Low-temperature-rise anti-corrosion maritime mass concrete and preparation method thereof

Abstract

The invention discloses low-temperature-rise anti-corrosion maritime mass concrete. The low-temperature-rise anti-corrosion maritime mass concrete is prepared from cement, coal ash, mineral powder, broken stones, river sand, a hydrophobic pore-blocking ingredient (HPI), a hydration promotional reagent, an efficient slow-release water curing agent and water in a certain ratio. The low-temperature-rise anti-corrosion maritime mass concrete disclosed by the invention has the advantages that a disperse group of the hydration promotional reagent is utilized for fully dispersing gel material particles, the hydration rate and utilization rate of the gel material particles are effectively improved, the cement usage amount is reduced by about 10%, hydration adiabatic temperature rise of the mass concrete is lowered, production of temperature cracks is avoided, and the durability is improved; and the efficient slow-release water curing agent with water retention, water release and controllable and delayed expansion properties is adopted, so that the interior humidity of the concrete is guaranteed, and volume shrinkage deformation produced by cementitious paste hydration reaction in the concrete is compensated. The obtained maritime mass concrete has low temperature rise, low shrinkage, high anti-permeability and corrosion resisting properties and has important practical application values.

Description

technical field [0001] The invention belongs to the field of building materials, and in particular relates to a low-temperature rise corrosion-resistant marine mass concrete and a preparation method thereof. Background technique [0002] In recent years, with the growing national economy and international influence of our country, in order to meet the traffic needs of crossing seas and rivers, there are more and more super-large bridges and building components. In order to meet the structural bearing capacity, volume stability, and durability The size of the components is often larger, and the size of the concrete matching the components is also getting larger and wider, and the application is becoming more and more extensive. The application of large-volume concrete in marine engineering has also attracted widespread attention. The large-volume concrete of marine engineering is served in the marine environment. - , Mg 2+ , SO 4 2- Plasma erosion, harsh conditions. If ...

AI Technical Summary

Problems solved by technology

If cracks occur in the large-volume concrete of marine engineering, the anti-corrosion performance will be seriously reduced, and the erosive ions will accelerate the intrusion into the concrete, seriously affecting the safety and durability of the concrete structure

[0003] At present, there are the following problems in marine mass concrete: (1) The existing "Construction Specifications for Mass Concrete" and "Concrete Construction Specifications for Water Transport Engineering" have inconsistent regulations on the amount of mineral admixtures, and the specified amount of cement is relatively high, resulting in The hydration heat release of concrete is large, the adiabatic temperature rises, the shrinkage is large, and cracks are prone to occur under the coupled effects of shrinkage deformation and temperature stress, which affects the durability of concrete; (2) Marine large-volume concrete has high durability requirements, while ordinary low Due to the small amount of cement and low-gelling materials used in marine large-volume concrete, although it can reduce the adiabatic temperature rise of concrete and reduce cracking, the interior of the concrete has many voids and is not dense, and corrosive ions are easy to invade the interior, resulting in durability. (3) The hydration rate of cement in marine mass concrete is only 70% to 85%, and the activity of mineral admixtures such as fly ash and mineral powder has not been effectively stimulated

It is the existence of these problems that largely affects the long-term durability of marine mass concrete and reduces its service life.

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