Characterisation data for open-air processed common water reed (Phragmites australis) ash and papyrus (Cyperus papyrus) ash

Currently, there are a lot of discussions on the production of sustainable cement for construction purposes, unlike the conventional ordinary Portland cement (OPC), as its production, transportation, and application contribute to the generation of greenhouse gases, hence, climate change. Consequently, limestone, the primary material used to produce OPC, is non-renewable. Therefore, there is a need to use sustainable materials to make cementitious materials to achieve sustainable construction. This has led to a lot of research focussing on the valorisation of agricultural wastes and less economical, no-food lignocellulosic plants in producing sustainable and environmentally friendly cementitious materials commonly known as Supplementary Cementitious Materials (SCMs). The agrowastes ashes include rice husk ash (RHA), sugarcane bagasse ash (SCBA), and corn cob ash (CCA), among others. In contrast, the lignocellulosic plants’ ashes include common water reed ash (CWRA) and cyperus papyrus ash (CPA). There has been the belief that these pozzolanic materials are homogenous. However, these ashes are highly heterogeneous when they undergo microscopic analysis. Therefore, the current data paper provides Laser Diffraction Spectroscopy (LD) for Particle Size Distribution (PSD), Fourier-transform infrared spectroscopy (FT-IR), X-Ray Fluorescence (XRF), and Scanning Electron Microscope (SEM) data for unprocessed CWRA and CPA in the form of tables, micrographs, and figures for microscopic analysis. This data helps characterise and evaluate CWRA and CPA's potential as pozzolanic materials, especially as road construction materials, and will be beneficial for other scientists to better understand unprocessed CWRA and CPA mineral information development biologically inspired materials for biologically inspired materials sustainable development across many disciplines.


a b s t r a c t
Currently, there are a lot of discussions on the production of sustainable cement for construction purposes, unlike the conventional ordinary Portland cement (OPC), as its production, transportation, and application contribute to the generation of greenhouse gases, hence, climate change. Consequently, limestone, the primary material used to produce OPC, is non-renewable. Therefore, there is a need to use sustainable materials to make cementitious materials to achieve sustainable construction. This has led to a lot of research focussing on the valorisation of agricultural wastes and less economical, no-food lignocellulosic plants in producing sustainable and environmentally friendly cementitious materials commonly known as Supplementary Cementitious Materials (SCMs). The agrowastes ashes include rice husk ash (RHA), sugarcane bagasse ash (SCBA), and corn cob ash (CCA), among others. In contrast, the lignocellulosic plants' ashes include common water reed ash (CWRA) and cyperus papyrus ash (CPA). There has been the belief that these pozzolanic materials are homogenous. However, these ashes are highly heterogeneous when they undergo microscopic analysis. Therefore, the current data paper provides Laser Diffraction Spectroscopy (LD) for Particle Size Distribution (PSD), Fourier-transform infrared spectroscopy (FT-IR), X-Ray Fluo-rescence (XRF), and Scanning Electron Microscope (SEM) data for unprocessed CWRA and CPA in the form of tables, micrographs, and figures for microscopic analysis. This data helps characterise and evaluate CWRA and CPA's potential as pozzolanic materials, especially as road construction materials, and will be beneficial for other scientists to better understand unprocessed CWRA and CPA mineral information development biologically inspired materials for biologically inspired materials sustainable development across many disciplines.

Description of data collection
The CWR and CP were sun-dried and burned on a hard surface to avoid contamination by foreign materials. After cooling, the CWRA and CPA were sampled in airtight polythene bags for microscopic analysis using Laser Diffraction Spectroscopy (LD) for Particle Size Distribution (PSD), FT-IR, XRF spectroscopy, and SEM.

Value of the Data
• Microscopic analysis requires expensive equipment and is time-consuming. These data fully show the ultra-structures of the unprocessed CWRA and CPA as green pozzolanic materials based on Laser Diffraction, FT-IR, Raman spectra, and SEM micrographs be useful for researchers who do not have access to these types of equipment. • The data presented here are valuable to researchers investigating the partial replacement of cement in all types of concrete with CWRA and CPA. • Other researchers may use these data to better understand CWRA and CPA mineral information to develop biologically inspired materials and extract green nanoparticles/nanomaterials. • The data are relevant for government agencies seeking a classification system to characterise ashes from CWRA and CPA as pozzolanic materials.

Data Description
The data obtained show particle size distribution (PSD) by Laser Diffraction (LS) method, FT-IR spectra, chemical composition XRF data, and SEM micrographs of CWRA and CPA specimen ashes. The collected data includes three (3) tables, three (3) figures, and raw data to be found on the following link: https://data.mendeley.com/datasets/n3vzfpkt9p/1 . The three tables and figures are described within where they appear in the article. The supplementary data No. 1 include the raw data for particle size distribution as obtained from the Mastersizer 20 0 0. The supplementary data No. 2 contains the raw data from the Fourier transform infrared analyses using the BRUKER Tensor 47. The supplementary data No. 3 contains the raw SEM micrographs as obtained from the Hitachi FlexSEM 10 0 0.

Particle Size Distribution
Particle size distribution is a valuable characteristic of materials, especially pozzolanic materials. It defines the reactivity of the material. Coarse materials and fine materials react differently. The most common approach for expressing laser diffraction results is to report the D10, D50, and D90 values based on a volume distribution. Table 1 details the D 10 , D 50 , and D 90 of CWRA and CPA under different LS conditions, including obscuration. The raw data is provided as Supplementary material No. 1-particle size distribution.

FT-IR Spectra
FTIR spectral identified the critical chemical compound existing in the unprocessed lignocellulosic bio-pozzolan (CWRA and CPA), as revealed in Fig. 1

X-Ray Fluorescence
The chemical compositions of CWRA and CPA were characterised by the X-ray fluorescent (XRF) BRUKER model S8 TIGER XRF spectrometer. Table 2 shows the results of the experiment which are uploaded on https://data.mendeley.com/datasets/n3vzfpkt9p/1 .  Fig. 2 shows the sampled SEM micrographs for CWRA and CPA specimens. The ImageJ software can analyse the micrographs to determine the diameters, areas and length [3 , 4] . The raw SEM micrographs are provided as Supplementary material No. 3-SEM Raw Data uploaded at https://data.mendeley.com/datasets/n3vzfpkt9p/1 .

Synthesis of CWRA and CPA
The common water reeds were obtained on river Kafue in Zambia, while the cyperus papyrus were obtained from Adjumani on River Nile in Uganda. The details of the locations of collecting theses samples are provided in Table 3 . The Fig. 3 shows the process chart for obtaining the open-air processed Common Water Reed ( Phragmites australis ) Ash and Cyperus Papyrus ( Cyperus Papyrus ) Ash. The general process involve cutting the samples from there natural habitats, drying them on hard surface and burning them in open-air under uncontrolled conditions. Therefore, representative samples are collected and packaged in airtight polythene bags for advanced materials caharacterisation.

Fourier-Transform Infrared Spectroscopy
Fourier-transform infrared spectroscopy (FT-IR) spectra were recorded using BRUKER TENSOR 27 in the range of 450 0-50 0 cm −1 as reported by different researchers [10][11][12] . Several runs were made to get the most uniform spectra.

X-Ray Fluorescence (XRF) Spectroscopy
The chemical compositions of CWRA and CPA were characterised by a high performance X-Ray Flourescent (XRF) spectrometer (Model: S8 TIGER, Bruker, Germany), equipped with an Rh anode X-ray tube (4 kW, 60 kV and 170 mA). A detailed description of this spectrometer is reported by some researchers [13 , 14] .

Scanning Electron Microscope (SEM) Investigation
The Scanning Electron Microscope (SEM) data, the Hitachi FlexSEM 10 0 0, was used after gold plating as used by different studies [15 , 16] .

Ethical Approval
It is not required for this study as no humans or animals were studied by any of the authors.

CRediT Author Statement
Martin Aluga: Performed conceptualization; Laboratory work and writing -original draft; Chewe Kambole: Performed writing -review & editing.

Declaration of Competing Interest
No competing interests.