3D-printable pva-basalt hybrid fiber high-toughness concrete and method of use

Abstract

The invention relates to PVA-basalt hybrid fiber high-toughness concrete capable of realizing 3D printing and a use method thereof. Through being metered in parts by weight, the concrete is preparedfrom the following ingredients including 0.8 to 1.2 parts of fast hardening ordinary Portland cement, 0.96 to 1.44 parts of grade F fly ash, 0.64 to 0.96 part of quartz sand (with the particle diameter range being 0.075 to 0.15mm), 0.29 to 0.43 part of water, 0.005 to 0.01 part of water reducing agents, 0.0017 to 0.0018 part of PVA fiber and 0.0043 to 0.0078 part of basalt fiber. According to thematerials of the concrete, the PVA fiber and the basalt fiber are used for optimizing and improving the intensity and the toughness of the concrete material; the printing performance is high; the intensity is high; the cost is low; the practical engineering application of the 3D printing concrete can be favorably promoted.

Description

technical field [0001] The invention belongs to the field of building materials, and in particular relates to a 3D-printable cement-based material, and more particularly to a 3D-printable PVA-basalt hybrid fiber high-toughness concrete material. Background technique [0002] In recent years, 3D printing technology has achieved remarkable development in the field of civil engineering. Examples of 3D printed bridges and 3D printed houses are often reported, which largely confirm the feasibility of applying 3D printing technology to the field of civil engineering. 3D printing concrete technology has also been widely concerned and promoted because of its many advantages such as design freedom, construction flexibility, fast construction speed, low labor cost, high degree of automation, and low environmental pollution. The preparation of 3D printable cement-based materials is the key to promote the application of this technology in engineering practice. However, the salient feat...

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Problems solved by technology

[0003] So far, although some researchers have formulated high-performance concrete that can be 3D printed, such as the Chinese patent application number 201610947297.1, which discloses a concrete for 3D printing, and the Chinese patent application number 201510375110.0, which discloses a concrete for 3D printing. High-performance powder concrete, the concrete contains 500-900 parts of cement, 145-230 parts of water, relatively low water content, and the obtained concrete has high strength and obvious brittleness; at the same time, some researchers have disclosed the use of PVA fibers to prepare Experimental methods for high-ductility cement-based materials, such as the Chinese patent application number 201310340652.5, disclose a rubber-high-ductility cement-based composite material and its preparation method. The composite material uses rubber powder instead of quartz sand, which is conducive to reaching a saturated cracking state. To enhance the deformation ability, cement is 100 parts, water is 55-125 parts, the water consumption is relatively high, and it is not suitable for 3D printing

Some of the existing cement-based materials have the characteristics of 3D printing, and some have the characteristics of high toughness and high ductility, but none of the cement-based materials has these two properties at the same time.

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