Abstract: Research on early strengthening agent has mainly focused on the changes of hydration rate, product and liquid-phase ions in the early stage of strength development of cement-based materials. However, a systematic summary of its mechanism and effects is lacking. In this paper, therefore, the early strengthening mechanisms of three types of early strengthening agents (inorganic, organic and composite) and their functions in each hydration stage are reviewed. The following conclusions are summarized. The inorganic early strengthening agents destroy hydration-blocking film or liquid dissociation equilibrium by increasing the alkalinity of the system, compressing the double layer, and providing a crystal nucleus to reduce the nucleation barrier, so as to accelerate the dissociation rate during the dissociation period and increase the ion concentration in the liquid phase. Furthermore, the early strength will be improved during the induction period by accelerating the formation of ettringite or calcium alumina hydrotalcite, and by improving the volume content of the early strengthening solid phase and the density of the system through the consumption of hydration products and the destruction of the equilibrium of the hydration reaction. Organic early strengthening agents mainly promote the dissociation rate through dispersion or destroy the reaction equilibrium through complexation and hydration. The dosage, however, affects the early strength and setting rate. Compound early strengthening agents coordinate multiple mechanisms to accelerate the ove-rall hydration process, but more attention should be paid to avoiding the formation of new products which will the normal hydration process of the original active components. As the following suggestions proposed, the selection of early strengthening agents should match the binder and coordinate the early strengthening mechanism to promote the strength development of each hydration stage. To meet the demand of high early strength as early as possible, sulfuric acid and silicate are selected as anions, Ca2+ and Al3+ as cations, or Li+with higher active ingredients and no durability hazard. The dispersion and complexation of the organic early strengthening agent should be considered; however, more attention should be paid to the corresponding thresholds of rapid setting and retarding setting and to avoidance of the reduction of long-term performance.
庞超明, 唐志远, 杨志远, 黄鹏. 水泥基材料中的早强剂及其作用机理综述[J]. 材料导报, 2023, 37(9): 21110247-11.
PANG Chaoming, TANG Zhiyuan, YANG Zhiyuan, HUANG Peng. Early Strengthening Agent in Cementitious Composites and Its Function Mechanism: a Review. Materials Reports, 2023, 37(9): 21110247-11.
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