Abstract
Chemical resistance of the cement mortar containing the Thermally Activated Diaomite(TAD) and H.M.(Heavy Metals) has been studied. The H.M.. extracted from EAF(Electrica1 Arc Furnace) Dust. were saturated with diatomite. The diatomite was then thermally activated at $750{\circ}C$ for 30minutes and powdeled. The powder was mixed with a portland cement on a weight basis from 0%. 2.5%. 5.0%. 10%. 20%. The optimum mixture. after those mixtures were subjected to compressive strength(7 and 28days) and leaching bchaviour of H.M.. was tested for its experiment on Wet/Dry cycles and chemical resistance(e.q. imrncrsion in 5%(Conc.) of H2S04, CaC12 and hlgSO4. It was shown that the cement, mortar containing 10% of' P.D. gave a rise to the remarkable increase in compressive strength. The compressive strength was generally decrease beyond the addition of 10% of P.D. The maximum $496kgf/cm^2$ of 28days compressive strength was acheiveti when 10% of P.D. was added to the cement mortar.
전기로 집진 분진상의 중금속(Pb, $Cr^{6+}$, Cu, Cd, Zn)을 함침시킨 규조토를 열처리방법($750^{\circ}C$-30분)으로 활성화하였다. 활성규조토로 일반시멘트 모르터의 시멘트양을 중량비로 0%, 2.5%, 5.0%, 10%, 20%까지 대체하고 압축강도와 화학저항성을 조사하였다. 화학저항성 조사에는 습윤건조반복실험(Wetting /Drying Cycle)과 화학침식저항성($H_2SO_4,\; CaCl_2,\; MgSO_4$)이 포함되었다. 결과에 의하면 일반시멘트 모르터에 활성규조토를 시멘트에 10%까지 치환하여 갈수록 압축강도(28일)는 증가하였다. 최고의 압축강도는 활성규조토가 10%까지 치환하였을 때 $496kgf/cm^2$이었으며, 활성규조토가 전혀 혼합되지 아니한 시멘트 모르터의 압축강도($391kgf/cm^2$)보다 약 275까지 증가되었다. 이때 중금속들은 99% 이상의 고정율을 보였으며 Wet/Dry cycle 및 화학침식저항성에서도 활성규조토가 혼합된 시멘트 모르터가 일반 시멘트 모르터보다 훨씬 높은 저항성을 보였다.
