Steel fiber and high-performance synthetic fiber mixed toughened RPC (reactive powder concrete) and preparation method

A technology of synthetic fibers and steel fibers, applied in the field of concrete, can solve the problems of limited toughening effect, small diameter of fine polyethylene fibers, affecting dispersibility, etc., and achieve the effects of improving mesostructure, improving mechanical toughness, and improving toughness.

Active Publication Date: 2014-01-08
江苏丹凤建筑集成化科技有限公司
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, when the diameter of fine polyethylene fiber is small and the content is high, the dispersion is affected, so the toughening effect is limited

Method used

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  • Steel fiber and high-performance synthetic fiber mixed toughened RPC (reactive powder concrete) and preparation method
  • Steel fiber and high-performance synthetic fiber mixed toughened RPC (reactive powder concrete) and preparation method
  • Steel fiber and high-performance synthetic fiber mixed toughened RPC (reactive powder concrete) and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 3

[0043] Embodiment 3 is compared with embodiment 1 and can be known, the RPC specimen that has mixed steel fiber and fine polyethylene fiber has improved 109% than the test piece toughness index that single mixes steel fiber, and the effect of improving is not very obvious, and the test piece After the first crack, the bearing capacity has an obvious jump drop.

Embodiment 4

[0044] Comparing Example 4 with Examples 1, 2, and 3, it can be seen that the toughness of the test piece that is added with steel fiber, thick polyvinyl alcohol fiber, and fine polyethylene fiber is higher than that of only mixed with steel fiber, mixed with steel fiber, and coarse polyethylene fiber. Vinyl alcohol fibers, samples mixed with steel fibers and fine polyethylene fibers increased by 40%, 109%, and 185% respectively, and the toughening effect was particularly obvious. During the test, even when the specimen is damaged, the specimen still maintains a good integrity, and the bearing capacity decreases slowly after the crack appears, and has the characteristics of strain hardening and multi-crack expansion, that is, in the descending section of the full load-deflection curve , after the peak load appeared, the bearing capacity dropped for a while, and then the bearing capacity began to rise again, and two peak loads appeared, which is a characteristic that ordinary fi...

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Abstract

The invention provides steel fiber and high-performance synthetic fiber mixed toughened RPC (reactive powder concrete) and a preparation method, belonging to the technical field of concrete. The toughened RPC is characterized in that raw materials include Portland cement, superfine cement, admixtures, additives, steel fibers, coarse polypropylene fibers, fine polyvinyl alcohol fibers and water; the water-binder ratio is 0.18-0.21; the Portland cement and the superfine cement respectively account for 17-20% and 8-9% of total concrete by mass; the steel fibers, the coarse polypropylene fibers and the fine polyvinyl alcohol fibers respectively account for 1-3%, 1.2-1.7% and 0.3-0.6% of the whole concrete by volume. The preparation method comprises the steps of pouring sand and powder into a stirrer to be stirred uniformly, then adding the additives and water, mixing the fibers and stirring the materials when the stirred materials are changed to colloids from granules, pouring after the fibers are dispersed uniformly, and carrying out vibratory compaction or vibration molding and curing. The toughened RPC and the preparation method have the beneficial effects that the mechanical toughness of the RPC can be improved, and the economical efficiency and wide applicability of the material can be improved.

Description

technical field [0001] The invention relates to a toughened RPC mixed with steel fibers and high-performance synthetic fibers and a preparation method thereof, which belongs to the technical field of concrete and is suitable for concrete engineering structures requiring high toughness such as bridges, roads, building structural components, etc., and belongs to concrete technology field. Background technique [0002] RPC (Reactive Powder Concrete, hereinafter abbreviated as RPC) is a new type of high-performance concrete with ultra-high strength, high durability and high volume stability. Due to its different preparation and construction techniques, its mechanical properties, deformation ability and durability are obviously different from ordinary concrete and high-strength concrete, including: no coarse aggregate, minimizing size defects; adding steel fibers, increasing toughness ; Use high-efficiency water-reducing agent to reduce the water-binder ratio and porosity; high-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/00C04B14/48
Inventor 邓宗才
Owner 江苏丹凤建筑集成化科技有限公司
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