Preparation of admixture by lightly calcinated electronic fluorine-containing sludge mixed with coal gangue and its effect on cement properties
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摘要: 直接轻烧电子含氟污泥用作水泥混合材存在火山灰活性不高、标准稠度需水量大等问题,本文利用煤矸石作为电子含氟污泥的硅铝质补充来源,将电子含氟污泥和煤矸石混合后轻烧制备水泥混合材,通过强度活性指数、水泥力学强度、水泥标准稠度需水量、凝结时间、粒度分布等指标以及X射线衍射和扫描电镜等试验,探究了轻烧煤矸石混合电子含氟污泥制备水泥混合材对水泥性能的影响。结果表明:与直接轻烧电子含氟污泥制备的水泥混合材相比,煤矸石混合电子含氟污泥后轻烧制备的水泥混合材,可改善水泥的颗粒级配,降低水泥的标准稠度需水量,提高水泥混合材的活性和所配制普通硅酸盐水泥强度,但会使水泥的初凝时间延长、终凝时间缩短。Abstract: In view of the problems posed by low pozzolanic activity and large water requirement of normal consistency in the direct light calcinating of electronic fluorine-containing sludge as cement admixture, this paper uses coal gangue as a supplementary silicon and aluminum source of electronic fluorine-containing sludge to mix electronic fluorine-containing sludge and coal gangue and then to prepare cement admixture by light calcinating. This paper studied the effect of cement admixture prepared by light calcinating electronic fluorine-containing mixed with sludge coal gangue on cement properties through strength activity index, mechanical properties of cement, water requirement of normal consistency, setting time, particle size, X-ray diffraction and scanning electron microscopy. The results show that compared with direct light calcinating of electronic fluorine-containing sludge to prepare cement admixture, light calcinating of electronic fluorine-containing sludge mixed with coal gangue can improve the particle gradation of cement and reduce the water requirement of normal consistency of cement. It can significantly improve the activity of cement admixture and the strength of ordinary portland cement. Significantly extending the initial setting time and shorten the final setting time of cement.
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表 1 EFS、CC、CG和GP的化学组成
Table 1. Chemical compositions of EFS, CC, CG and GP
% Oxide SiO2 Al2O3 CaO Fe2O3 MgO SO3 K2O P2O5 F L. O. I Others CC 22.81 5.49 63.79 3.36 1.52 0.30 1.12 0.09 0.02 0.80 0.70 EFS 8.99 6.52 34.76 3.21 2.43 1.82 0.09 9.64 15.63 15.72 1.19 CG 50.29 19.75 3.81 3.98 0.74 2.91 1.94 0.08 — 15.60 0.90 GP 1.48 0.51 50.12 0.30 0.36 43.67 0.08 0.02 — — 3.46 表 2 掺加不同水泥混合材的水泥配方
Table 2. Proportion of cement with different cement admixtures
水泥种类 轻烧温度/℃ wEFS/% wCG/% wCC/% wGP/% 对照组 — 0 0 95 5 S0-1 105 20 0 75 5 S0-2 14 6 75 5 S6-1 600 20 0 75 5 S6-2 14 6 75 5 S7-1 700 20 0 75 5 S7-2 14 6 75 5 S8-1 800 20 0 75 5 S8-2 14 6 75 5 表 3 掺加不同混合材水泥的标准稠度需水量
Table 3. Water requirement of normal consistency of the cement with different admixtures addition
水泥种类 轻烧温度/℃ 标准稠度需水量/% 对照组 — 28.6 S0-1 105 46.2 S0-2 45.4 S6-1 600 33.9 S6-2 32.5 S7-1 700 32.5 S7-2 31.9 S8-1 800 32.3 S8-2 30.5 表 4 掺加不同混合材水泥的凝结时间
Table 4. Setting time of the cement with different admixtures addition
水泥种类 轻烧温度/℃ 凝结时间/min 初凝 终凝 对照组 — 100 190 S0-1 105 7 10 S0-2 8 12 S6-1 600 80 270 S6-2 100 240 S7-1 700 75 238 S7-2 85 215 S8-1 800 55 208 S8-2 83 195 表 5 掺加不同混合材水泥的等效粒径
Table 5. Equivalent particle size of cement added with different admixtures
水泥种类 D10/μm D50/μm D90/μm 离散度 对照组 2.400 13.913 43.355 2.94 S8-1 1.727 9.868 45.417 4.43 S8-2 1.965 11.234 44.562 3.79 -
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