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A platform for research: civil engineering, architecture and urbanism
High-performance concrete suitable for positive and negative temperature alternating environment and preparation method thereof
The invention discloses high-performance concrete suitable for a positive and negative temperature alternating environment. The high-performance concrete is prepared from the following raw materials: early-strength ordinary Portland cement, sulphoaluminate cement, silica fume, fly ash, machine-made sand, steel fibers, a JB-1 type antifreezing agent, a high-efficiency polycarboxylate superplasticizer, water and the like. According to the invention, the liquid anti-freezing agent has the function of interfering the hydrogen-bond interaction of water molecules, so that the crystal structure or solid-phase molecular structure of the frozen ultra-high performance concrete is changed, the liquid-phase crystallization frost heaving pressure is macroscopically reduced, and an early-strength structure is formed; meanwhile, the anti-freezing agent is added, so that the liquid phase freezing point of the ultra-high performance concrete can be effectively reduced, free water still exists in the concrete in a negative temperature environment, and hydration of a cementing material is continued. In addition, the sulphoaluminate cement is internally doped to improve the hydration speed of the cementing material and accelerate the formation of an early strength structure; and under the combined action of the two, the negative temperature resistance of the ultra-high performance concrete when the negative temperature comes can be obviously enhanced.
本发明公开了一种适用于正负温交替环境的高性能混凝土，此种高性能混凝土原料包括早强型普通硅酸盐水泥、硫铝酸盐水泥、硅灰、粉煤灰、机制砂、钢纤维、JB‑1型防冻剂、高效聚羧酸减水剂和水等原料。本发明依靠液体防冻剂本身干扰水分子氢键作用的功能，使得在超高性能混凝土受冻后晶体结构或固相分子结构改变，宏观上减小液相结晶冻胀压力，形成早强结构；同时防冻剂加入能有效降低超高性能混凝土液相冰点，使得负温环境时混凝土内仍有自由水，胶凝材料水化得以延续。此外采用内掺硫铝酸盐水泥以提高胶凝材料水化速度，加快早强结构形成；二者综合作用下可明显加强超高性能混凝土在负温来临时的抵抗负温的能力。
High-performance concrete suitable for positive and negative temperature alternating environment and preparation method thereof
The invention discloses high-performance concrete suitable for a positive and negative temperature alternating environment. The high-performance concrete is prepared from the following raw materials: early-strength ordinary Portland cement, sulphoaluminate cement, silica fume, fly ash, machine-made sand, steel fibers, a JB-1 type antifreezing agent, a high-efficiency polycarboxylate superplasticizer, water and the like. According to the invention, the liquid anti-freezing agent has the function of interfering the hydrogen-bond interaction of water molecules, so that the crystal structure or solid-phase molecular structure of the frozen ultra-high performance concrete is changed, the liquid-phase crystallization frost heaving pressure is macroscopically reduced, and an early-strength structure is formed; meanwhile, the anti-freezing agent is added, so that the liquid phase freezing point of the ultra-high performance concrete can be effectively reduced, free water still exists in the concrete in a negative temperature environment, and hydration of a cementing material is continued. In addition, the sulphoaluminate cement is internally doped to improve the hydration speed of the cementing material and accelerate the formation of an early strength structure; and under the combined action of the two, the negative temperature resistance of the ultra-high performance concrete when the negative temperature comes can be obviously enhanced.
本发明公开了一种适用于正负温交替环境的高性能混凝土，此种高性能混凝土原料包括早强型普通硅酸盐水泥、硫铝酸盐水泥、硅灰、粉煤灰、机制砂、钢纤维、JB‑1型防冻剂、高效聚羧酸减水剂和水等原料。本发明依靠液体防冻剂本身干扰水分子氢键作用的功能，使得在超高性能混凝土受冻后晶体结构或固相分子结构改变，宏观上减小液相结晶冻胀压力，形成早强结构；同时防冻剂加入能有效降低超高性能混凝土液相冰点，使得负温环境时混凝土内仍有自由水，胶凝材料水化得以延续。此外采用内掺硫铝酸盐水泥以提高胶凝材料水化速度，加快早强结构形成；二者综合作用下可明显加强超高性能混凝土在负温来临时的抵抗负温的能力。
High-performance concrete suitable for positive and negative temperature alternating environment and preparation method thereof
适用于正负温交替环境下的高性能混凝土及制备方法
WANG ZHENGWEI (author) / WEN LIANG (author) / MA JUNFENG (author) / GAO RUNBAO (author) / LIU LIQIANG (author) / PAN LONG (author) / LIU JINGQUAN (author) / ZHANG MINGXI (author) / YUAN QIYIN (author) / HUA QIUJUN (author)
2024-03-19
Patent
Electronic Resource
Chinese
IPC:
C04B
Kalk
,
LIME
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