CAJ | 학술논문

文章采用准静态试验研究了玄武岩纤维水泥胶砂 F-δ曲线，发现曲线并没有明显的初裂点，且应力软化阶段非常短，常用的国内外混凝土韧性评价标准不适用于低掺量玄武岩水泥胶砂的韧性评价；借鉴挪威NBP No ．7标准，取水泥胶砂加载试验中峰值荷载前后各0.10 mm对应的强度来进行韧性评价，发现随着玄武岩纤维掺量的增加，水泥胶砂开裂前后0.10 m m挠度处的强度不断增加，说明纤维水泥胶砂具备了一定的开裂后继续承载的能力；通过动态疲劳试验研究了4种应力水平下的玄武岩纤维水泥胶砂的疲劳寿命，并在Weibull概率分布条件下拟合了lg S-lg N曲线，试验表明，一定体积掺量的玄武岩纤维可大幅提高水泥胶砂的疲劳性能，但纤维掺量过高会导致疲劳寿命变异较大；以疲劳方程为依据，计算了纤维水泥胶砂的强度强化系数 CI，此系数可一定程度上反映材料的韧性。
문장채용준정태시험연구료현무암섬유수니효사 F-δ곡선，발현곡선병몰유명현적초렬점，차응력연화계단비상단，상용적국내외혼응토인성평개표준불괄용우저참량현무암수니효사적인성평개；차감나위NBP No ．7표준，취수니효사가재시험중봉치하재전후각0.10 mm대응적강도래진행인성평개，발현수착현무암섬유참량적증가，수니효사개렬전후0.10 m m뇨도처적강도불단증가，설명섬유수니효사구비료일정적개렬후계속승재적능력；통과동태피로시험연구료4충응력수평하적현무암섬유수니효사적피로수명，병재Weibull개솔분포조건하의합료lg S-lg N곡선，시험표명，일정체적참량적현무암섬유가대폭제고수니효사적피로성능，단섬유참량과고회도치피로수명변이교대；이피로방정위의거，계산료섬유수니효사적강도강화계수 CI，차계수가일정정도상반영재료적인성。
The F-δcurves of basalt fiber reinforced cement mortar were researched by quasi-static tests , no obvious first crack point was found ,and the period of stress softening was very short ,so the com-monly used evaluation methods of concrete toughness home and abroad were improper for low-volume basalt fiber reinforced cement mortar .Taking the specification BP No .7 of Norway for reference and choosing the flexural strength before and after the crack point with 0.10 mm deflection as the tough-ness index ,it was found that the flexural strength before and after the crack point with 0.10 mm de-flection increased as the volume fraction of basalt fiber increased ,w hich indicated that basalt fiber re-inforced cement mortar still possessed certain bearing capacity after cracking .The fatigue life of basalt fiber reinforced cement mortar under four grades of stress level was researched by dynamic fatigue ex-periment .And the lg S-lg N curves were fitted by using Weibull probability distribution .The results showed that certain volume fraction of basalt fiber could signally improve the fatigue performance of cement mortar .However ,too large volume fraction of basalt fiber might lead to large variation of fa-tigue life .According to fatigue equation ,the intensifying coefficient of cement mortar CI was calculat-ed ,w hich could fairly reflect the toughness of material .