Sulfate-resistant concrete and construction method thereof

Abstract

The invention belongs to the field of hydraulic concrete, and in particular relates to sulfate-resistant concrete and a construction method thereof. By adjusting concrete mixing proportion additives of the sulfate-resistant concrete provided by the invention, the influence of powder granules of concrete aggregate and cement mixed gypsum powder to polycarboxylic acid can be eliminated, the situation that the pumping property and the working property of the concrete are affected by the 'fake curing' phenomenon of mixed concrete can be avoided, the working property of the sulfate-resistant concrete can meet standards of common concrete, and thus bubbles can be eliminated by using common methods when the sulfate-resistant concrete is molded. By adopting the construction method provided by the invention, as the mixing sequence that the gypsum powder cement slurry is stirred and mixed and the aggregate is added within a delayed time is adopted, the water delayed reaction phenomenon of the molded concrete can be reduced, and the situation that slurry discharged from the concrete cannot be easily broken as the concentrate of mortar is too high in the vibration process when the concrete is stirred and mixed in a normal material feeding sequence can be avoided.

Description

technical field [0001] The invention belongs to the field of hydraulic concrete, in particular to a sulfate-resistant concrete and a construction method thereof. Background technique [0002] The mechanism of sulfuric acid erosion of concrete is that sulfate penetrates into the concrete structure with water to crystallize and grow, or the main minerals chemically react with cement stones under certain conditions, causing erosion to hardened cement stones, and the formed sulfate double salt is deposited on the concrete. Pores and capillaries, and produce significant internal stress, resulting in concrete cracking. Sulfate (SO4 2- ) is a complex physical and chemical process that penetrates into the concrete structure from the outside to make the concrete performance gradually deteriorate. This process is affected by many factors, mainly including internal and external factors. The internal factors are the water-cement ratio, porosity, cement type and dosage of concrete. , a...

AI Technical Summary

Problems solved by technology

[0005] 1. After the concrete is mixed, the viscosity of the mortar is significantly greater than that of ordinary concrete, the fluidity and expansion of the concrete are relatively small, and the difficulty of concrete vibration is increased. The conventional vibration method cannot meet the compactness requirements; after strengthening the vibration, not only cannot meet the Density requirements, but also cause over-vibration to affect the strength of concrete;

[0006] 2. During the vibrating process of concrete, after the air bubbles rise from the interior of the concrete to the surface of the concrete, due to the high surface tension of the air bubbles, manual assistance is required to rupture, which not only increases the difficulty and cost of construction, but also cannot guarantee the construction quality;

[0007] 3. After the concrete is mixed, it is very easy to produce a "false setting" image. After it is left to stand for 5-10 minutes after mixing, the concrete slump will lose about 6cm, which seriously affects the construction speed of pumping concrete.

[0008] 4. When pouring concrete at the armpit corners of the inverted siphon bottom plate, due to the difficulty of artificial air entrainment, after several process improvements, there are still a large number of air bubbles and blisters in the concrete molding, which seriously affects the appearance quality of the concrete