirements

(1) The number of surveyed areas of each structure or component shall not be less than 10. For components with dimensions less than 4.5m in one direction and less than 0.3m in the other direction, the number of surveyed areas may be appropriately reduced, but not less than 5

(2) The distance between two adjacent test areas shall not exceed 2m at most, and the distance between the test area from the end of the member or the edge of the construction joint shall not exceed 0.5m and shall not be less than 0.2m;

(3) The survey area should be selected as far as possible to make the rebounder in the horizontal direction to detect the side of the concrete. When this requirement is not met, the hammer can be placed in a non-horizontal direction to detect the side, surface or bottom surface of the concrete;

(4) The measurement area should be selected on two symmetrical measurable surfaces of the component, or on a measurable surface, and should be evenly distributed. In the important parts or weak parts of the structural members, the measuring area must be arranged and the embedded parts should be avoided;

(5) The area of the survey area should not be greater than 0.04m2;

(6) The test surface shall be concrete surface, and shall be clean and flat, and shall have no loose layer, floating pulp, grease stain, honeycomb and pockmark. If necessary, the loose layer and debris may be removed by grinding wheel, and there shall be no residual powder. Or debris;

(7) The thin-walled or small members that vibrate during the impact shall be fixed.

★混凝土回弹仪回弹值的测量

1、检测时，回弹仪的轴线应始终垂直于结构或构件的检测面，缓慢施压，准确度数，快速 复位。

2、测点宜在测区内均匀分布，相邻两点的净距离不宜小于 2cm；测点距外露钢筋、预埋件 的距离不宜小于 3cm。测点不应分布在气孔或外露石子上，同一点只能弹一次。每一测区 记录 16 个回弹值，每一测点的回弹值精确到 1。

★Measurement of rebound value of concrete rebound hammer

1. When testing, the axis of the hammer should always be perpendicular to the detection surface of the structure or component, and slowly apply pressure, accuracy, and rapid reset.

2. The measuring points should be evenly distributed in the measuring area. The net distance between two adjacent points should not be less than 2cm; the distance between the measuring points and the exposed steel bars and embedded parts should not be less than 3cm. The measuring points should not be distributed on the stomata or exposed stones, and can only be played once at the same point. 16 rebound values are recorded for each survey area, and the rebound value of each measurement point is accurate to 1.

★混凝土回弹仪碳化深度的测量

1、回弹值测量完毕后，在有代表性的位置上测量混凝土的碳化深度值，测点数不应小于构 件测区数的 30%，取其平均值为该构件每测区的碳化深度值。当碳化深度极差大于 2 时， 应在每一测区测量碳化深度值。

2、碳化深度的测量，可采用适当的工具在测区表面形成直径 15mm 的孔洞，其深度应大于 混凝土的碳化深度。孔洞中的粉末和碎屑应清除干净，并不能使用水清洗。用 1%~2%的酒精溶液滴在孔内壁边缘处，已碳化的混凝土颜色不变，未碳化的混凝土变为红色，当已碳 化和未碳化界线清楚时，用深度测量工具测量已碳化混凝土的深度，测量不应小于 3 次， 取平均值，精确至 0.5mm。

★Measurement of carbonation depth of concrete rebound

1. After the rebound value is measured, the carbonization depth value of the concrete is measured at a representative position. The number of measurement points should not be less than 30% of the number of parts measured, and the average value is the carbonization depth value of each part of the component. . When the carbonization depth is greater than 2, the carbonization depth value should be measured in each measurement area.

2. For the measurement of carbonization depth, a suitable tool can be used to form a hole with a diameter of 15 mm on the surface of the test area, the depth of which should be greater than the carbonization depth of the concrete. The powder and debris in the holes should be removed and not washed with water. With 1%~2% phenolphthalein alcohol solution dripping at the edge of the inner wall of the hole, the carbonized concrete color is unchanged, the uncarbonized concrete turns red, and when the carbonized and uncarbonized boundary is clear, the carbonization is measured by the depth measuring tool. The depth of concrete shall be measured not less than 3 times and averaged to the nearest 0.5 mm.

★混凝土回弹仪回弹值计算

1、计算测区平均回弹值，应从该测区的 16 个回弹值中剔除 3 个a大值和 3 个a小值，余 下的 10 个回弹值按下式计算： 10 式中Rm — 测区平均回弹值，精确至0.1； Ri — 第i个测点的回弹值。

2、非水平方向时按下式修正： Rm R i 1 10 i Rm Rm Ra 式中Rm — 非水平检测时测区的平均回弹值，精确至0.1； Ra — 非水平状态检测时的回弹修正值，按附表查询。

3、水平方向检测混凝土浇筑顶面或底面时按下式修正： t t Rm Rm Ra b b Rm Rm Ra t b 式中Rm、Rm — 水平方向检测混凝土浇筑表面、底面时的测区回弹值平均值； b Rat 、Ra — 混凝土浇筑表面、底面回弹值的修正值，按附表查询。

4、 当检测时回弹仪既非水平状态有非混凝土的浇筑侧面时，应先修正角度，再修正浇筑面。

★ Calculation of rebound value of concrete rebound hammer

1. Calculate the average rebound value of the survey area. The three maximum values and three minimum values should be removed from the 16 rebound values of the survey area. The remaining 10 rebound values are calculated as follows: 10 where Rm is measured The average rebound value of the zone is accurate to 0.1; Ri — the rebound value of the i-th measuring point.

2. In the non-horizontal direction, press the following formula: Rm R i 1 10 i Rm Rm Ra where Rm - the average rebound value of the measurement area when non-level detection is accurate to 0.1; Ra - rebound during non-horizontal state detection Correct the value and query according to the attached table.

3. When the top or bottom of the concrete is poured in the horizontal direction, the following formula is corrected: tt Rm Rm Ra bb Rm Rm Ra tb where Rm, Rm - the average value of the rebound value of the test area when the concrete is poured on the surface and the bottom surface is detected horizontally; b Rat, Ra — The correction value of the concrete pouring surface and the bottom rebound value is inquired according to the attached table.

4. When the rebounder is not in a horizontal state with non-concrete pouring side when testing, the angle should be corrected first, and then the pouring surface should be corrected.

★校验方法

1，在室温 20±5℃的条件下进行。

2，率定须的重量及硬度应符合国家标准《回弹仪》GB/T 9138-2015 的要求。洛氏硬度 H RC 为 60±2。

3，将钢钻应稳固地平放在刚度大的混凝土实体上。

4， 回弹仪向下弹击时,弹击杆应分四次旋转,每次旋转 90°。

5，每个方向弹击三次,取其中a后三次读数稳定的回弹值进行平均

★Verification method

1. Perform at room temperature 20 ± 5 °C.

2, the required weight and hardness should meet the requirements of the national standard "rebounding instrument" GB/T 9138-2015. Rockwell hardness H RC is 60 ± 2.

3. Place the steel drill firmly on the concrete body with high rigidity.

4. When the hammer rebounds downward, the hammer should be rotated four times, 90° each time.

5, three times in each direction, take the rebound value of the last three readings to average