Preparation method of ultra-high performance concrete rheologic stabilizer

Abstract

The invention belongs to the technical field of advanced civil engineering materials, and particularly relates to a preparation method of an ultra-high performance concrete rheologic stabilizer. According to the preparation method of the ultra-high performance concrete rheologic stabilizer, a grinding technology is adopted, stearate is used for modifying bentonite and attapulgite, then lithium salt and white carbon black are added, and are mixed evenly, thus the ultra-high performance concrete rheologic stabilizer is prepared, and after a binding material in ultra-high performance concrete isreplaced by the prepared ultra-high performance concrete rheologic stabilizer of the same mass, the early anti-disturbance performance of an ultra-high performance concrete mixture can be significantly improved, so that the problem that the ultra-high performance concrete mixture easily flows after being poured on a slope portion is solved, and the pouring efficiency and quality are improved. Thepreparation method of the ultra-high performance concrete rheologic stabilizer has the advantages that a preparation technology is simple, an obtained product has an excellent effect, and the like, and application and popularization are easy.

Description

technical field [0001] The invention belongs to the technical field of advanced civil engineering materials, and in particular relates to a preparation method of an ultra-high-performance concrete rheological stabilizer. Background technique [0002] Ultra High Performance Concrete (UHPC for short) is a new type of cement-based composite material with ultra-high strength, ultra-high toughness and high durability. From the perspective of specific strength and specific stiffness, UHPC can be classified as "lightweight High quality and high strength" material. At present, ultra-high-performance concrete is mainly used for the pavement of orthotropic steel bridge decks. This technology can effectively improve the stiffness of steel bridge decks, and is expected to solve the two problems of fatigue cracking of steel structures and frequent damage of pavement layers in orthotropic steel deck systems. big problem. However, in the process of bridge design, due to the consideration...

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Problems solved by technology

However, in the bridge design process, due to the consideration of the elevation design, drainage design and superelevation design of the curve section, the bridge deck has a certain transverse slope and longitudinal slope. The high-performance concrete will flow to the lower part, resulting in uneven thickness of the ultra-high-performance concrete layer on the bridge deck, and high pressure on the side formwork, especially for the ramp and other parts, due to the large longitudinal slope, if the ultra-high-performance concrete If it is directly poured on the ramp surface, the flow phenomenon of ultra-high performance concrete will be more obvious, which will seriously affect the pouring quality of ultra-high performance concrete

[0003] In order to solve the problem that ultra-high-performance concrete is prone to flow after pouring in structural parts with a certain slope, Chen Wei proposed to adopt the method of inverted mold construction in the article "Construction Technology of Ultra-high-performance Concrete Pavement on Steel Bridge Deck", but this method It requires high level of construction technology, and the construction efficiency is low, and the actual application effect is average

[0004] Adding organic water-retaining thickening materials such as cellulose ether, starch ether or Wenlun glue to the cement-based mixture can significantly increase the viscosity of the mixture and thereby improve its stability, but the amount of these substances is difficult to control and is difficult to control when combined with other additives. Adding it to ultra-high-performance concrete will easily cause problems such as rapid loss of workability in the mixture with a relatively high viscosity, making it impossible to continue construction

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