Hydration Characteristics of Excess-sulfate Titanium Gypsum Slag Cement
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摘要:
这是一篇矿物材料领域的论文。借鉴工业副产石膏与矿渣复合制备胶凝材料的经验，设计了若干组过硫钛石膏矿渣水泥，对该水泥的标准稠度用水量、凝结时间、力学性能和耐水性进行了研究，并对水化产物进行了XRD和SEM分析。结果表明，钛石膏会增大标准稠度用水量，并延长凝结时间，对力学性能和耐水性均有不利影响。通过适当增加熟料掺量可以弥补钛石膏的不利影响，当熟料掺量达到25%时，复合胶凝材料的28 d抗压强度达到30 MPa。在钛石膏和熟料掺量较高的实验组中，水化产物主要以钙矾石和水化硅（铝）酸钙为主，而矿渣掺量较高和熟料掺量较低的实验组中，水化产物主要是无定形水化硅（铝）酸钙。
Abstract:This is an article in the field of mineral materials. Based on the experience of cementing materials composited with industrial by-product gypsum and slag , several sets of excess-sulfate titanium gypsum slag cement were designed, and the water requirement of normal consistency, setting time, mechanical properties and water resistance of the cement were studied, and the hydration products were analyzed by XRD and SEM. The results show that titanium gypsum can increase the water requirement of normal consistency and prolong the setting time, which has an adverse effect on the mechanical properties and water resistance. The adverse effect of titanium gypsum can be compensated by increasing the content of clinker appropriately. When the content of clinker is 25%, the compressive strength of composite cementing material can reach 30 MPa at 28 d. In the experimental group with higher titanium gypsum or clinker content, the hydration products were mainly ettringite and calcium silicate/aluminate hydrate, while in the experimental group with higher content of slag and lower content of clinker, the hydration products were mainly amorphous calcium silicate/aluminate hydrate.
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Key words:
- Mineral materials /
- Titanium gypsum /
- Slag /
- Ettringite /
- Calcium silicate/aluminate hydrate
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表 1 原材料的XRF分析结果/%
Table 1. XRF analysis results of raw materials
成分 CaO SiO2 TiO2 Al2O3 MgO Fe2O3 SO3 P2O5 Na2O K2O MnO 矿渣 28.06 27.76 15.69 13.57 6.13 4.22 2.41 0.05 0.81 0.55 0.45 钛石膏 36.22 2.90 1.20 1.58 1.62 13.56 41.95 0.37 0.10 0.07 0.27 熟料 68.17 18.54 0.67 4.44 1.40 3.57 1.68 0.12 0.31 0.83 0.10 
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表 2 原料的基本性能
Table 2. Basic properties of raw materials
原料 密度/（g/cm3） 堆积孔隙率/% 比表面积/（m2/kg） 矿渣 2.96 0.536 500.4 钛石膏 2.38 0.498 676.8 熟料 3.08 0.483 378.4
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表 3 实验配合比/%
Table 3. Test mix ratios
组号 钛石膏 矿渣 熟料 水灰比 T1 85 10 5 28.4 T2 65 30 5 28.4 T3 45 50 5 28.4 T4 25 70 5 28.4 T5 5 90 5 28.4 K1 40 55 5 28.4 K2 40 50 10 28.4 K3 40 45 15 28.4 K4 40 40 20 28.4 K5 40 35 25 28.4
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表 4 标准稠度用水和凝结时间测定结果
Table 4. Determination results of standard consistency water and setting time
组号 标准稠度用水量/% 初凝时间/min 终凝时间/min T1 31.7 264 451 T2 29.3 250 442 T3 28.7 248 421 T4 28.3 228 430 T5 28.0 191 401 K1 28.3 248 421 K2 28.3 214 371 K3 27.7 207 361 K4 27.3 153 307 K5 27.0 138 304
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