The time-varying behavior of concrete strength in typical environments is investigated by means of collecting, categorizing, and analyzing long-term exposure test data for concrete subjected to general atmospheric and marine conditions. The strength of concrete after molding is not constant. Over time, the hydration of cement becomes more complete, leading to a continuous increase in its long-term strength (even up to 20 years), eventually reaching a stable period. Due to environmental erosion, the strength of concrete decreases slowly over a longer period of time. The collected exposure test data demonstrate that, in the general atmospheric environment, the compressive strength of concrete exhibits a continuous increase for approximately the initial 20 years. The increase rate is relatively rapid during the first 1~5 years and gradually decelerates thereafter. A relatively stable trend is observed during the 20th~30th years. However, beyond approximately 30 years, the strength decreases, and the dispersion also increases. The strength of concrete in a marine environment exhibits an initial rapid increase followed by a gradual deceleration within approximately 5 years, eventually leading to an attenuation in strength after this period. The corrosion of concrete in marine environments is more severe than that in general atmospheric conditions. The time-varying fitting curves of concrete strength in both general atmospheric and marine environments can be categorized into increase and attenuation periods, which can be accurately modeled and expressed using the Log3P1 (y = a − b ln (x + c)) function.