Effect of Diatomite on Properties of Cement- Copper Tailing Powder Cementitious Materials
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摘要:
针对铜尾矿粉-硅酸盐水泥力学强度差的问题，本文拟将硅藻土加入到该胶凝体系中，硅藻土以0.5%，1.0%，1.5%和2.0%等质量替代铜尾矿粉-水泥，测试了复合胶凝材料的流动度、凝结时间、吸水率、孔隙率、体积密度、力学性能和微观性能。结果表明，随着硅藻土掺量的增加，净浆的流动度降低，凝结时间缩短，吸水率和孔隙率减小，体积密度增大，砂浆的抗压强度和抗折强度增加。净浆养护28 d后，硅藻土的加入使得净浆中的SiO2和Ca(OH)2晶体含量减少，C-S-H(水化硅酸钙)凝胶增多，整体比较致密。
Abstract:To overcome the poor mechanical strength of copper tailing powders- Portland cement, diatomite was added into this cementitious system.Diatomite replaced the copper tailing powders- Portland cement with 0.5%, 1.0%, 1.5% and 2.0% in weight.The fluidity, setting time, water absorption, porosity, bulk density, mechanical properties and microscopic properties of the composite cement materials were tested. The results showed that with the increase of the dosage of diatomite, the fluidities of the pastes decrease, the setting time shortens, water absorptions and porosities decrease, bulk densities increase, compressive strength and flexural strength of the mortars increase. After curing for 28 days, the addition of diatomite makes the SiO2 and Ca(OH)2 content in the hydration products decrease, the C-S-H (Calcium Silicate Hydrate) gels increase, and the whole is denser.
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Key words:
- Diatomite /
- Copper tailing powder /
- Portland cement /
- Cementitious material /
- Mechanical strength
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表 1 水泥、铜尾矿和硅藻土的化学组成/%
Table 1. Chemical composition of cement, copper tailing powder and diatomite
名称 SiO2 CaO Al2O3 Fe2O3 SO3 MgO P2O5 Na2O K2O LOI 水泥 20.87 62.66 4.14 5.12 2.32 4.08 0.08 0.11 0.28 0.34 铜尾矿 3.56 63.84 19.65 2.37 0.36 3.16 0.15 0.30 4.67 1.94 硅藻土 78.24 1.06 0.55 1.12 0.98 0.87 0.25 0.89 0.75 15.29 
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表 2 硅藻土-铜尾矿粉-水泥净浆的组成设计
Table 2. Composition design of diatomite- copper tailing powder- cement pastes
样品 水泥/g 铜尾矿粉/g 硅藻土/g 自来水/g CT 840 360 - 420 CTD0.5 835.8 358.2 6 420 CTD1.0 831.6 356.4 12 420 CTD1.5 827.4 354.6 18 420 CTD2.0 823.2 352.8 24 420
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