Steam-curing-free ultrahigh-performance concrete manhole cover as well as preparation method thereof

Abstract

The invention discloses a steam-curing-free ultrahigh-performance concrete manhole cover as well as a preparation method thereof. The steam-curing-free ultrahigh-performance concrete manhole cover comprises an ultrahigh-performance concrete body and a reinforcement framework, wherein the ultrahigh-performance concrete body is prepared from the following stepsraw materials: river sand, high-activity low-shrinkage admixture, mineral powder, cement, a high-activity molecular activated catalyst, awater reducer, steel fibers and water. The invention also discloses a method for preparing the steam-curing-free ultrahigh-performance concrete manhole cover. By adopting a normal-temperature maintenance way, the process is simple, and the production cost and energy consumption can be reduced. The ultrahigh-performance concrete manhole cover prepared by adopting the normal-temperature maintenance way is excellent in performance, excellent in anti-permeability, anti-frozen-molten performance, corrosion resistance, high temperature resistance, erosion resistance and the like.

Description

technical field [0001] The invention belongs to manhole inspection well covers or similar covers, and relates to an ultra-high-performance concrete inspection well cover and a preparation method thereof, in particular to a D400-grade ultra-high-performance concrete inspection well cover without steam curing and a preparation process thereof. Background technique [0002] A manhole cover is a closure on top of an entrance to an underground facility. All underground pipelines of public facilities such as water supply and drainage, communication, electricity, gas, heat, and fire protection must be provided with inspection wells and inspection well covers. The inspection manhole cover is composed of a manhole cover and a well seat. When used on the road, it will be frequently crushed and impacted by motor vehicles. Therefore, the inspection manhole cover requires high structural strength and impact resistance; if the manhole cover is damaged or lost, it will seriously endanger p...

AI Technical Summary

Problems solved by technology

Although various measures are taken to prevent theft, such as installing manhole cover anti-theft locks, anti-theft chains, anti-theft hinges or concealed manhole covers, etc., none of them can fundamentally eliminate the problem of the loss of cast iron manhole covers

[0004] Patents CN201520565823.9, CN201510460789.3, CN201520716063.7, CN201510588393.7, and CN201710071364.2 have published D400-grade ultra-high performance concrete inspection manhole covers, although materials with low recycling value can effectively solve the problem of lost cast iron manhole covers. Both use steam or hot water curing methods to maintain the ultra-high performance concrete inspection manhole cover. The investment in maintenance equipment is large, the energy consumption is high, and the production cost is high. Compared with the cast iron inspection manhole cover, the cost performance advantage is not obvious.

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