王祥，郭培玺，谢东武

摘要：为了保证严寒地区建筑结构的冻融安全性，对水灰比（W/C）为47%的粒化高炉矿渣混合再生骨料混凝土进行研究，通过多组试验对混合混凝土的泌水性、抗压强度等进行评估，分析混合粒化高炉矿渣的再生骨料混凝土的抗冻融性。结果表明：1）当粒化高炉矿渣掺量小于50%时，其泌水性可保持在0.1 cm3/cm2以下;2）在混凝土的空隙通过性试验中，掺入粒化高炉矿渣后，混凝土的间隙通过性突出，抗压强度低于普通混凝土，但具有足够的抗冻融性能;3）在配合比设计为正常强度范围的混凝土中，利用粒化高炉矿渣取代50%以下的碎砂的再生骨料混凝土具有足够的泌水性、抗压强度，以及抗冻融性能。混合粒化高炉矿渣的再生骨料混凝土可用于在高寒地区进行的工程建设，研究成果可有效提高高寒地区建筑物的抗冻融性并延长其使用寿命，可为高寒地区工程项目中抗冻融混凝土的制备提供一定的参考。

关键词：混凝土与钢筋混凝土结构;再生骨料;粒化高炉矿渣;泌水性;抗冻融性

中图分类号：TU411.7文献标识码：ADOI： 10.7535/hbgykj.2021yx05002

Research on freeze-thaw resistance of recycled concrete with

granulated blast furnace slag

WANG Xiang1，GUO Peixi2，XIE Dongwu3

（1.Sichuan-Tibet Railway Company Limited，Chengdu，Sichuan 610094，China;2.Shaanxi Key Laboratory of Safety and Durability of Concrete Structures，Xi′an，Shaanxi 710123，China;3.College of Civil Engineering，Tongji University，Shanghai 200092，China）

Abstract：In order to ensure the structural freeze-thaw safety of buildings in severe cold areas，the granulated blast furnace slag mixed recycled aggregate concrete with a W/C （water-cement ratio） of 47% was studied.Through multiple sets of tests，the bleeding and compressive strength of the mixed concrete were evaluated，and the freeze-thaw resistance of recycled aggregate concrete mixed with granulated blast furnace slag was analyzed.The results show that：1） when the granulated blast furnace slag content is less than 50%，its bleeding can be kept below 0.1 cm3/cm2;2） in the filling performance test of concrete，after adding granulated blast furnace slag，the interstitial passability of the concrete is outstanding，the compressive strength is lower than that of ordinary concrete，but it has sufficient freeze-thaw resistance;3） when the mix ratio of concrete is designed in the normal strength range，granulated blast furnace slag is used to replace the broken sand（ less than 50%），which has sufficient performance of bleeding，compressive strength，and freeze-thaw resistance.Recycled aggregate concrete mixed with granulated blast furnace slag can be used for engineering construction in high-cold areas，the results can effectively improve the freeze-thaw resistance of the building in high-cold areas and extend its service life，which also provide a certain reference for the preparation of freeze-thaw-resistant concrete in high-cold areas.

Keywords：concrete and reinforced concrete structures;recycled aggregate;granulated blast-furnace slag;bleeding;freeze-thaw resistance

隨着工程建设的快速发展，对混凝土骨料的需求量日趋增大，天然骨料开发难以满足工程需求，同时过度开发也会带来对生态环境的严重破坏。当前工程上主要采用粉煤灰（FA）[1-2]、高炉矿渣（GGBS）[3]、再生细骨料（RFA）[4]等混合制备混凝土。相关研究显示，粉煤灰可以改变混凝土的可加工性能和耐久性能[5-6]，高炉矿渣可以降低间隙率并提高混凝土的耐腐蚀性[7-8]。……