Bridge joint seam early strength UHPC material and preparation method thereof

Abstract

The invention discloses a bridge joint seam early strength UHPC material, which is characterized in that the bridge joint seam early strength UHPC material comprises silica fume, limestone powder, cement, river sand, mixing water, a water reducing agent and steel fibers, and an addition ratio of the cement to the silica fume to the limestone powder to the river sand to the mixing water to the water reducing agent is (0.7-1.0): (0.1-0.2): (0.1-0.2): (0.8-1.1): (0.15-0.20): (0.02-0.05). The invention further discloses a preparation method of the bridge joint seam early strength UHPC material. According to the bridge joint seam early strength UHPC material, a cementing material in UHPC is replaced with a large amount of inert material, so that the early strength is high, the later strength iscontinuously increased, and the phenomenon of strength reduction cannot be caused by early loading. A wet joint constructed by using the concrete has the respective advantages of a traditional wet joint and a glue joint, the purpose of rapid construction can be achieved, and the advantages of continuity of common reinforcing steel bars, low requirement for construction and manufacturing precision, good durability and the like are achieved.

Description

technical field [0001] The invention belongs to the technical field of bridge engineering materials, and more specifically relates to an early-strength UHPC material for bridge splicing joints and a preparation method thereof. Background technique [0002] In bridge engineering, at present, wet joints and glued joints are mainly used for segmental prefabrication at home and abroad. Wet joints are to reserve a certain space between two adjacent prefabricated beam sections, and bind them in the form of binding steel bars and cast-in-place concrete. The prefabricated segments are connected into a whole joint, and the prestressing force is applied after the joint concrete reaches the strength. This construction method is reliable in quality. Adhesive joints are occluded by shear keys between two adjacent prefabricated beam sections, and the matching surfaces are bonded with adhesives, which is convenient for adjustment of construction errors; compared with traditional wet joint...

AI Technical Summary

Problems solved by technology

[0004] Traditional early-strength concrete or UHPC achieves high early strength by increasing the amount of cementitious materials (including Portland cement, aluminate cement, sulphoaluminate cement or lime, gypsum, etc.), but it is easy to cause large shrinkage. Loading affects the later strength, so ordinary early-strength concrete and existing early-strength ultra-high performance concrete often have the disadvantages of high early strength, low late strength, and early loading will lead to strength shrinkage, etc.

The reduction of concrete strength attenuation in the later period cannot meet the stress requirements of splicing joints, and ordinary early-strength concrete and existing early-strength UHPC cannot meet the needs of wet joints