3D-printable aeolian sand anti-freezing concrete as well as preparation method and use method thereof

A 3D printing, aeolian sand technology, applied in the field of concrete, can solve the problems of reducing the integrity of the concrete matrix, weakening the mechanical properties and durability of printing materials, etc., to achieve printability, pumpability, and viscosity reduction. Effect

Active Publication Date: 2022-04-08
HEBEI UNIV OF TECH +1
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0004] However, the concrete prepared by aeolian sand is used for 3D printing. The layer-by-layer molding method in the 3D printing process reduces the integrity of the concrete matrix, and inevitably introduces a certain amount of weak bonding surfaces and stacking voids, resulting in material failure. The mesoscopic heterogeneity and anisotropy will weaken the mechanical properties and durability of printing materials, especially the freeze-thaw resistance

Method used

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  • 3D-printable aeolian sand anti-freezing concrete as well as preparation method and use method thereof
  • 3D-printable aeolian sand anti-freezing concrete as well as preparation method and use method thereof
  • 3D-printable aeolian sand anti-freezing concrete as well as preparation method and use method thereof

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preparation example Construction

[0064] The present invention provides a method for preparing 3D-printable aeolian sand-resistant frost-resistant concrete described in the above scheme, comprising the following steps:

[0065] Mix Portland cement, silica fume, aeolian sand and fly ash to obtain a mixed material;

[0066] Mix the water reducer with the first part of water to obtain a water reducer solution;

[0067] mixing the cellulose ether, the starch ether and the second part of water to obtain a thickener solution;

[0068] Mixing the defoamer with the remaining water to obtain a defoamer solution;

[0069] The mixed material, the water reducer solution, the thickener solution, the defoamer solution and the polypropylene fiber are mixed to obtain the aeolian sand frost-resistant concrete which can be 3D printed.

[0070] The invention mixes Portland cement, silica fume, aeolian sand and fly ash to obtain a mixed material. In the present invention, there is no special limitation on the operation of mixi...

Embodiment 1

[0101] (1) In terms of parts by weight, 176 parts of Portland cement of grade 42.5, 8 parts of silica fume with a particle size of 6 μm to 8 μm, 16 parts of fly ash, and an apparent density of 2630 kg / cm 3 , bulk density 1400kg / cm 3 340 parts of wind-blown sand (after alkaline treatment) were mixed to obtain the mixed material; in parts by weight, 3 parts of polycarboxylate high-performance water reducer were mixed with 24 parts of water (the mass ratio of water reducer to water is 1:8), to obtain a water reducer solution; in parts by weight, mix 0.3 parts of hydroxyethyl cellulose ether with 15 parts of water (the mass ratio of cellulose ether to water is 1:50), and starch ether Mix 0.05 parts with 5 parts of water (the mass ratio of starch ether to water is 1:100), then mix the cellulose ether solution with the starch ether solution to obtain a thickener solution; in parts by weight, polyether modified organic Mix 0.3 parts of silicon type defoamer with 18 parts of water (t...

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Abstract

The invention provides 3D-printable aeolian sand anti-freezing concrete as well as a preparation method and a use method thereof, and belongs to the technical field of concrete. The aeolian sand anti-freezing concrete capable of 3D printing provided by the invention is prepared from the following preparation raw materials in parts by weight: 166-186 parts of Portland cement not lower than 42.5 grade; 3 to 13 parts of silica fume; 6 to 16 parts of fly ash; 330 to 350 parts of aeolian sand; 1-5 parts of a water reducing agent; 0.1 to 1.5 parts of cellulose ether; 0.05 to 0.5 part of starch ether; 0.1 to 1.5 parts of a defoaming agent; 0.2 to 4 parts of polypropylene fiber; 60 to 75 parts of water; the aeolian sand is aeolian sand subjected to alkali treatment. The aeolian sand anti-freezing concrete provided by the invention not only can realize 3D printing, but also is excellent in mechanical property and durability, and the conditions of shortage of natural sand and abundant aeolian sand resources in desert areas are adjusted according to local conditions, and local materials are used.

Description

technical field [0001] The invention relates to the technical field of concrete, in particular to a 3D-printable aeolian sand-resistant concrete and a preparation method and application method thereof. Background technique [0002] In recent years, concrete 3D printing (3DCP), as a new type of intelligent additive construction technology, has received widespread attention from all over the world, and has achieved many achievements in the construction of landscape sketches, infrastructure and building structures. An effective way to automate and automate. Compared with the traditional construction technology, 3DCP has the advantages of no mold, less consumables, high degree of design freedom, short construction period, and low labor demand. It has great application prospects in engineering construction in remote areas. Especially in desert areas, the infrastructure construction in this area has always been constrained by the harsh construction environment and high labor dema...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04C04B18/14C04B18/08C04B14/06C04B20/02C04B24/38B33Y70/10B33Y80/00B33Y10/00C04B111/76
CPCY02W30/91
Inventor 马国伟胡元元王里李荣马慧
Owner HEBEI UNIV OF TECH
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