Liquid fine-expansion pumping agent

Abstract

The invention discloses a liquid micro-expansion pumping agent, comprising the following compositions, in weight percent: polymethylnaphthalene sodium sulfonate: 50 percent to 60 percent; dispersing agent: 5 percent to 10 percent; retarder: 10 percent to 20 percent; initiator: 4 percent to 6 percent; and water: 15 percent to 20 percent. The pumping agent adopts an organosilicon material as an expansion component and utilizes the silanization technique in the organosilicon industry to make silicane have reaction with an active group of a basic material and substitute active hydrogen on an organic molecule, when the silicane is in reaction with tricalcium aluminate, part of hydrogen can be released a plurality of hours later so as to form micro air bubbles in a cement paste, diameters of general air holes are under 0.1mm, thereby the concrete can produce the volume micro-expansion for compensating the volumetric shrinkage of concrete at the stage, in particular to the early-age plastic shrinkage in the high fluidity pumping concrete, so as to reduce plastic cracks.

Description

【Technical field】 [0001] The invention relates to an adjuvant for concrete in the construction field, in particular to a liquid micro-expansion pumping agent. 【Background technique】 [0002] With the vigorous development of my country's capital construction and construction industry, high-rise and super-high-rise buildings, high-grade highways, bridges and large-span structures are increasing, especially the popularity of commercial concrete, and the concrete pouring of large-scale projects has mostly used pumps. Delivery construction. Since the pumped concrete requires greater fluidity and cohesion, the relative sand ratio in the mix ratio is too large, the stone particle size is too small, and the cementing material and water consumption increase accordingly, so the volume shrinkage is relatively large, so The phenomenon of cracking in pumped concrete due to shrinkage is much more than that in concrete constructed by ordinary method, and the most obvious one is early plast...

AI Technical Summary

Problems solved by technology

2.0-3.0×10 after three to fourteen days -4 Therefore, it can only have a certain compensation effect on the late shrinkage of concrete, and has no effect on shrinkage and crack control in the plastic stage.

Images