The invention relates to a
silicone caulking material for concrete expansion joints of ballastless tracks and a preparation method thereof. The caulking material is composed of the following raw materials in parts by
mass: 100 parts of alpha,
omega-dihydroxy
polydimethylsiloxane, 10-35 parts of a
plasticizer, 70-120 parts of filler, 0.5-10 parts of a thixotropic agent, 6-12 parts of a crosslinking agent, 1-8 parts of a chain
extender, 0.3-3 parts of an adhesion
promoter, 0.1-2 parts of a catalyst, 0.005-0.5 part of a
pigment, 0.5-5 parts of a storage stabilizer, and 1-3 parts of a deep curing agent. The
silicone caulking material is prepared by using the preparation method disclosed by the invention. The
silicone caulking material has the characteristics of good construction performance, high displacement capacity, good interface adhesion, excellent
aging resistance, long storage life, good deep-layer curing performance, and the like, is suitable for being applied to concrete expansion joints of ballastless tracks of high-speed rails, expansion joints of airport pavements and
cement concrete pavements, and the like, and also can be applied to the failure repair of existing expansion caulking materials.