Mass　concrete　is　widely　used　in　large-scale　projects,　including　metro　upper　cover　structures,　water　conservancy　dams,　and　heavy　equipment　foundations,　among　others,　necessitating　the　process　of　health　monitoring　in　mass　concrete　construction.　The　development　of　reliable　and　simple　strength-monitoring　methods　for　mass　concrete　is　challenging　because　the　inner　temperature　of　mass　concrete　is　high　and　changes　a　lot.　This　study　proposes　a　strength-monitoring　approach　for　mass　concrete　using　barium　titanate–bismuth　ferrite/polyvinylidene　fluoride　(BT–BFO/PVDF)　nanocomposite　piezoelectric　sensors,　wherein　the　new　sensors　are　embedded　as　actuators　and　sensors　in　mass　concrete.　The　stress　wave　generated　by　the　BT–BFO/PVDF　piezoelectric　sensors　is　used　to　monitor　the　specimen’s　strength　for　28　days.　The　piezoelectric　voltage　received　by　the　sensors　in　mass　concrete　is　analyzed.　The　experimental　results　indicate　that　the　signal　received　by　the　BT–BFO/PVDF　sensors　is　not　easily　affected　by　the　internal　temperature　of　mass　concrete　compared　with　that　of　the　traditional　PVDF　piezoelectric　sensors.　The　signal　parameters　sensitive　to　concrete　strength　variation　and　the　change　trend　of　concrete　strength　are　closely　related　to　the　piezoelectric　voltage.　Therefore,　the　proposed　approach　using　BT–BFO/PVDF　nanocomposite　piezoelectric　sensors　is　efficient　(error　＜　10%)　in　mass　concrete　monitoring.　Moreover,　the　monitoring　results　do　not　need　temperature　compensation.　The　physical　meaning　of　the　obtained　strength　prediction　formula　is　proposed.　An　experimental　system　based　on　PVDF　dynamic　strain-sensing　characteristics　is　established.　©　2024　by　the　authors.