Acoustic emission signals in concrete beams under 3-point bending (plain concrete, steel fibre reinforced concrete, steel bar reinforced concrete)

The DataSet contains the results of the mechanical behaviour of concrete beams with dimensions 40 x 40 x 160 cm3under the 3-point bending. Two concrete mixes, both based on the same design, were produced in the test programme. Mixture #1 was the plain concrete (PC), consisting of cement CEM I 42.5R (380 kg/m3), water (165 kg/m3), aggregate 0/2 mm (648 kg/m3), aggregate 2/8 mm (426 kg/m3), aggregate 8/16 mm (754 kg/m3) and superplasticizer (0.8% of the cement content). Mixture #2 was similar to mixture #1 but also contained steel fibres (SF) at a rate of 0.6% of the total concrete volume. The steel fibres were 25 mm in length, 0.5 mm in diameter, and had hooked ends. In addition, a 6mm diameter steel bar was used as a reinforcement to produce a reinforced concrete sample based on mixture #1.
The bending test was performed using a Zwick/Roell Z10 universal testing machine (UTM). The parameters of the test were: a preload of 50 N, a constant mid-span displacement increment of 0.1 mm/min.
During the bending test, acoustic emission (AE) measurements were carried out. Acoustic emission signals were recorded using the Vallen AE system with a threshold of 34 dB and a sampling rate of 10 MHz. Four multilayer piezoelectric transducers were used for wave sensing. The arrangement of the sensors (numbered from S1 to S4) is shown in the figure below. The experimental analysis was performed on three beams made of:
Plain concrete (beam #1)
Concrete with 0.6% steel fibres (beam #14)
Steel bar-reinforced concrete (beam #7)
The UTM file has (file extension *.txt) extension and contains the time of the test (in s, 2nd column), force (in N, 3rd column) and displacement of traverse (in mm, 4th column). The AE data are contained in two types of files:  the primary data file (file extension *.pridb) contains the AE feature data; the transient data file (file extension *.tradb) contains the sampled signal. Pridb-files and tradb-files can be opened in any program that supports the SQLite3 standard.

本数据集收录了尺寸为40×40×160 cm³的混凝土梁在三点弯曲荷载下的力学性能试验结果。试验制备了两种配合比相同的混凝土拌和料：拌和料#1为素混凝土（Plain Concrete, PC），其组成包括CEM I 42.5R型水泥（380 kg/m³）、水（165 kg/m³）、0/2 mm级配骨料（648 kg/m³）、2/8 mm级配骨料（426 kg/m³）、8/16 mm级配骨料（754 kg/m³）以及减水剂（掺量为水泥质量的0.8%）；拌和料#2与拌和料#1基本一致，但额外掺入了占混凝土总体积0.6%的钢纤维（Steel Fibres, SF），该钢纤维长度为25 mm、直径0.5 mm，端部带有弯钩。此外，基于拌和料#1还制备了配置6 mm直径钢筋的钢筋混凝土试样。
弯曲试验采用Zwick/Roell Z10型万能试验机（Universal Testing Machine, UTM）完成，试验参数设置为：预加载荷载50 N，跨中位移加载速率恒定为0.1 mm/min。试验过程中同步开展声发射（Acoustic Emission, AE）监测，采用Vallen AE系统采集声发射信号，系统阈值设置为34 dB，采样率为10 MHz。本次试验采用4个多层压电换能器进行波信号采集，传感器编号为S1至S4，具体布置方式见下图。
本次试验分析共采用3根梁式试件，分别为：素混凝土梁（梁#1）、掺0.6%钢纤维混凝土梁（梁#14）、钢筋混凝土梁（梁#7）。
万能试验机采集的数据存储为*.txt格式文件，文件内容包含试验时长（单位：s，第2列）、荷载值（单位：N，第3列）及试验机横梁位移（单位：mm，第4列）。声发射数据包含两类文件：主数据文件（*.pridb）存储声发射特征参数数据；瞬态数据文件（*.tradb）存储采样得到的原始信号。pridb文件与tradb文件均可通过任意支持SQLite3标准的程序打开。