大体积混凝土水化热引发的温度应力裂缝是特高压变电站工程的关键技术瓶颈。以典型特高压输变电站大体积混凝土为研究对象，通过水化热试验，系统探究粉煤灰、矿渣与抑制剂组合对水泥复合体系水化热的影响机制，并提出协同调控方案。结果表明：矿渣粉、粉煤灰及抑制剂的掺入可显著延长水泥水化加速起始期，降低水化放热量。其中，酒石酸-粉煤灰组合效果最显著，水化温峰降幅达97.4%，远超传统材料的控温水平（水化温峰降幅在30%~50%之间）；抑制剂-矿物掺合料-通水冷却协同调控体系，可将温度梯度稳定降至8.5 ℃/m以下，也优于现有传统温控指标。研究成果为大体积混凝土低水化热配方设计提供了核心参数，对解决特高压变电站施工的温度调控及其诱发的温度裂缝问题具有重要指导意义。

[Objective] Cracks induced by hydration heat and associated temperature stress in mass concrete present a critical technical challenge in ultra-high voltage （UHV） substations. Focusing on typical mass concrete for UHV projects， this study systematically investigates the mechanisms by which the combination of fly ash， slag， and inhibitors affects the hydration heat of cementitious composite systems. [Methods] Using typical mass concrete as a case study， a series of hydration heat tests were conducted to investigate the influence of a composite system incorporating fly ash， slag， and inhibitors on the hydration heat of cement. Based on these experiments， a rational control strategy is proposed. [Results] Incorporating slag powder， fly ash， and inhibitors significantly delays the onset of the accelerated hydration phase and reduces total hydration heat. The inhibitory effect of citric acid exhibits a positive correlation with the dosage of mineral admixtures； specifically， citric acid primarily extends the peak time at lower admixture levels， whereas it induces complete process inhibition at higher concentrations. Nano-zinc oxide effectively mitigates early-stage hydration exothermicity； however， rapid subsequent reactions （exceeding 100 hours） may cause thermal stress concentration within cement-based materials， thereby accelerating the risk of cracking. Consequently， zinc oxide is not recommended for controlling hydration temperatures in mass concrete applications. Furthermore， the synergistic use of slag powder， fly ash， and inhibitors influences nucleation and crystal growth during hydration， resulting in an increase in kinetic parameters while simultaneously reducing hydration rates across all stages （evidenced by decreasing K_NG， K_I， and K_D）. Notably， the combination of tartaric acid and fly ash demonstrates the most pronounced effect， achieving a 97.4% reduction in the peak hydration temperature， which is far superior to the 30% to 50% efficiency of conventional material-based temperature control. Additionally， the control system combining inhibitors， mineral admixtures， and water cooling effectively reduces the temperature gradient to below 8.5℃/m， a performance significantly better than traditional temperature control indices. [Conclusions] The type and dosage of retarders should be determined comprehensively during the construction phase of mass concrete， considering their effects on workability， mechanical properties， and durability. From an economic perspective， although the cost of using tartaric acid is slightly higher than that of traditional methods， its remarkable effectiveness at low dosages significantly mitigates cracking， reduces subsequent maintenance costs， and enhances overall economic efficiency. Therefore， these achievements provide scientific support for mix proportion design and temperature control strategy optimization， offering practical guidance for temperature regulation and crack prevention during the construction of UHV substations.