Feasibility analysis of high-titanium heavy slag as aggregate for asphalt mixture
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摘要: 以攀西地区高钛重矿渣为研究对象，通过理论及试验研究分析了其作为集料用于沥青混合料的可行性，并与目前沥青混合料常用的玄武岩等天然石料进行了对比分析。研究结果表明：高钛重矿渣表观形貌呈粗糙多孔状且为碱性集料，与沥青黏附性能优于天然石料，粘附性等级为5级；高钛重矿渣为五元渣系，属低钙富钛渣、低活性渣，体积稳定性及高温稳定性好；高钛重矿渣具有优异的颗粒形态特性且力学性能、耐久性能良好，但密度略低于天然石料且吸水率更高；高钛重矿渣作为沥青混合料集料的综合性能不低于天然石料，且具有明显的环境、经济效益。Abstract: Taking the high-titanium heavy slag in Panxi area as the research object, the feasibility of using it as aggregate for asphalt mixture was analyzed through theoretical and experimental research, also it was compared with the natural stone such as basalt commonly used in asphalt mixture at present. The results show that the surface morphology of high-titanium heavy slag is rough and porous, and it is alkaline aggregate. Its adhesion performance with asphalt is better than that of natural stone, and its adhesion grade is grade 5. High-titanium heavy slag is a five-element slag system, belonging to low calcium and titanium-rich slag and low active slag, with good volume stability and high-temperature stability. High-titanium heavy slag has excellent particle morphology, mechanical properties and durability, but its density is slightly lower than that of natural stone and the water absorption is higher. The comprehensive performance of high-titanium heavy slag as aggregate of asphalt mixture is no worse than natural stone, and it has obvious environmental and economic benefits.
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Key words:
- high titanium heavy slag /
- asphalt mixture /
- apparent characteristics /
- stability /
- adhesivity
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图 1 高钛重矿渣、玄武岩及石灰岩的宏观形貌
Figure 1. Macroscopic morphologies of high-titanium heavy slag, basalt and limestone
图 4 高钛重矿渣膨胀率随时间变化趋势
Figure 4. Trend of expansion rate of high-titanium heavy slag over time
表 1 基质沥青性能参数
Table 1. Performance parameters of asphalt matrix
25℃针入度（0.1 mm计）/（°） 15 ℃延度/cm 软化点/℃ 闪点/℃ 60 ℃动力粘度/(Pa·s) 68 >150 48 350 189 
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表 2 膨胀性试验级配
Table 2. Grade of expansion test
尺寸/mm 筛余/% 尺寸/mm 筛余/% 16 5.5 1.18 4.5 13.2 20 0.6 3 9.5 23.5 0.3 2 4.75 30.5 0.15 2 2.36 5.5 0.075 3.5
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表 3 普通高炉渣与高钛重矿渣主要组成成分
Table 3. Main components of common blast furnace slag and high-titanium heavy slag
% 矿渣类型 CaO SiO2 A12O3 MgO TiO2 普通高炉渣 38～46 26～42 7～20 4～13 高钛重矿渣 22～29 22～26 16～19 7～9 20～29
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表 4 不同粒径骨料的密度和吸水率
Table 4. Density and water absorption of aggregates with different particle sizes
公称最大粒径/mm 表观相对密度 毛体积相对密度 吸水率/% 1# 2# 3# 1# 2# 3# 1# 2# 3# 16 2.66 2.80 2.74 2.55 2.57 2.70 2.89 0.62 0.32 13.2 2.68 2.84 2.75 2.54 2.58 2.72 3.41 0.84 0.37 9.5 2.63 2.81 2.77 2.47 2.58 2.73 4.22 1.19 0.41 4.75 2.61 2.80 2.77 2.42 2.56 2.73 4.93 1.40 0.44
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表 5 不同集料的针片状含量、压碎值及磨耗值
Table 5. The needle-shape content, crushing value and wear value of different aggregates
集料类型 针片状含量/% 压碎值/% 磨耗值/% 4.75～9.5 mm 9.5～13.2 mm 13.2～16 mm 16～19 mm 高钛重矿渣 4.6 4.0 3.9 6.0 11.6 15.6 玄武岩 8.9 7.1 7.5 8.2 11.2 12.9 石灰岩 15.8 10.9 9.9 11.3 15.2 17.5 规范值 ≤18 ≤12 ≤12 ≤12 ≤26 ≤28
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表 6 不同集料与沥青粘附性
Table 6. Adhesion of different aggregates to asphalt
水煮时间/min 粘附性等级/级 高钛重矿渣 玄武岩 石灰岩 3 5 5 5 5 5 4 3 10 3 3 2 15 2 2 1 20 1 1 1
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