Abrasion resistant low-heat portland cement

Abstract

The invention relates to abrasion resistant low-heat portland cement which is prepared from a low-heat portland cement clinker, an abrasion resistant mixed material and a proper amount of gypsum. The abrasion resistant low-heat portland cement comprises the following components by weight percent: 85-98% of the low-heat portland cement clinker, 2-10% of the abrasion resistant mixed material and 1-10% of the gypsum, wherein the abrasion resistant mixed material is mainly prepared from active micro-silicon powder, ultrafine low calcium coal ash and a proper amount of superplasticizer. The abrasion resistant low-heat portland cement provided by the invention has no crazing phenomenon, abrasion loss caused by the fact that concrete pushes or laminates substances is reduced, and the resistance to concrete damage generated by acting on sand inclusion and stone water flow is improved; and the abrasion resistant low-heatportland cement has the characteristics of low hydration heat, small dry shrinkage, good durability and excellent abrasion resistance, and the concrete is prepared just according to concrete design requirement so as to meet the abrasion resistant requirement on engineering parts with high concrete abrasion resistant requirement in the water and electricity fields such as diversion tunnels, spillway tunnels, dams, airfield runways and the like.

Description

technical field [0001] The invention relates to an anti-abrasion low-heat portland cement. Background technique [0002] For a long time, the impact and wear resistance of mass concrete has been the bottleneck of concrete engineering application. Moreover, due to the adiabatic temperature rise caused by the heat of hydration, the wear resistance of concrete after cracking further decreases. Many large-volume concretes used in hydraulic engineering, airport construction, highways and other fields have extensive wear and tear, which not only brings Huge maintenance and reinforcement costs also lead to many unsafe factors. [0003] At present, in hydropower projects and other projects that require high wear resistance of concrete, in order to improve the wear resistance of concrete, it is mainly by adding some wear-resistant components when preparing concrete, such as adding silicon powder, iron slag or adjusting the concrete mix ratio, etc. The method, the basic principle is...

AI Technical Summary

Problems solved by technology

Among these methods, when preparing concrete, the addition of silica fume will inevitably cause admixtures such as adsorption superplasticizers, which will easily cause construction difficulties. Others such as adding iron slag and adjusting the concrete mix ratio cannot fundamentally solve the problem. wear resistance problem

In order to reduce concrete cracks, expansion agents are usually added to control the volume stability of concrete when preparing concrete. At the same time, high-volume mineral admixtures are used instead of cement to reduce the heat of hydration and reduce temperature stress cracks. It is often difficult to cooperate with each other in place, and finally It has not fundamentally solved the problem of anti-cracking, nor has it demonstrated a good anti-erosion effect, resulting in high repair costs in later projects and affecting many problems such as engineering use.

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