def get_materials_concrete(model):
    """
    Get the concrete mixes in the model
    
    returns: conc_mixes (dict)
    """
    #get the model mixes
    conc_mixes={};#[['Mix Name','Density','Density for Loading','fci','fc','fcui','fcu',
                 #'Poissons','Thermal','Ec Calc','User Eci','User Ec']];
    for mix in model.concretes.concretes:
        mix_name=mix.name;
        coefficient_of_thermal_expansion=mix.coefficient_of_thermal_expansion;
        fc_initial=mix.fc_initial;
        fc_final=mix.fc_final;
        fcu_initial=mix.fcu_initial;
        fcu_final=mix.fcu_final;
        poissons_ratio=mix.poissons_ratio;
        unit_mass=mix.unit_mass;
        unit_unit_mass_for_loads=mix.unit_unit_mass_for_loads;
        if(unit_unit_mass_for_loads>10**4):
            unit_unit_mass_for_loads='Density';
        user_Ec_initial=mix.user_Ec_initial;
        user_Ec_final=mix.user_Ec_final;
        use_code_Ec=mix.use_code_Ec;
        conc_mixes[mix_name]={'unit_mass':unit_mass,
                              'unit_unit_mass_for_loads':unit_unit_mass_for_loads,
                              'fc_initial':fc_initial,
                              'fc_final':fc_final,
                              'fcu_initial':fcu_initial,
                              'fcu_final':fcu_final,
                              'poissons_ratio':poissons_ratio,
                              'coefficient_of_thermal_expansion':coefficient_of_thermal_expansion,
                              'use_code_Ec':use_code_Ec,
                              'user_Ec_initial':user_Ec_initial,
                              'user_Ec_final':user_Ec_final};
    return conc_mixes;