Investigation of the Characteristics of Silane-modified Titanium Gypsum Asphalt Mortar
In order to lessen the environmental issues caused by the accumulation of titanium gypsum and to also alleviate the cur-rent situation of road material shortage,titanium gypsum and silane coupling agent-treated titanium gypsum were used to partially or completely replace limestone mineral powder.Additionally,the effects of titanium gypsum and modified titanium gypsum on the con-ventional and rheological properties of asphalt mastic were investigated.First,a laser particle size meter and a scanning electron mi-croscope were used to examine the micro-morphology and particle size distribution of titanium gypsum,modified titanium gypsum,and limestone mineral powder.Subsequently,asphalt mortar containing varying amounts of titanium gypsum and modified titanium gyp-sum dosage was prepared.The asphalt mortar's three main indicators(penetration,ductility,and softening point),as well as its high temperature and low temperature rheological performances,fatigue resistance,were tested using conventional testing methods,tem-perature scanning test,frequency scanning test,multiple stress creep recovery test(MSCR),linear amplitude scanning test(LAS),and bending beam rheological test(BBR).The findings indicated that:titanium gypsum and modified titanium gypsum had a wider particle size range and a rougher surface.The addition of titanium gypsum and modified titanium gypsum decreased the asphalt mor-tar's ductility,penetration,unrecoverable creep flexibility(Jnr),fatigue life(Nf),creep rate(m)and phase angle(δ),while the softening point,complex modulus(G*),resilience(R)and stiffness modulus(S)were increased.In other words,performance at high temperatures was enhanced while low temperatures and weariness were decreased.The low-temperature performance was de-creased and the high-temperature performance and elastic recovery indexes of modified titanium gypsum outperformed those of tita-nium gypsum at the same temperature.The determination of the viability of utilizing titanium gypsum in the creation of asphalt mix-tures provides a path forward for the resource's exploitation.
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