Data on characterization of dredging sediment of Safi harbour – Morocco

This data article reports the geotechnical (the water content, the specific density, the Atterberg limits, the methylene blue value and the grain size distribution), chemical (the content of organic matter and calcium carbonate) and mineralogical characteristics of sediments dredged in Safi harbour (Morocco). Samples are collected in seven point (P1, P2, P3, P4, P5, P6 and P7) of two zones of port (the channel zone and the basin zone), placed in opaque drums and kept in a cold room protected from light. Then the homogeneous samples are mixed. We note S1 the mixture of P1, P2 and P3 correspond to the basin zone of the port and S2 the mixture of P4, P5, P6 and P6 correspond to the channel zone of the port.


Data description
The dataset in this article describes geotechnical, chemical and mineralogical characteristic of sediment dredged in Safi harbour.
In Table 1, we present the evolution of water content after drying for one month and the density specific, of five sampling of sediment S1 and S2 dredged in Safi harbour.
In Table 2, we present the particular size distribution of three sampling of sediment S1 and S2 dredged in Safi harbour.
We present in Table 3 the cleanliness of sediment S1, S2 dredged in Safi harbour using the methylene blue test supplements the sand equivalent, and Atterberg limits test (five samples for each test).
Finally, in Table 4 we expose Chemical and mineralogical characteristics of sediment S1 and S2 dredged in Safi harbour.

Sampling
The sampling is a crucial step in the process of characterization of a sediment. The goal is to obtain representative samples that reflects all the characteristics of the site. Sampling concerns two areas of the port: zone 1 and zone 2 which correspond respectively to the channel of access and the basins of the port of trade. Samples are collected by a diver and placed in opaque 20 Littre drums and then they Specifications Table   Subject Civil and Structural Engineering Specific subject area Building materiel Type of data Table  Figure  How data were acquired The water content is measured using the French standard NF P 94-050. The particle-size-distribution is measured according to the French standards NF P 94-056 and NF P 94-057. The density is measured following the AFNOR standard NF P 94-054. The test of Atterberg limits is carried out in accordance with the standard NF P 94-051. The value of the methylene test is realized by following the standard NF P 94-068. The determination of the organic content is measured according to AFNOR standards NF P 94-055 and XP P 94-047. The analysis of the content of calcium carbonate is realized according to the principles of the standard NF P 94-048. The mineralogical analyses are performed using the X-ray powders diffraction technique.
The collected data are processed by a software, which gives directly the spectra. Data format Raw and analysis Parameters for data collection Samples are collected by a diver and placed in opaque 20 Littre drums and then they are kept in a cold room protected from light. On each container, we mark the following information: The identification code of the sampling station, the date, the time and depth. Description of data collection Sampling concerns two areas of the port: zone 1 and zone 2 which correspond respectively to the channel of access and the basins of the port of trade. In a first step, sediment samples were collected in 7 points (4 points in zone 1 and 3 point in zone 2). Then the samples were homogenized manually in order to have a single representative sample for each zone. We note S1 for the mixture of P1, P2 and P3 corresponding to the zone 1 and S2 for the mixture between P4, P5, P6 and P7 corresponding to the zone 2. Data source location SAFI HARBOUR, SAFI, MORROCO (32.312642, À9.252548) Data accessibility Data incorporated within this article.

Value of the Data
The data represents the geotechnical, chemical and mineralogical characteristics of sediments dredged in Safi harbour (Morocco) in order to valorise them in civil engineering works. These data can be beneficial to all researchers works on valorisation of sediment dredging in port These data can initiate port users in developing countries to the possibility of valorise dredged sediments instead of dumping them into the sea.
are kept in a cold room protected from light. On each container, we mark the following information: The identification code of the sampling station, the date, the time and depth. In a first step, sediment samples were collected in 7 points (4 points in zone 1 and 3 point in zone 2). Then the samples were homogenized manually in order to have a single representative sample for each zone. We note S1 for   Fig. 1).

Geotechnical characterization
The determination of the geotechnical characteristics of sediments consists in measuring the values of the water content, the specific density, the Atterberg limits, the sand equivalent, the methylene blue and the grain size distribution.
Measurement of the water content of a soil is the most common action in geotechnical and the most fundamental allows expressing many other values by bringing it to an expression of dry mass [1]. In our measures, we used the French standard NF P 94-050.
The particle-size-distribution analysis is used to determine the size of grain and the granularity (dimensional distribution of grains) of an aggregate or a soil. The aggregates are split by passing through different sieves up to 80 mm ac-cording to the French standard NF P 94-056. Below this dimension, the analysis is done by sedimentation by applying the instructions of the standard NF P 94-057.
The density (defined by the ratio between the mass of a sample dried in oven and the volume that it occupies in the water) is measured following the AFNOR standard NF P 94-054.
The determination of the Atterberg limits allows us to determine the plasticity index PI and the consistency index CI. The test is carried out in accordance with the standard NF P 94-051], it is applied on soils moderately to very clayey. For this reason, the determination of the "cleanliness" by Atterberg limits will be realized only on the sample S1.
The value of the methylene blue is the second parameter to characterize the "cleanliness" of a soil. His goal is to evaluate overall clay richness of the soil; This measurement uses the adsorption Table 3 Cleanliness of sediment S1 and S2 dredged in Safi harbour.  Table 4 Chemical and mineralogical characteristic of sediment S1 and S2 dredged in Safi harbour. properties that the clay particles are nearly the only ones to possess in the soil, the fact that their surfaces are electrically charged, they adsorb a quantity of methylene blue proportional to the available surfaces when they are put in the presence of a solution of this dye (methylene blue). The test is realized by following the standard NF P 94-068. The third parameter used to characterize the "cleanliness" of a soil is the sand equivalent.

Chemical and mineralogical characterization
The determination of the mineralogical and chemical characteristics allows us to understand the interactions between the sediment and the materials mixed with [2].
We had measured the content of organic matter and calcium carbonate and we had carried out a mineralogical analysis.
The determination of the organic content in sediment is an important step for the identification of characteristics and the track of valorisation. In effect, the organic matter is a component undesirable in a material of construction. We will use two methods to calculate the organic content of the sediment: the chemical method and the calcination method according to AFNOR standards NF P 94-055 and XP P 94-047 respectively [3,4].
The analysis of the content of calcium carbonate has been realized according to the principles of the standard NF P 94-048.
The mineralogical analyses are performed using the X-ray powders diffraction technique.