内养护作用下混凝土耐久性研究进展

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中图分类号：TU528.064 文献标志码：A 文章编号：2096-6717（2025）06-0193-14

Abstract： Concrete has exceptional mechanical properties and durability.Nevertheless，conventional curing methods are ineffective in addressing the issues of autogenous shrinkage and cracking during its early stages. Internal curing technology can eectively enhance the internal moisture distribution of concrete，mitigate shrinkage cracking，and improve its durability.This paper investigates the internal curing mechanism of concrete and analyzes its influence on the durabilityofconcrete.Incorporating pre-wetted lightweight aggregates or super-absorbent polymers into concrete releases water，as the moisture surounding the aggregates decreases. This process fils the unsaturated pores in the concrete and increases the meniscus radius of the pore solution， thereby achieving internal curing. Internal curing promotes cement hydration around the aggregates，improves the compactness of the interfacial transition zone，aleviates concrete cracking caused by self-desiccation，and enhances cracking resistance.Moreover，it obstructs the transmision path of corrosive media，improves concrete permeability，and enhances corrosion resistance against ions，gases，and other corrosive agents. After Water release，the internal curing materials create a substantial number of pores within the concrete.These pores aid in releasing the expansion pressure resulting from the freezing of the concrete pore solution，thereby improving frost resistance.Additionally，the pores of lightweight aggregates provide space for the deposition of expansive gel， thereby reducing the occurrence of alkali-aggregate reaction.

Keywords： internal curing；interfacial transition zone；corosive media；environmental effects；cracking resistance；concrete durability

混凝土强度高、尺寸稳定性好，且具备优良的抗渗性与耐久性，造价相对低廉，因此在现代土木工程结构中得到广泛应用。（剩余29437字）