As was discussed in Ref Section there is a

As was discussed in Ref. [2] (Section 4.1), there is a dependence of the slip length and coefficients on the flow channel thickness ; however the dependence is removed completely for the channel height larger than 100 times of fiber radius , where the universal slip behavior is observed independent of the channel size. All the data presented here is taken from the case . From the data on the slip length and slip coefficient presented in Tables 1–6 can be fitted in a universal way in a closed form, as a function of the dimensionless void length and the fitted equations in the longitudinal and the transverse direction is given as The normalized permeability in both directions can be fitted also as follows: In the above equations, the symbols and denote longitudinal and transverse directions, respectively and can be found in section 4.2 in Ref. [2]. Plots in Fig. 2 were constructed using the fitted form in Eqs. (1)–(3). The accuracy of the fitted equation can be found in Fig. 12 in Ref. [2] for the dimensionless slip coefficient, which can be calculated as .
Acknowledgements The authors acknowledge the financial supports from the National Research Foundation of Korea (NRF-2016R1A2B4014326).
Data
Experimental design, materials and methods
Specifications Table
Value of the data
Data Data on the synthesis and physicomechanical characteristics of 2 types of environment-friendly soilcrete materials are presented. Soilcrete samples contained different contents of natural clay ground soil or crushed quarry sand of a limestone origin as replacement of the aggregate phase. Metakaolin has been added at variable contents as a mineral additive to the ordinary Portland cement-based binder mix, at different water/binder ratio values (W/B). Specifically, the Research Database presents measured physical and mechanical properties such as the 28 days compressive strength (f), the modulus of elasticity (E) and the strain at maximum strength (ε) (Fig. 1) of a large set of cylindrical specimens with a height-to-diameter (h/d) ratio equal to 2 (h/d=2) which have been tested under uniaxial conotoxin [1–3].
Experimental design Three categories of binders (B), variable in synthesis, were investigated; the 1st that consisted of 100% w/w CEM I 42.5 N Portland cement (PC) used as reference, the 2nd produced by mixing 90% w/w PC and 10% w/w metakaolin (MK) in the dry mix and the 3rd by mixing 80% w/w PC and 20% w/w MK (in the dry mix) as partial replacement. Homogeneity of all 3 categories of blends was reached after mixing MK and PC without further grinding in a laboratory swing mill for 1h [1–3]. Batches of samples that correspond to 2 specific types of soil materials were investigated; natural clay ground soil (CGS) and crushed quarry limestone sand (CQLS) were used as replacement of the aggregate phase. First type soilcrete material, entitled as clay-based soilcrete, produced by mixing 50% and 70% w/w CGS (in the dry mix) with 50% and 30% w/w binder at 2 different water/binder (W/B) ratio values of 0.48 and 1.2. High workability and optimal flow properties for samples with W/B equal to 0.48 was achieved by the addition of 2.0% w/w (of the cementitious materials) superplasticizer (SP), as presented in Table 1. Second type soilcrete material, entitled as sand-based soilcrete, produced by mixing 50% and 70% w/w CQLS (in the dry mix) with 50% and 30% w/w binder at 3 different W/B ratio values of 0.4, 0.7 and 1.0. As Similarly to the first type soilcrete material samples, high workability and optimal flow properties for samples with W/B equal to 0.4 were achieved by the addition of 2.0% w/w SP (of the cementitious materials), as listed in Table 2. Refs. [1–3] provide a detailed description of the experimental set-up.
Materials Raw materials used for the preparation of samples were:
Methods Particle size distribution for CGS (before sieving at 2mm) and CQLS (before sieving at 4.75mm) resulted by conducting sieve analysis according to ASTM D6913-04, ASTM E11 and C136 standards, respectively [1–3]. CGS and CQLS were dried at 105°C for 5 days and at 105°C for 24h respectively, in an electrical laboratory oven and then sieved in order to pass a 2.00 and 4.75mm sieve respectively [1–3]. Mixing of binder batches was performed in a laboratory swing mill for 1h without further grinding of solid constituents until homogeneity of the blends was reached [1–3]. Soilcrete samples were prepared by mixing the binder-CGS and binder-CQLS mixtures with tap water at 20°C in an 80L capacity laboratory mixer used for concrete production [1–3].