重晶石防辐射泵送混凝土的试验研究与工程应用

Experiment research and engineering application of barite anti-radiation pump concrete

重晶石防辐射混凝土因浆骨密度差异大，容易出现离析、分层等现象，这不仅使其工作性能不容易满足泵送施工要求，而且其密实性、匀质性也受到影响，二者矛盾较难统一。成都某核动力研究所重晶石防辐射混凝土项目，要求采用密度≥3600kg/m^3的c25重晶石防辐射混凝土进行泵送施工，在成都地区尚属首例。针对该项目开展重晶石防辐射泵送混凝土试验研究，通过精选重晶石矿，提高胶凝材料用量等途径，解决重晶石防辐射混凝土表观密度、工作性能等问题，成功配制出密度〉3600kg/m^3，坍落度220-240mm，扩展度580-620mm，工作性能良好的C25重晶石防辐射混凝土，并成功采用泵送方式完成施工。

Barite anti-radiation concrete was easy to segregation and delamination because of the differences between slurry and aggregates, it made not only the workability of barite concrete can not meet the pumping construction requirements,but also the compactibility and homogenity of concrete was affected, the conflicts between them was difficult to unity.One barite concrete project for a nuclear power in Chengdu required using C25 barite concrete with apparent density more than 3 600 kg/m3 for pumping construction,it was the first case in Chengdu.The barite anti-radiation pump concrete according to this project was studied,problem of barite concrete＇s apparent density and workability was solved by the selection of barite ore, increase the cementitious materials content and other way, C25 barite concrete was successfully developed, this concrete with apparent density more than 3 600 kg/m3, slump of it was 220-240 mm, slump flow of it was 580-620 mm and with good performance, and successfully accomplished by pumping construction method.