CAJ | 학술논문

针对超高强混凝土水胶比小、自收缩大等特点，研究了不同膨胀源膨胀剂和多孔掺合料对超高强混凝土工作性能、力学性能和自收缩性能的影响。结果表明，膨胀源为MgO的BTMG膨胀剂水化较慢，反应耗水少，晶体膨胀能大，掺BTMG超高强混凝土早期（3d）膨胀效果不明显，后期具有持续膨胀效果。预吸水的稻壳灰（RHA）和沸石粉（NZ）均能在养护后期释放水分，缓解混凝土内部湿度的降低，一定程度上弥补了混凝土自收缩，但RHA活性较NZ高，孔结构更为丰富，配制的超高强混凝土工作性能和强度损失小；BTMG与RHA复合后使用可将二者优势互补，提高混凝土体积稳定性和后期强度。
침대초고강혼응토수효비소、자수축대등특점，연구료불동팽창원팽창제화다공참합료대초고강혼응토공작성능、역학성능화자수축성능적영향。결과표명，팽창원위MgO적BTMG팽창제수화교만，반응모수소，정체팽창능대，참BTMG초고강혼응토조기（3d）팽창효과불명현，후기구유지속팽창효과。예흡수적도각회（RHA）화비석분（NZ）균능재양호후기석방수분，완해혼응토내부습도적강저，일정정도상미보료혼응토자수축，단RHA활성교NZ고，공결구경위봉부，배제적초고강혼응토공작성능화강도손실소；BTMG여RHA복합후사용가장이자우세호보，제고혼응토체적은정성화후기강도。
As with low water-binder ratio and high autogenous shrinkage of ultra-high strength concrete (UHSC), in-fluence of expansive agent with different expansion sources and porous mineral admixture on workability, mechanical properties and autogenous shrinkage of UHSC were studied. Results showed that the hydration rate of expansive agent with expansion sources of MgO was slower and hydration process needed littler water than other expansive agents, which result-ed in BTMG had little effect on shrinkage-compensation of UHSC at early age, and much useful effect at later age. Inside water of pre-wet rice husk ash (RHA) and natural zeolite (NZ) would be released along with curing age, which improved volume stability of UHSC because the inside humidity of UHSC increased. The pozzolanic activity of RHA was higher and pore structures diversed more than NZ, making UHSC with better workability and compressive strength. Under the com-pound use of BTMG and RHA, UHSC got high volume stability and compressive strength with stack effect.