改性低活性粉煤灰替代水泥膠結(jié)地下尾砂的研究

打開文本圖片集

中圖分類號(hào)：TU521.4 文獻(xiàn)標(biāo)志碼：A 文章編號(hào)：1005-8249（2025）02-0006-05

Abstract：Flyashisoftenusedasanadmixtureincementorconcrete，butlow-calciumflyashisunderutiliseddueto itslow activity.Low-calciumflyash wasmodifiedbymechanicalandchemicalcombinationmethodstostudytheefectonthe compresive strengthof themodifiedflyashafterreplacing partof theundergroundfllingcement.Theresultsshowthat：when theflyasisactivated，replacingpartoftecementcansigficantlyimproveitscompresivestrength；withteamountofflyash substitution increased from 2 1 . 5 % to 4 6 . 3 % ，thecompressive strength of the specimens of the modified low activity fly ash substitutioncementcementcementiousmaterialsgraduallyincreased，andthemaximumcompressivestrength wasachievedat the substitution of 2 8 . 2 % ；when the amount of cement substitution was 2 8 . 2 % ，and the ratio of glue and sand was 1 ： 4 ，the compressive strength reached ，which is the same as that of cement cementitious end sands under the same conditions. It is1.56timesofthecompresivestrengthofcementcementedsandunderthesameconditions.Aftercalculatingthecost，it can be seen that fly ash replaces 2 8 . 2 % of the cement dosage and saves 2 8 . 7 % of the cost，which has good economic benefits. Keywords：low-activityflyash；modification；substitution；ordinary Portland cement；underground cementing tailings

0 引言

許多礦山使用水泥作為尾砂膠結(jié)充填的膠結(jié)劑，每年需消耗數(shù)以萬(wàn)噸的水泥。（剩余5830字）