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A platform for research: civil engineering, architecture and urbanism
Low-shrinkage anti-cracking ultra-high performance concrete as well as preparation method and application thereof
The invention provides low-shrinkage anti-cracking ultra-high-performance concrete as well as a preparation method and application thereof. The low-shrinkage anti-cracking ultra-high-performance concrete is prepared from the following raw materials in parts by weight: 33 to 50 parts of Portland cement, 19 to 28 parts of slag powder, 20 to 38 parts of fly ash, 12 to 28 parts of silica fume, 22 to 40 parts of gravel, 18 to 36 parts of modified fine aggregate, 15 to 26 parts of high-performance expanding agent, 12 to 28 parts of anti-cracking admixture, 17 to 29 parts of retarder, 2 to 8 parts of water reducing agent and 0 to 6 parts of ice chips. The prepared ultra-high performance concrete has the effects of low shrinkage and cracking resistance, the raw materials are reasonably selected and scientifically proportioned, the performance effects of the raw materials are synergistically exerted, and the ultra-high performance concrete is low in shrinkage rate, high in mechanical property and not prone to fracture; the 7d breaking strength of the prepared concrete is 39-43 MPa, the 28d breaking strength of the prepared concrete is 35-39 MPa, the 7d compressive strength of the prepared concrete is 201-206 MPa, the 28d compressive strength of the prepared concrete is 180-185 MPa, the prepared concrete is free of cracks, the shrinkage rate of the prepared concrete is 0.010-0.015%, and the breaking energy of the prepared concrete is 3.8-4.2 * 10 < 4 > J/m < 2 >; according to the present invention, the low shrinkage effect is provided, the high mechanical strength is provided, the durability and the bearing capacity are good, and the good prospect is provided in the application of the preparation of the fire evacuation platform.
本发明提供一种低收缩抗裂化超高性能混凝土及其制备方法和应用，包括以下重量份原料：硅酸盐水泥33‑50份、矿渣粉19‑28份、粉煤灰20‑38份、硅灰12‑28份、碎石22‑40份、改性细骨料18‑36份、高性能膨胀剂15‑26份、抗裂外加剂12‑28份、缓凝剂17‑29份、减水剂2‑8份、冰屑0‑6份；本发明制得的超高性能混凝土具有低收缩抗裂化性能的效果，原料合理选择原料，科学配比，协同发挥其性能作用，收缩率低，力学性能强，且不易于断裂；制得的混凝土7d抗折强度39‑43MPa，28d抗折强度35‑39MPa，7d抗压强度201‑206MPa，28d抗压强度180‑185MPa，无裂缝条数，收缩率0.10‑0.15‰，断裂能3.8‑4.2×104J/m2；具有低收缩效果的同时，还具有较高的机械强度，具有良好的耐久性和承载力，在制备消防疏散平台中的应用，具有较好的前景。
Low-shrinkage anti-cracking ultra-high performance concrete as well as preparation method and application thereof
The invention provides low-shrinkage anti-cracking ultra-high-performance concrete as well as a preparation method and application thereof. The low-shrinkage anti-cracking ultra-high-performance concrete is prepared from the following raw materials in parts by weight: 33 to 50 parts of Portland cement, 19 to 28 parts of slag powder, 20 to 38 parts of fly ash, 12 to 28 parts of silica fume, 22 to 40 parts of gravel, 18 to 36 parts of modified fine aggregate, 15 to 26 parts of high-performance expanding agent, 12 to 28 parts of anti-cracking admixture, 17 to 29 parts of retarder, 2 to 8 parts of water reducing agent and 0 to 6 parts of ice chips. The prepared ultra-high performance concrete has the effects of low shrinkage and cracking resistance, the raw materials are reasonably selected and scientifically proportioned, the performance effects of the raw materials are synergistically exerted, and the ultra-high performance concrete is low in shrinkage rate, high in mechanical property and not prone to fracture; the 7d breaking strength of the prepared concrete is 39-43 MPa, the 28d breaking strength of the prepared concrete is 35-39 MPa, the 7d compressive strength of the prepared concrete is 201-206 MPa, the 28d compressive strength of the prepared concrete is 180-185 MPa, the prepared concrete is free of cracks, the shrinkage rate of the prepared concrete is 0.010-0.015%, and the breaking energy of the prepared concrete is 3.8-4.2 * 10 < 4 > J/m < 2 >; according to the present invention, the low shrinkage effect is provided, the high mechanical strength is provided, the durability and the bearing capacity are good, and the good prospect is provided in the application of the preparation of the fire evacuation platform.
本发明提供一种低收缩抗裂化超高性能混凝土及其制备方法和应用，包括以下重量份原料：硅酸盐水泥33‑50份、矿渣粉19‑28份、粉煤灰20‑38份、硅灰12‑28份、碎石22‑40份、改性细骨料18‑36份、高性能膨胀剂15‑26份、抗裂外加剂12‑28份、缓凝剂17‑29份、减水剂2‑8份、冰屑0‑6份；本发明制得的超高性能混凝土具有低收缩抗裂化性能的效果，原料合理选择原料，科学配比，协同发挥其性能作用，收缩率低，力学性能强，且不易于断裂；制得的混凝土7d抗折强度39‑43MPa，28d抗折强度35‑39MPa，7d抗压强度201‑206MPa，28d抗压强度180‑185MPa，无裂缝条数，收缩率0.10‑0.15‰，断裂能3.8‑4.2×104J/m2；具有低收缩效果的同时，还具有较高的机械强度，具有良好的耐久性和承载力，在制备消防疏散平台中的应用，具有较好的前景。
Low-shrinkage anti-cracking ultra-high performance concrete as well as preparation method and application thereof
一种低收缩抗裂化超高性能混凝土及其制备方法和应用
KANG XIUHAN (author) / HUANG DI (author) / LIN XIANGUI (author) / MENG FAZHI (author)
2023-09-19
Patent
Electronic Resource
Chinese
IPC:
C04B
Kalk
,
LIME
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