A kind of self-compacting concrete admixture and preparation method thereof

Abstract

The invention discloses a self-compacting concrete admixture, which comprises the following components: a volume stabilizing component, a water-reducing component, a lubricating component, an air-entraining component, an anti-segregation component, a defoaming component, and a dispersing component. The volume stabilizing components include volume stabilizing components in the middle period before cement hardening and volume stabilizing components in the middle and late stages of cement hardening. Use one or a combination of diisopropyl azodicarboxylate and diethyl azodicarboxylate to compound with polyoxyethylene sorbitan fatty acid oleate and nano-zinc oxide to stabilize the volume of cement in the middle period before hardening, combining Light-burned magnesia, light-burned calcium oxide or anhydrous calcium sulfoaluminate can keep the volume stable in the middle and late stage of cement hardening to realize the volume stability of self-compacting concrete in the whole hardening cycle, and cooperate with other components to greatly improve the flow filling capacity of self-compacting concrete, realizing Excellent filling adhesion, improve the smoothness of concrete surface and reduce surface defects. It can also effectively prevent cracks.

Description

technical field

[0001] The invention belongs to a concrete admixture, in particular to a self-compacting concrete admixture and a preparation method thereof. Background technique

[0002] At present, my country's concrete admixture industry is in a stage of rapid development. In order to meet the new technology and new requirements of concrete pouring, new functional requirements are also put forward for concrete admixtures. With the scarcity of senior concrete pouring skilled workers, the labor cost of concrete pouring construction has gradually increased, and construction companies have continuously improved the efficiency and quality of concrete pouring construction, which has put forward functional requirements for concrete self-compacting. However, the current water-reducing admixtures cannot satisfy the self-compacting properties of concrete, so special self-compacting concrete admixtures are required.

[0003] Chinese Patent No. CN201810824610.1 discloses a self-comp...

Examples

Embodiment 1

[0040] This embodiment provides a self-compacting concrete admixture, comprising the following components by mass percentage: 25% of volume stabilization component, 0.4% of water-reducing component, 50% of lubricating component, 0.4% of air-entraining component, and 24% of anti-segregation component %, defoaming component 0.1%, dispersing component 0.1%;

[0041] The volume-stabilizing component includes a volume-stabilizing component in the early and middle stages of cement hardening, and a volume-stabilizing component in the middle and late stages of cement hardening; Sorbitol fatty oleate and nano-zinc oxide are compounded, and the mass ratio of the diisopropyl azodicarboxylate to polyoxyethylene sorbitan fatty oleate and nano-zinc oxide is 100:1:10; The anti-segregation component is nano-silica.

[0042] The water-reducing component is a polycarboxylate water-reducing component.

[0043] The lubricating component is composed of microbead fly ash and glass microbeads in a...

Embodiment 2

[0053] This embodiment provides a self-compacting concrete admixture, which is different from Embodiment 1 in that the diisopropyl azodicarboxylate, polyoxyethylene sorbitan fatty oleate and nano-zinc oxide The mass ratio of 200:3:15.

[0054] The self-compacting concrete admixture was prepared by the preparation method described in Example 1.

Embodiment 3

[0056] This embodiment provides a self-compacting concrete admixture. Compared with Embodiment 1, the difference is that the anti-segregation components are nano-silica, hydrotalcite and water-soluble polymer compound in a mass ratio of 1:1 :1 is compounded.

[0057] The self-compacting concrete admixture was prepared by the preparation method described in Example 1.

technical field

[0001] The invention belongs to a concrete admixture, in particular to a self-compacting concrete admixture and a preparation method thereof. Background technique

[0002] At present, my country's concrete admixture industry is in a stage of rapid development. In order to meet the new technology and new requirements of concrete pouring, new functional requirements are also put forward for concrete admixtures. With the scarcity of senior concrete pouring skilled workers, the labor cost of concrete pouring construction has gradually increased, and construction companies have continuously improved the efficiency and quality of concrete pouring construction, which has put forward functional requirements for concrete self-compacting. However, the current water-reducing admixtures cannot satisfy the self-compacting properties of concrete, so special self-compacting concrete admixtures are required.

[0003] Chinese Patent No. CN201810824610.1 discloses a self-comp...

Examples

Embodiment 1

[0040] This embodiment provides a self-compacting concrete admixture, comprising the following components by mass percentage: 25% of volume stabilization component, 0.4% of water-reducing component, 50% of lubricating component, 0.4% of air-entraining component, and 24% of anti-segregation component %, defoaming component 0.1%, dispersing component 0.1%;

[0041] The volume-stabilizing component includes a volume-stabilizing component in the early and middle stages of cement hardening, and a volume-stabilizing component in the middle and late stages of cement hardening; Sorbitol fatty oleate and nano-zinc oxide are compounded, and the mass ratio of the diisopropyl azodicarboxylate to polyoxyethylene sorbitan fatty oleate and nano-zinc oxide is 100:1:10; The anti-segregation component is nano-silica.

[0042] The water-reducing component is a polycarboxylate water-reducing component.

[0043] The lubricating component is composed of microbead fly ash and glass microbeads in a...

Embodiment 2

[0053] This embodiment provides a self-compacting concrete admixture, which is different from Embodiment 1 in that the diisopropyl azodicarboxylate, polyoxyethylene sorbitan fatty oleate and nano-zinc oxide The mass ratio of 200:3:15.

[0054] The self-compacting concrete admixture was prepared by the preparation method described in Example 1.

Embodiment 3

[0056] This embodiment provides a self-compacting concrete admixture. Compared with Embodiment 1, the difference is that the anti-segregation components are nano-silica, hydrotalcite and water-soluble polymer compound in a mass ratio of 1:1 :1 is compounded.

[0057] The self-compacting concrete admixture was prepared by the preparation method described in Example 1.