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Low-shrinkage low-viscosity ultrahigh-strength concrete
The invention belongs to the technical field of concrete preparation, and particularly relates to low-shrinkage low-viscosity ultrahigh-strength concrete which is prepared from the following raw materials in percentage by weight in the formula: 7 to 11 percent of a water reducing agent, 5 to 8.8 percent of machine-made sand, 3.5 to 8.5 percent of a cementing material, 8.5 to 10.5 percent of gravel and 7.5 to 12.5 percent of water, wherein the water reducing agent is a naphthalene-based high-efficiency water reducing agent, and the mixing amount range of the water reducing agent is 0.75-1.5% for powder, and 1.5-2.5% for liquid, when porous aggregate is adopted, water is added and stirred firstly, and then the water reducing agent is added; and the machine-made sand is rock particles which are prepared through mechanical crushing and screening and have the particle size smaller than 4.75 mm, but does not comprise particles of soft rocks and weathered rocks. Through cooperative use of the water reducing agent, the machine-made sand, the cementing material and the gravel, the obtained concrete has low shrinkage, so that the cracking phenomenon after use can be avoided, a relatively low adhesive component is used, the shrinkage rate is low, the strength is high, the viscosity is relatively low, the construction efficiency of the pump concrete is ensured, the probability of pumping accidents is reduced, and funds are saved.
本发明公开的属于混凝土制备技术领域，具体为一种低收缩低粘度超高强混凝土，配方中的原料按重量百分比组成分别是，减水剂7‑11％，机制砂5‑8.8％，胶凝材料3.5‑8.5％，碎石8.5‑10.5％，水7.5‑12.5％；其中，所述减水剂为萘系高效减水剂，掺量范围：粉剂：0.75‑1.5％；液体:1.5‑2.5％，采用多孔骨料时宜先加水搅拌，再加减水剂；所述机制砂:由机械破碎,筛分制成的,粒径小于4.75mm的岩石颗粒,但不包括软质岩,风化岩的颗粒。该发明通过减水剂、机制砂、胶凝材料和碎石的配合使用，可使得本发明中获得混凝土具有低收缩，从而可避免在使用后发生开裂现象使用了较低的胶粘组分，其收缩率低、强度高，且粘度也相对较低，保证泵送混凝土施工效率，降低了泵送事故的发生的概率，节约了资金。
Low-shrinkage low-viscosity ultrahigh-strength concrete
The invention belongs to the technical field of concrete preparation, and particularly relates to low-shrinkage low-viscosity ultrahigh-strength concrete which is prepared from the following raw materials in percentage by weight in the formula: 7 to 11 percent of a water reducing agent, 5 to 8.8 percent of machine-made sand, 3.5 to 8.5 percent of a cementing material, 8.5 to 10.5 percent of gravel and 7.5 to 12.5 percent of water, wherein the water reducing agent is a naphthalene-based high-efficiency water reducing agent, and the mixing amount range of the water reducing agent is 0.75-1.5% for powder, and 1.5-2.5% for liquid, when porous aggregate is adopted, water is added and stirred firstly, and then the water reducing agent is added; and the machine-made sand is rock particles which are prepared through mechanical crushing and screening and have the particle size smaller than 4.75 mm, but does not comprise particles of soft rocks and weathered rocks. Through cooperative use of the water reducing agent, the machine-made sand, the cementing material and the gravel, the obtained concrete has low shrinkage, so that the cracking phenomenon after use can be avoided, a relatively low adhesive component is used, the shrinkage rate is low, the strength is high, the viscosity is relatively low, the construction efficiency of the pump concrete is ensured, the probability of pumping accidents is reduced, and funds are saved.
本发明公开的属于混凝土制备技术领域，具体为一种低收缩低粘度超高强混凝土，配方中的原料按重量百分比组成分别是，减水剂7‑11％，机制砂5‑8.8％，胶凝材料3.5‑8.5％，碎石8.5‑10.5％，水7.5‑12.5％；其中，所述减水剂为萘系高效减水剂，掺量范围：粉剂：0.75‑1.5％；液体:1.5‑2.5％，采用多孔骨料时宜先加水搅拌，再加减水剂；所述机制砂:由机械破碎,筛分制成的,粒径小于4.75mm的岩石颗粒,但不包括软质岩,风化岩的颗粒。该发明通过减水剂、机制砂、胶凝材料和碎石的配合使用，可使得本发明中获得混凝土具有低收缩，从而可避免在使用后发生开裂现象使用了较低的胶粘组分，其收缩率低、强度高，且粘度也相对较低，保证泵送混凝土施工效率，降低了泵送事故的发生的概率，节约了资金。
Low-shrinkage low-viscosity ultrahigh-strength concrete
一种低收缩低粘度超高强混凝土
LIU RUIDONG (author)
2021-09-24
Patent
Electronic Resource
Chinese
IPC:
C04B
Kalk
,
LIME
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