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A platform for research: civil engineering, architecture and urbanism
High-strength anti-collapse backfill concrete for goaf and preparation method thereof
The invention provides high-strength anti-collapse backfill concrete for a goaf. The high-strength anti-collapse backfill concrete is prepared from 100 to 120 parts of slag powder, 1750 to 2100 parts of coarse aggregate, 1200 to 1550 parts of fine aggregate, 70 to 110 parts of fly ash, 315 to 360 parts of cementing powder, 8 to 12 parts of polycarboxylate superplasticizer and 130 to 180 parts of water, the cementing powder is prepared by grinding and mixing 100 to 200 parts of Portland cement, 180 to 360 parts of tailings, 50 to 80 parts of aluminum sulfate, 30 to 50 parts of alkaline activator and 40 to 60 parts of lime. The preparation method comprises the following steps: S1, mixing and grinding Portland cement, tailings, aluminum sulfate, sodium hydroxide and lime to form cementing powder; s2, mixing and stirring the cementing powder prepared in S1 with slag powder, coarse aggregate, fine aggregate and fly ash to form a solid mixture; s3, a water reducing agent and beneficiation water are added into the mixture obtained in S2, and uniform stirring is performed. The concrete is used for replacing direct use of slag and waste soil and stone to perform backfilling on a goaf, backfilling materials can be prevented from settling and collapsing, higher strength is achieved, better supporting performance on a mine is achieved, and collapse of the mine is prevented.
本发明提供一种采空区高强度防坍塌回填混凝土，包括：矿渣粉100‑120份、粗骨料1750‑2100份、细骨料1200‑1550份、粉煤灰70‑110份、胶固粉315‑360份、聚羧酸减水剂8‑12份、水130‑180份；所述胶固粉由100‑200份的硅酸盐水泥、180‑360份的尾砂、50‑80份的硫酸铝、30‑50份的碱性激发剂、40‑60份的石灰经粉磨混合制成。制备方法：S1，将硅酸盐水泥、尾砂、硫酸铝、氢氧化钠、石灰混合粉磨后形成胶固粉；S2，将S1制成的胶固粉与矿渣粉、粗骨料、细骨料、粉煤灰混合搅拌后形成固体混合物；S3，将减水剂和选矿水加入S2中得到的混合物中搅拌均匀，本发明使用本混凝土代替直接使用矿渣、废土石对采空区进行回填，可以防止回填材料沉降、坍塌，具有更高的强度，对矿山具有更好的支撑性，防止矿山发生倒塌。
High-strength anti-collapse backfill concrete for goaf and preparation method thereof
The invention provides high-strength anti-collapse backfill concrete for a goaf. The high-strength anti-collapse backfill concrete is prepared from 100 to 120 parts of slag powder, 1750 to 2100 parts of coarse aggregate, 1200 to 1550 parts of fine aggregate, 70 to 110 parts of fly ash, 315 to 360 parts of cementing powder, 8 to 12 parts of polycarboxylate superplasticizer and 130 to 180 parts of water, the cementing powder is prepared by grinding and mixing 100 to 200 parts of Portland cement, 180 to 360 parts of tailings, 50 to 80 parts of aluminum sulfate, 30 to 50 parts of alkaline activator and 40 to 60 parts of lime. The preparation method comprises the following steps: S1, mixing and grinding Portland cement, tailings, aluminum sulfate, sodium hydroxide and lime to form cementing powder; s2, mixing and stirring the cementing powder prepared in S1 with slag powder, coarse aggregate, fine aggregate and fly ash to form a solid mixture; s3, a water reducing agent and beneficiation water are added into the mixture obtained in S2, and uniform stirring is performed. The concrete is used for replacing direct use of slag and waste soil and stone to perform backfilling on a goaf, backfilling materials can be prevented from settling and collapsing, higher strength is achieved, better supporting performance on a mine is achieved, and collapse of the mine is prevented.
本发明提供一种采空区高强度防坍塌回填混凝土，包括：矿渣粉100‑120份、粗骨料1750‑2100份、细骨料1200‑1550份、粉煤灰70‑110份、胶固粉315‑360份、聚羧酸减水剂8‑12份、水130‑180份；所述胶固粉由100‑200份的硅酸盐水泥、180‑360份的尾砂、50‑80份的硫酸铝、30‑50份的碱性激发剂、40‑60份的石灰经粉磨混合制成。制备方法：S1，将硅酸盐水泥、尾砂、硫酸铝、氢氧化钠、石灰混合粉磨后形成胶固粉；S2，将S1制成的胶固粉与矿渣粉、粗骨料、细骨料、粉煤灰混合搅拌后形成固体混合物；S3，将减水剂和选矿水加入S2中得到的混合物中搅拌均匀，本发明使用本混凝土代替直接使用矿渣、废土石对采空区进行回填，可以防止回填材料沉降、坍塌，具有更高的强度，对矿山具有更好的支撑性，防止矿山发生倒塌。
High-strength anti-collapse backfill concrete for goaf and preparation method thereof
一种采空区高强度防坍塌回填混凝土及制备方法
YE SHENG (author) / ZENG LEI (author) / LIAO SHIZHEN (author) / ZHENG QIAN (author) / ZHUO GUIZHOU (author) / BAI YUNXIANG (author)
2024-02-06
Patent
Electronic Resource
Chinese
IPC:
C04B
Kalk
,
LIME
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