In　the　hydration　process　of　a　cementitious　matrix,　considerable　interactive　physical　and　chemical　changes　take　place　inside　the　material　that　affect　both　the　composition　and　morphology　of　cement　paste　during　its　early　stages.　These　changes　are　properly　considered　within　a　multiscale　model　that　comprises　length-scale　integration　and　gives　access　to　the　effective　properties　via　upscaling.　In　this　paper,　the　kinetics　laws　of　the　induction　period,　nucleation,　and　growth-controlled　and　diffusion-controlled　hydration　are　considered,　and　the　evolutions　of　volume　fractions　of　clinker　phases　and　various　hydration　products　with　respect　to　the　hydration　degrees　are　simulated.　Based　on　the　microstructural　evolution　of　cement　hydration,　the　properties　of　cement　paste　are　estimated　with　a　combination　of　self-consistent　and　Mori-Tanaka　schemes,　and　the　mechanical　properties　of　carbon　nanotube-reinforced　cement-based　composites　on　the　macroscale　are　then　predicted　with　a　meshless　method　on　the　basis　of　the　moving　least-squares　approximation.　Finally,　the　accuracy　and　efficiency　of　the　proposed　model　are　verified　by　comparisons　with　experiments　and　finite　element　model　simulations.　(C)　2017　Elsevier　B.V.　All　rights　reserved.