Dataset "Spatial variation of ultrasonic velocity and attenuation of segregated lightweight aggregate concrete"

This repository contains the experimental data and the analysis code supporting the article: Tenza-Abril, A.J.; García-Vera, V.E.; Miró-Oca, M.; Lanzón, M.; Benavente, D. Spatial variation of ultrasonic velocity and attenuation as a non-destructive indicator of segregation in lightweight aggregate concrete. Submitted to *Construction and Building Materials* (2026). Summary: Density-matched lightweight aggregate concrete (LWAC), target oven-dry density 1700 kg/m³, CEM I 52.5 R = 350 kg/m³, w/c = 0.60, constant paste volume fraction 0.322. Four expanded-clay aggregates (two nominal grades — M and HS — each from two manufacturers, Leca® and Laterlite®) × six vibration times (5, 10, 20, 40, 80, 160 s) = 24 cylinders (150 × 300 mm). Each cylinder was sectioned into seven discs (disc 1 = top, disc 7 = bottom). Ultrasonic descriptors (Vp, Vs, Vp/Vs, spatial attenuation, dynamic modulus) were measured twice per disc, in two orthogonal directions of the same section; oven-dry density and splitting tensile strength were measured once per disc. Content: `LWAC_ultrasonics_segregation_dataset.csv` -- Tidy dataset, one row per ultrasonic reading (336 rows). Open format, UTF-8, comma-separated. `LWAC_ultrasonics_segregation_dataset.xlsx` -- Same data with a `Data dictionary` sheet and a `Notes` sheet. `analisis_LWAC_ultrasonidos.py` -- Reproducible analysis script (REML mixed model, ANCOVA, TOST equivalence, segmented regression, bootstrap, height-sensitivity simulation). `LICENSE.txt` -- MIT License, applies to the analysis code. `LICENSE-DATA.txt` -- CC BY 4.0 notice, applies to the data files. `README.md`-- contents, experimental desing, data dictionary, reproducing the analysis, licenses and how to cite. Tenza-Abril, A.J.; García-Vera, V.E.; Miró-Oca, M.; Lanzón, M.; Benavente, D. (2026). Dataset and analysis code for "Spatial variation of ultrasonic velocity and attenuation as a non-destructive indicator of segregation in lightweight aggregate concrete" [Data set]. Zenodo. https://doi.org/10.5281/zenodo.21821391