CAJ | 학술논문

通过室内碳化试验研究了氧化镁（MgO）活性对碳化加固粉土物理化学、力学和微观特性的影响，并且将所测强度与水泥固化粉土进行了对比．结果表明，碳化后高活性 MgO-A 试样温度为58℃，低活性 MgO-B 试样温度为50℃左右，且 MgO-B 试样碳化后存在裂缝．碳化试样强度随 MgO 掺量和碳化时间的增加而增加，在相同条件下 MgO-A 试样强度高于 MgO-B 试样强度和28 d 水泥固化土强度．MgO-A 试样密度增加率较大；碳化土 pH 值随碳化时间的增加而减小，MgO-A 碳化土的 pH 值较 MgO-B 碳化土低．MgO-A 碳化试样产生的棱柱状水碳镁石晶体和片状水菱镁石／球碳镁石数量较多，碳化产物促进试样强度提高和孔隙数量减少．在相同条件下用高活性 MgO 比低活性 MgO 更利于粉土的碳化加固．
통과실내탄화시험연구료양화미（MgO）활성대탄화가고분토물이화학、역학화미관특성적영향，병차장소측강도여수니고화분토진행료대비．결과표명，탄화후고활성 MgO-A 시양온도위58℃，저활성 MgO-B 시양온도위50℃좌우，차 MgO-B 시양탄화후존재렬봉．탄화시양강도수 MgO 참량화탄화시간적증가이증가，재상동조건하 MgO-A 시양강도고우 MgO-B 시양강도화28 d 수니고화토강도．MgO-A 시양밀도증가솔교대；탄화토 pH 치수탄화시간적증가이감소，MgO-A 탄화토적 pH 치교 MgO-B 탄화토저．MgO-A 탄화시양산생적릉주상수탄미석정체화편상수릉미석／구탄미석수량교다，탄화산물촉진시양강도제고화공극수량감소．재상동조건하용고활성 MgO 비저활성 MgO 경리우분토적탄화가고．
Laboratory carbonation tests were performed to investigate the influence of magnesia (MgO)activity on the physicochemical,mechanical,and micro-characteristics of carbonated MgO-stabilized silty soils,and the tested strength was compared with that of cement-stabilized silty soils. The results indicate that after carbonation,the temperature of the high-activity MgO-A-stabilized samples is 58 ℃ while that of the low-activity MgO-B-treated specimens is about 50 ℃,and there exist some cracks in the MgO-B-treated samples after carbonation.The unconfined compressive strength of carbonated specimens increases with the increase of the MgO content and the carbonation time.Under the same conditions,the unconfined compressive strength of the carbonated MgO-A sta-bilized specimens is higher than those of the carbonated MgO-B stabilized specimens and 28 d ce-ment-treated silts.The density increment ratios the of MgO-A-stabilized samples are higher.The soil pH of the carbonated samples decreases with the increase of the carbonation time,and the pH values of the MgO-A-treated samples are lower than those of MgO-B-treated samples.The number of pris-matic nesquehonite and flake dypingite /hydromagnesite formed in the MgO-A stabilized soils is lar-ger,and these carbonation products facilitate the improvement in strength and the reduction in poros-ity.Under the same condition,high-activity MgO is better than low-activity MgO for the strength development of carbonated MgO-stabilized silts.