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废弃水泥混凝土再生集料的特性
废弃水泥混凝土再生集料的特性
Characteristics of recycled aggregate for waste cement concrete
外观特性与购买的天然集料有些不同，大部分废弃水泥混凝土再生集料表面孔隙较多且较粗糙，这主要是因为部分集料是由水泥砂浆包裹石子形成的。由于强化了加工细节，粗颗粒形状基本接近立方体且棱角分明，符合沥青混合料对集料外观的要求。
The appearance characteristics are different from those of the natural aggregate purchased, most of the recycled aggregate of waste cement concrete has more and more rough surface pores, mainly because part of the aggregate is formed by the cement mortar wrapped in stone. Because the processing details are strengthened, the shape of coarse particles is basically near the cube, and the corners are clear, which is consistent with the requirements of asphalt mixture for aggregate appearance.
物理性质。(1)密度。可知各种规格的废弃水泥混凝土再生集料的表观相对密度能够满足《公路沥青路面施工技术规范》的要求。
Physical property。 (1) density. It can be seen that the apparent relative density of all kinds of waste cement concrete recycled aggregate can meet the requirements of "highway asphalt pavement construction technology specification".
(2)孔隙率。从外观上看废弃水泥混凝土再生集料表面多孔，由于集料孔隙率的大小会影响沥青混合料中沥青与集料的黏附性，从而影响沥青混合料的水稳定性等路用性能，故本研究通过试验检测了废弃水泥混凝土再生粗集料的孔隙率。
(2) porosity. In appearance, the surface of recycled aggregate of waste cement concrete is porous. Because the size of aggregate porosity will affect the adhesion of asphalt and aggregate in asphalt mixture, it affects the water stability of asphalt mixture and other road properties. Therefore, the porosity of recycled coarse aggregate of waste cement concrete is tested by test.
数据可见废弃水泥混凝土再生集料的孔隙率比天然石灰岩粗集料大很多，其原因是再生粗集料表面附有水泥砂浆，水泥砂浆硬化后一般表面会密集分布很多细小的孔隙；同时，废弃水泥混凝土再生集料由于使用时间较长，部分已发生风化，产生了很多细微裂缝，而天然石灰岩粗集料中的孔隙仅仅是岩石本身的孔隙，其数量较少。
The data can be seen that the porosity of recycled aggregate concrete is much larger than that of natural limestone coarse aggregate. The reason is that cement mortar is attached to the surface of recycled coarse aggregate, and the surface of cement mortar will be densely distributed in a lot of fine pores after hardened cement mortar. At the same time, the waste cement concrete reraw aggregate is partly used for a long time. Weathering has produced many fine fissures, while the pores in natural limestone aggregates are only pores of rock themselves, and the number of them is relatively small.
Characteristics of recycled aggregate for waste cement concrete
外观特性与购买的天然集料有些不同，大部分废弃水泥混凝土再生集料表面孔隙较多且较粗糙，这主要是因为部分集料是由水泥砂浆包裹石子形成的。由于强化了加工细节，粗颗粒形状基本接近立方体且棱角分明，符合沥青混合料对集料外观的要求。
The appearance characteristics are different from those of the natural aggregate purchased, most of the recycled aggregate of waste cement concrete has more and more rough surface pores, mainly because part of the aggregate is formed by the cement mortar wrapped in stone. Because the processing details are strengthened, the shape of coarse particles is basically near the cube, and the corners are clear, which is consistent with the requirements of asphalt mixture for aggregate appearance.
物理性质。(1)密度。可知各种规格的废弃水泥混凝土再生集料的表观相对密度能够满足《公路沥青路面施工技术规范》的要求。
Physical property。 (1) density. It can be seen that the apparent relative density of all kinds of waste cement concrete recycled aggregate can meet the requirements of "highway asphalt pavement construction technology specification".
(2)孔隙率。从外观上看废弃水泥混凝土再生集料表面多孔，由于集料孔隙率的大小会影响沥青混合料中沥青与集料的黏附性，从而影响沥青混合料的水稳定性等路用性能，故本研究通过试验检测了废弃水泥混凝土再生粗集料的孔隙率。
(2) porosity. In appearance, the surface of recycled aggregate of waste cement concrete is porous. Because the size of aggregate porosity will affect the adhesion of asphalt and aggregate in asphalt mixture, it affects the water stability of asphalt mixture and other road properties. Therefore, the porosity of recycled coarse aggregate of waste cement concrete is tested by test.
数据可见废弃水泥混凝土再生集料的孔隙率比天然石灰岩粗集料大很多，其原因是再生粗集料表面附有水泥砂浆，水泥砂浆硬化后一般表面会密集分布很多细小的孔隙；同时，废弃水泥混凝土再生集料由于使用时间较长，部分已发生风化，产生了很多细微裂缝，而天然石灰岩粗集料中的孔隙仅仅是岩石本身的孔隙，其数量较少。
The data can be seen that the porosity of recycled aggregate concrete is much larger than that of natural limestone coarse aggregate. The reason is that cement mortar is attached to the surface of recycled coarse aggregate, and the surface of cement mortar will be densely distributed in a lot of fine pores after hardened cement mortar. At the same time, the waste cement concrete reraw aggregate is partly used for a long time. Weathering has produced many fine fissures, while the pores in natural limestone aggregates are only pores of rock themselves, and the number of them is relatively small.
