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A platform for research: civil engineering, architecture and urbanism
Modified concrete recycled fine aggregate and preparation method thereof
The invention belongs to the field of comprehensive recycling of solid wastes, and discloses a modified concrete recycled fine aggregate and a preparation method thereof. The preparation method comprises the following steps: (1) stirring the recycled fine aggregate, then cleaning, screening out powder with the particle size of less than 0.075 mm, and drying; (2) adding modified nano polyimide into the dried recycled fine aggregate, and uniformly mixing to form a recycled fine aggregate mixture; and (3) placing the recycled fine aggregate mixture in a closed space, uniformly stirring at the rotating speed of 50-100r/min, heating to 400-600 DEG C while stirring, reacting for 2-3 hours, and then cooling to room temperature to obtain the modified concrete recycled fine aggregate. The crushing index and the mortar water demand ratio of the modified concrete recycled fine aggregate prepared by the method disclosed by the invention are obviously reduced, the mortar strength ratio is obviously increased, and the modified concrete recycled fine aggregate has good mechanical properties, lower water absorption and higher mortar strength, and is used in concrete and mortar to obviously improve the strength of the concrete and the mortar.
本发明属于固体废弃物综合再利用领域，公开了一种改性混凝土再生细骨料及其制备方法。其制备方法包括以下步骤：(1)将再生细骨料搅拌，然后清洗、筛除粒径0.075mm以下的粉末，烘干；(2)向烘干后的再生细骨料中加入改性纳米聚酰亚胺，混合均匀，形成再生细骨料混合料；(3)将再生细骨料混合料置于封闭空间内，在转速50～100r/min下搅拌均匀，维持搅拌下升温至400～600℃，反应2～3h，然后降温至室温，得到改性混凝土再生细骨料。本发明方法制备的改性混凝土再生细骨料的压碎指标、胶砂需水量比明显下降，胶砂强度比明显升高，具有良好的力学性能、较低的吸水率、较高的胶砂强度，用于混凝土和砂浆中明显提高了混凝土和砂浆的强度。
Modified concrete recycled fine aggregate and preparation method thereof
The invention belongs to the field of comprehensive recycling of solid wastes, and discloses a modified concrete recycled fine aggregate and a preparation method thereof. The preparation method comprises the following steps: (1) stirring the recycled fine aggregate, then cleaning, screening out powder with the particle size of less than 0.075 mm, and drying; (2) adding modified nano polyimide into the dried recycled fine aggregate, and uniformly mixing to form a recycled fine aggregate mixture; and (3) placing the recycled fine aggregate mixture in a closed space, uniformly stirring at the rotating speed of 50-100r/min, heating to 400-600 DEG C while stirring, reacting for 2-3 hours, and then cooling to room temperature to obtain the modified concrete recycled fine aggregate. The crushing index and the mortar water demand ratio of the modified concrete recycled fine aggregate prepared by the method disclosed by the invention are obviously reduced, the mortar strength ratio is obviously increased, and the modified concrete recycled fine aggregate has good mechanical properties, lower water absorption and higher mortar strength, and is used in concrete and mortar to obviously improve the strength of the concrete and the mortar.
本发明属于固体废弃物综合再利用领域，公开了一种改性混凝土再生细骨料及其制备方法。其制备方法包括以下步骤：(1)将再生细骨料搅拌，然后清洗、筛除粒径0.075mm以下的粉末，烘干；(2)向烘干后的再生细骨料中加入改性纳米聚酰亚胺，混合均匀，形成再生细骨料混合料；(3)将再生细骨料混合料置于封闭空间内，在转速50～100r/min下搅拌均匀，维持搅拌下升温至400～600℃，反应2～3h，然后降温至室温，得到改性混凝土再生细骨料。本发明方法制备的改性混凝土再生细骨料的压碎指标、胶砂需水量比明显下降，胶砂强度比明显升高，具有良好的力学性能、较低的吸水率、较高的胶砂强度，用于混凝土和砂浆中明显提高了混凝土和砂浆的强度。
Modified concrete recycled fine aggregate and preparation method thereof
一种改性混凝土再生细骨料及其制备方法
HAI RAN (author) / ZHANG MAOLIANG (author) / MA YAN (author) / LI JIANWEI (author) / LIU JUNXIA (author) / HUI CUN (author) / WANG XIAO (author) / YANG FEI (author) / CHENG XUELEI (author) / HUANG ZHENGQIANG (author)
2024-12-31
Patent
Electronic Resource
Chinese
IPC:
C04B
Kalk
,
LIME
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