CAJ | 학술논문

对掺入钢纤维的喷射混凝土、掺入聚丙烯纤维和钢纤维的复合纤维喷射混凝土和普通素混凝土三种喷射混凝土进行快速碳化试验，建立了基于试验的碳化深度预测计算式，该计算式有碳化速度系数和初始碳化难易程度两个常数，经对比与实际吻合良好。试验结果表明：在喷射混凝土中掺入纤维可以有效改善喷射混凝土的抗碳化性能。在配合比相同及纤维掺量适宜的条件下，其抗碳化性：复合纤维喷射混凝土>钢纤维喷射混凝土>普通喷射混凝土。在考虑了自然环境与试验环境的主要区别的基础之上，提出了基于试验的自然环境下纤维喷射混凝土碳化深度的预测模型。由于纤维喷射混凝土实际工程测试数据缺乏，该模型尚需实际检验与修正。
대참입강섬유적분사혼응토、참입취병희섬유화강섬유적복합섬유분사혼응토화보통소혼응토삼충분사혼응토진행쾌속탄화시험，건립료기우시험적탄화심도예측계산식，해계산식유탄화속도계수화초시탄화난역정도량개상수，경대비여실제문합량호。시험결과표명：재분사혼응토중참입섬유가이유효개선분사혼응토적항탄화성능。재배합비상동급섬유참량괄의적조건하，기항탄화성：복합섬유분사혼응토>강섬유분사혼응토>보통분사혼응토。재고필료자연배경여시험배경적주요구별적기출지상，제출료기우시험적자연배경하섬유분사혼응토탄화심도적예측모형。유우섬유분사혼응토실제공정측시수거결핍，해모형상수실제검험여수정。
Three different shot concretes were texted in the accelerated carbonation experiment.They were steel fiber shot concrete, steel-polypropylene composite shot concrete,and common shot concrete.Carbonation depth prediction formula was estab lished based on the experiment.Calculation results showed a good agreement with the experimental ones.Experiment results showed that the fiber shot con-crete can improve carbonation resistance property effectively.Under the same mix proportion with a suitable fiber fraction amount,carbona-tion resistance property:steel-polypropylene composite shot concrete>steel fiber shot concrete>common shotcrete.The natural carbonation depth prediction model based on experiment was established by analyzing the differences between the natural carbonation and accelerated carbonation.Due to the lack of actual engineering test datum of the fiber reinforced shot concrete,this model still need to be texted and cor-rected according to the actual conditions.