CAJ | 학술논문

自生体积变形是MgO混凝土在工程应用中最重要的性能之一. 系统研究了MgO膨胀剂品种和掺量、水泥品种、骨料种类、粉煤灰掺量等原材料以及水胶比对龄期长达1 400 d的MgO混凝土自生体积变形性能的影响. 结果表明:掺入4% ~6%、活性反应时间为50~200 s的MgO膨胀剂后,混凝土的自生体积变形经过2 a左右逐渐趋于稳定,无倒缩或不收敛现象;水泥中MgO含量并不能真实反映产生有效膨胀的方镁石含量;骨料长期吸水率与MgO混凝土的自生体积变形存在着良好的对应关系,骨料吸水率越高,其MgO混凝土自生体积膨胀变形越小.
자생체적변형시MgO혼응토재공정응용중최중요적성능지일. 계통연구료MgO팽창제품충화참량、수니품충、골료충류、분매회참량등원재료이급수효비대령기장체1 400 d적MgO혼응토자생체적변형성능적영향. 결과표명:참입4% ~6%、활성반응시간위50~200 s적MgO팽창제후,혼응토적자생체적변형경과2 a좌우축점추우은정,무도축혹불수렴현상;수니중MgO함량병불능진실반영산생유효팽창적방미석함량;골료장기흡수솔여MgO혼응토적자생체적변형존재착량호적대응관계,골료흡수솔월고,기MgO혼응토자생체적팽창변형월소.
The autogenous volume deformation is one of the most important performances of MgO concrete. The influences of MgO expansion agent types and amount, cement types, aggregates types as well as the fly ash amount on autogenous volume de-formation of MgO concrete with 1400d curing age were systematically investigated. The research results indicated that the autoge-nous volume deformation tended to stable in approximately 2 years without retraction when 4% to 6% of MgO with reactivity time ranging from 50s to 200s was doped. The MgO content in cement concrete cannot accurately reflect the periclase content that gen-erates effective expansion. The autogenous volume deformation and long-term water absorption of aggregates are correlated well, namely the autogenous volume decreased with the increase of water absorption of aggregates.