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A kind of engineering cement-based composite material and preparation method thereof

A composite material and cement-based technology, which is applied in the direction of clay preparation equipment, cement mixing equipment, chemical instruments and methods, etc., can solve the problems of small fineness modulus and unseen application of aeolian sand, so as to improve performance and ensure Ductility and high toughness, the effect of improving the dispersion effect

Active Publication Date: 2020-03-31
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Due to the characteristics of fine particle size and small fineness modulus of aeolian sand, the current research on aeolian sand in concrete is limited. ECC fine aggregates are mainly river sand or quartz sand, and aeolian sand is mainly used in ECC. Apps in not yet seen

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] An environment-friendly engineering cement-based composite material, comprising the following components in parts by weight:

[0039] Ordinary Portland cement 780 parts, slag 750 parts, silica fume 150 parts, expansion agent 23.3 parts, aeolian sand 500 parts, PE fiber 20 parts, polycarboxylate superplasticizer 25 parts, water 230 parts.

[0040] Preparation:

[0041] (1) Moisten the mixer and the tools used.

[0042] (2) Add the weighed cement, slag, silica fume, expansion agent, aeolian sand and PE fiber into the mixing container of the mixer in turn, cover the mixer container, start the rotor and the mixing container, and the counterclockwise rotation speed of the rotor is 150r / min, the clockwise rotation speed of the mixing container is 30r / min, and the rotation direction of the rotor is opposite to that of the mixing container. The mixing time is 120S, so that it is stirred and mixed evenly to obtain a mixture.

[0043] (3) Add the weighed polycarboxylate high-e...

Embodiment 2

[0045]An environment-friendly engineering cement-based composite material, comprising the following components in parts by weight:

[0046] Ordinary Portland cement 750 parts, slag 720 parts, silica fume 120 parts, expansion agent 18 parts,

[0047] 430 parts of aeolian sand, 18 parts of PE fiber, 22 parts of polycarboxylate superplasticizer, and 220 parts of water.

[0048] Preparation:

[0049] (1) Moisten the mixer and the tools used.

[0050] (2) Add the weighed cement, slag, silica fume, expansion agent, aeolian sand and PE fiber into the mixing container of the mixer in turn, cover the mixer container, start the rotor and the mixing container, and the counterclockwise rotation speed of the rotor is 130r / min, the clockwise rotation speed of the mixing container is 20r / min, and the rotation direction of the rotor is opposite to that of the mixing container. The mixing time is 100S, so that it is stirred and mixed evenly to obtain a mixture.

[0051] (3) Add the weighed...

Embodiment 3

[0053] An environment-friendly engineering cement-based composite material, comprising the following components in parts by weight:

[0054] Ordinary Portland cement 810 parts, slag 780 parts, silica fume 180 parts, expansion agent 28 parts,

[0055] 530 parts of aeolian sand, 22 parts of PE fiber, 28 parts of polycarboxylate superplasticizer, and 235 parts of water.

[0056] Preparation:

[0057] (1) Moisten the mixer and the tools used.

[0058] (2) Add the weighed cement, slag, silica fume, expansion agent, aeolian sand and PE fiber into the mixing container of the mixer in turn, cover the mixer container, start the rotor and the mixing container, and the counterclockwise rotation speed of the rotor is 170r / min, the clockwise rotation speed of the mixing container is 40r / min, and the rotation direction of the rotor is opposite to that of the mixing container. The mixing time is 140S, so that it is stirred and mixed evenly to obtain a mixture.

[0059] (3) Add the weighe...

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Abstract

The invention discloses an environment-friendly engineering cement based composite material and a preparation method therefor. The composite material is mainly prepared from the following raw materials in parts by weight: 750-810 parts of ordinary Portland cement, 720-780 parts of slag, 120-180 parts of silica fume, 18-28 parts of expanding agent, 430-530 parts of wind-drift sand, 18-22 parts of PE fibers, 22-28 parts of polycarboxylic acid water reducing agent and 220-235 parts of water. Compared with the prior art, the engineering cement based composite material and the preparation method therefor have the advantages that the environment-friendly engineering cement based composite material is prepared by replacing the traditional river sand with the wind-drift sand and combining the PE fibers, thus, the compressive strength of products is equivalent to that of ECC adopting the river sand as fine aggregates, the high ductility and high toughness can be guaranteed, and the wind-drift sand can be changed into the valuable from the waste. In addition, a counter-current principle or cross-current principle is utilized, and a rotary type mixing stirrer is adopted, so that the dispersion effect of the PE fibers during stirring is greatly improved, and the mechanical properties of the engineering cement based composite material can be remarkably improved.

Description

technical field [0001] The invention relates to an environment-friendly engineering cement-based composite material and a preparation method thereof, belonging to the technical field of engineering cement-based composite materials. Background technique [0002] With the rapid development of various super high-rise and long-span structures, traditional concrete has been unable to meet the needs of complex projects due to its shortcomings such as high brittleness and easy cracking, so various new building materials have emerged as the times require. The engineering cement-based composite material ECC was born in the 1990s. The constituent materials are composed of cement, sand and mineral admixtures to form a matrix, and short fibers are used as reinforcements. Different from ordinary concrete, the incorporation of flexible fibers makes ECC have high ductility and high toughness, and it can exhibit strain hardening behavior and multi-slit cracking characteristics under tension...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/04B28C5/40
CPCB28C5/402C04B28/04C04B2111/00017C04B18/141C04B18/146C04B14/068C04B2103/302C04B16/0625
Inventor 蒋金洋冯滔滔王凤娟周文静王立国许光远褚洪岩武胜萍
Owner SOUTHEAST UNIV