Experimental Data of Post-installed Screw Pullout (PSP) test for assessing compressive strength of cementitious materials

A recently developed in-situ test method, the Post-installed Screw Pull-out (PSP) test showed potential to be used in the field of assessing compressive strength of cementitious materials. The test is based on the controlled pull-out of a standard concrete screw where the failure pattern is dominated by a complete pull-out failure. During the pullout operation, the load is transferred through the screw thread to the surrounding materials, such as concrete and/or mortar.
Screw anchors can experience different failure modes, including steel failure, concrete cone failure, complete pull-out failure, or a combined cone and pull-out failure. Existing literature and design manuals consider cone failure as critical. The data related to the complete pull-out failure of the concrete screw is limitedly available. The datasets presented here were generated based on a systematic experimental design.
The datasets presented here contain the results of the PSP test in different types of concrete/mortar samples. The PSP test was carried out as per the configuration and methodology developed by Al-Sabah et al (2021) 'The post-installed screw pull-out test : Development of a method for assessing in-situ concrete compressive strength' (https://doi.org/10.1016/j.jobe.2020.101658).
The data is presented in Microsoft Excel (2023) where the load and displacement values of the screw produced during the PSP tests are provided. The tab designation that are used within an excel file are as follows:
(M or LS or BR or LW-X)-Y-Z
where,
M – Mortar samples
LS – Concrete with limestone as coarse aggregate
BR - Concrete with brick chips as coarse aggregate
LW - Concrete with lightweight pumice as coarse aggregate
X – Mix design designation
Y – Sample tested at Y days
Z – Sample number.
Column C (LVDT 1) in the Excel file shows the displacement of the screw head and Column D (LVDT 2) provides the displacement of the sample surface. The difference between the displacement of the screw head and the sample surface was calculated in Column E (Displacement) in order to accurately determine the actual displacement of the screw relative to the concrete sample.
Each Excel file also contains a ‘Figure’ tab which shows the generated curves based on the load and displacement values from each sample from the other tabs in the file.

近年来新兴的原位测试方法——后置螺钉拉拔测试（Post-installed Screw Pull-out, PSP），在胶凝材料抗压强度评估领域展现出显著应用潜力。该测试基于对标准混凝土螺钉的可控拉拔操作，其破坏模式以完全拉拔破坏为主。拉拔过程中，荷载通过螺钉螺纹传递至周边基体材料，如混凝土和/或砂浆。

螺钉锚栓可呈现多种破坏模式，包括钢材破坏、混凝土锥体破坏、完全拉拔破坏，以及锥体与拉拔混合破坏。现有文献与设计规范均将锥体破坏视为控制性破坏模式，但针对混凝土螺钉完全拉拔破坏的相关数据仍较为匮乏。本数据集基于系统化实验设计构建而成。

本数据集包含不同类型混凝土/砂浆试样的PSP测试结果，测试严格遵循Al-Sabah等人2021年发表的《后置螺钉拉拔测试：原位混凝土抗压强度评估方法的开发》（https://doi.org/10.1016/j.jobe.2020.101658）中提出的测试配置与方法开展。

本数据集以Microsoft Excel（2023）格式存储，包含PSP测试过程中采集的螺钉荷载与位移数据。Excel文件内的工作表命名规则如下：
(M 或 LS 或 BR 或 LW-X)-Y-Z
其中：
M：砂浆试样；
LS：以石灰岩作为粗骨料的混凝土；
BR：以砖屑作为粗骨料的混凝土；
LW：以轻质浮石作为粗骨料的混凝土；
X：配合比编号；
Y：试样养护至Y天时开展测试；
Z：试样序号。

Excel文件的C列（LVDT 1，线性可变差动变压器1，Linear Variable Differential Transformer 1）记录螺钉头部的位移，D列（LVDT 2）记录试样表面的位移。为精准测定螺钉相对于混凝土试样的实际位移，E列（位移，Displacement）通过计算螺钉头部与试样表面的位移差值得到。

每个Excel文件还包含一个"Figure"工作表，其展示基于文件内其他工作表中各试样的荷载与位移数据生成的对应曲线。