Ultrahigh-performance concrete, ultrahigh-performance concrete cored slab and preparation method thereof

Abstract

The invention provides ultrahigh-performance concrete, an ultrahigh-performance concrete cored slab and a preparation method thereof and belongs to the technical field of concrete members. The ultrahigh-performance concrete comprises the following components in parts by weight: 20-30 parts of Portland cement, 3-8 parts of silica fume, 3-8 parts of coal ash microspheres, 20-30 parts of medium sand,20-30 parts of fine sand, 4-7 parts of steel fibers, 5-7 parts of water, 0.5-1 part of water reducing agent, 0.5-1 part of anti-cracking and toughening agent and 0.5-1 part of defoaming agent; and the water reducing rate of the water reducing agent is 35% or above. Due to the adoption of the components and ratios, the gap of the ultrahigh-performance concrete can be minimized, furthermore, waterin the gap can be favorably extruded, the flowability of the concrete is improved, and the ultrahigh-performance concrete can be used for pouring a cored slab.

Description

technical field [0001] The invention belongs to the technical field of concrete components, and in particular relates to an ultra-high-performance concrete, an ultra-high-performance concrete hollow slab and a preparation method thereof. Background technique [0002] A building assembled on site by prefabricated components is called a prefabricated building. In recent years, with the country's strong support for prefabricated buildings, its proportion in construction has increased significantly. A large number of building parts of prefabricated buildings are produced and processed by the workshop. The main types of components are: exterior wall panels, interior wall panels, laminated panels, balcony / balcony partitions, air-conditioning panels, stairs, prefabricated beams, prefabricated columns, etc. Among them, the balcony partition mainly plays the role of decoration and partition, but because it is located on the lower balcony without support, the weight requirements are ...

AI Technical Summary

Problems solved by technology

However, due to the high viscosity and poor fluidity of the existing ultra-high performance concrete, it is difficult to flow freely in the pouring gap between the molds, which may easily cause defects and cavities during the pouring process; secondly, the surface of the existing ultra-high performance concrete is easy to Air-dried crust, the operation time of surface closing is only 1 hour, and its final setting time is more than 6 hours, which makes the hollow slab unable to close the surface smoothly like ordinary concrete in the later stage

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