Dataset regarding the mechanical properties of roads unbound treated with synthetic fluid based on isoalkane and tall oil

The dataset revolves around the laboratory testing of an innovative additive technology for possible stabilization of unbound courses in road pavements. The product is a synthetic fluid based on isoalkane and tall oil pitch. Two test types are performed. Repeated load triaxial tests evaluate the elastic stiffness and the deformation properties of both untreated and treated aggregates. Moreover, some specimens are also tested before and after being subjected to freezing-thawing actions. A modified version of the rolling bottle test appraises the integrity with stripping loss on loose aggregates covered by the additive. Considering the necessity for road maintenance and rehabilitation worldwide, experimental data dealing with the stabilization potential of an innovative synthetic fluid stabilizer can be relevant for several road stakeholders.


a b s t r a c t
The dataset revolves around the laboratory testing of an innovative additive technology for possible stabilization of unbound courses in road pavements. The product is a synthetic fluid based on isoalkane and tall oil pitch. Two test types are performed. Repeated load triaxial tests evaluate the elastic stiffness and the deformation properties of both untreated and treated aggregates. Moreover, some specimens are also tested before and after being subjected to freezing-thawing actions. A modified version of the rolling bottle test appraises the integrity with stripping loss on loose aggregates covered by the additive. Considering the necessity for road maintenance and rehabilitation worldwide, experimental data dealing with the stabilization potential of an innovative synthetic fluid stabilizer can be relevant for several road stakeholders.
© 2021 The Author(s

Value of the Data
• Considering the high global amount of unbound layers belonging to road infrastructures that need maintenance and rehabilitation, the dataset characterizes an innovative synthetic fluid technology based on isoalkane and tall oil pitch for road stabilization. • The dataset can be beneficial to all the road stakeholders (engineers, researchers, entrepreneurs, agencies, …) that are interested in exploring the potential of new innovative technologies for road stabilization. • The behaviour of aggregates for road construction stabilized with an innovative synthetic fluid technology according to different application percentages can be appraised. Moreover, it is possible to analyse the data according to several regression models.

Data Description
The dataset is created during a laboratory testing campaign focusing on a Synthetic Fluid (SF) technology based on isoalkane and tall oil pitch for road stabilization [1] . The application of SF product on road aggregates represents an innovative approach to road maintenance and rehabilitation [2][3][4] . The investigation encompasses two kinds of test, namely Repeated Load Triaxial Test (RLTT) and a modified version of the Rolling Bottle Test (RBT), and the dataset comprises raw data and photos of the samples ( https://data.mendeley.com/datasets/x2s5mcwzdy/1 ). The experimental campaign encompasses both untreated (Unbound Granular Material, UGM) and treated aggregates.

Repeated Load Triaxial Test
part ( σ d,dyn ) and the static part ( σ d,st ) of the deviatoric stress σ d they are subject to. Similarly, columns H and I contain information regarding of the dynamic part ( σ t,dyn ) and the static part ( σ t,st ) of the triaxial stress σ t . The deformations of each sample are appraised by means of  Resilient modulus M R (defined in the next section) and the resistance against permanent deformation are the two main mechanical parameters that can be assessed by means of RLTTs. By way of example, the trend values of M R and axial plastic deformation for sample 01 treated according to SF-1 percentage ("Spec. SF-1 01") are reported in Figs. 1 a and 1 b, respectively, as a function of load cycles number N . The five RLTT loading sequences correspond to as many colours in Fig. 1 . Similar representations can be made for all the other RLTTs samples; furthermore, the data trend can be further analysed according to the several regression models available in literature [6 , 7] .

Experimental Design, Materials and Methods
The rock aggregates come from a local quarry located in Vassfjell, Heimdal, Norway, while the SF road stabilization technology is obtained from an industrial producer [2][3][4] . The research campaign took place at the Department of Civil and Environmental Engineering (Norwegian University of Science and Technology, Trondheim, Norway). The motivation of the investigation is connected with the global need to improve the maintenance and rehabilitation of road pavements [8 , 9] ; this is particularly relevant when it comes to ensuring efficient construction and stabilization of road unbound layers [10 , 11] .
Following the specifications of CEN standard "13286-7 Cyclic load triaxial test for unbound mixtures", each RLTT was accomplished according to the Multi-Stage Low Stress Level (MS LSL) and comprised thirty loading sequences [12] , where each of them corresponded to a combination of triaxial stress σ t and deviatoric stress σ d as reported in Fig. 2 . The latter one is applied according to a sinusoidal path with 10 0 0 0 pulses. For a constant value of σ t and a dynamic deviatoric stress σ d,dyn , the resilient modulus M R is with ε a,el the average axial resilient strain evaluated by the three axial LVDTs.
The RBT aims at estimating the adhesion between the bitumen covering loose aggregates and the aggregates themselves after exposure to mechanical stirring actions at room temperature [13] . According to the CEN standard "12697-11 Determination of the affinity between aggregate and bitumen", the evaluation is performed visually, thus leading to possible unprecise outcomes. In light of this, a modified version of RBT was performed pivoting on the dry weight of the aggregates measured before ( M 1 ) and after ( M 2 ) testing. Furthermore, the standard RBT was generalized in this research as SF instead of bitumen was selected in the testing campaign and fourteen time intervals of rotations were considered (1 h, 2 h, 3 h, 4 h, 5 h, 6 h, 8 h, 10 h, 12 h, 14h, 16 h, 20 h and 24 h) instead of the two ones (6 h and 24 h) defined by the code. The mass loss ML RBT is and can be expressed as a percentage.