水胶比对水泥固化放射性废树脂的影响

Effect of Water/Binder Ratio on Cementation of Radioactive Spent Resin

采用硫铝酸盐水泥固化模拟放射性废树脂,研究水胶比对浆料流动度、凝结时间和固化体抗压强度的影响,同时探讨萘系减水剂UNF-5的作用。研究结果表明:水胶比由0.25增至0.35时,流动度呈线性增加,由228mm增至280mm;凝结时间延长,初凝和终凝时间分别由3.0h和9.3h延长到4.6h和10.4h;抗压强度呈线性降低,28d抗压强度由19.8MPa降至13.5MPa。UNF-5掺量增加时,流动度呈线性增加,凝结时间先缩短后延长,抗压强度先增加后降低。当UNF-5掺量为0.05%～0.10%时,流动度为200～225mm,初凝时间为3～4h、终凝时间为11～12h,28d抗压强度为21.1～21.7MPa。

Simulated radioactive spent resins were solidified by sulfoaluminate cement, and the influence of water/binder ratio and the blending amount of naphthalene-based water reducer UNF-5 on fluidity, setting times and compressive strength of waste forms were investigated. With water/binder ratio increasing from 0.25 to 0.35, the fluidity enhances linearly from 228 mm to 280 mm. The initial and final setting time prolong from 3.0 h and 9.3 h to 4.6 h and 10.4 h, respectively. The 28 d compressive strength decreases linearly from 19.8 MPa to 13.5 MPa. When the blending amount of UNF-5 increases, the fluidity increases, the setting time decreases initially and then increases, and the compressive strength increases to the maximum and then decreases. With UNF-5 blending amount of 0.05%-0.10%, the fluidity is 200-225 mm, the initial and final setting time are 3-4 h and 11-12 h, respectively, and the 28 d compressive strength is 21.1-21.7 MPa.