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Ultra-early-strength high-ductility low-shrinkage mortar and preparation method thereof

A technology with high ductility and low shrinkage, applied in the field of fiber-reinforced cement-based composite materials, can solve problems such as low early strength, lack of advantages, and durability problems, and achieve the goals of improving early strength, optimizing service performance, and optimizing particle gradation Effect

Active Publication Date: 2019-11-15
SOUTHEAST UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In practical engineering applications, the early strength of traditional ECC is low, and it needs a long period of maintenance to reach the design strength, and because it does not contain coarse aggregate, it will cause excessive drying shrinkage and related durability problems. There is no advantage in projects with high early strength requirements

Method used

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  • Ultra-early-strength high-ductility low-shrinkage mortar and preparation method thereof
  • Ultra-early-strength high-ductility low-shrinkage mortar and preparation method thereof
  • Ultra-early-strength high-ductility low-shrinkage mortar and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Super early strength, high ductility and low shrinkage mortar includes the following components by weight: 60 parts of sulfoaluminate cement, 4 parts of Portland cement, 24 parts of fly ash, 32 parts of fine aggregate, 20 parts of water, polyethylene 1.9 parts of alcohol fiber, 0.6 parts of polycarboxylate water reducer.

[0022] Concrete preparation method comprises the following steps:

[0023] Step 1, dissolving polycarboxylate water reducer in water, adding predispersed polyvinyl alcohol fibers to form a mixture;

[0024] Step 2, weighing each component according to parts by weight, dry mixing sulphoaluminate cement, Portland cement, fly ash and fine aggregate at a speed of 140r / min for 2min;

[0025] Step 3, slowly add 80wt% of water in which all the water reducer is dissolved, and wet stir at a speed of 190r / min for 3min to form a uniform slurry;

[0026] Step 4: Finally, add the remaining 20wt% of the water in which the polycarboxylate-based water reducer is di...

Embodiment 2

[0028] Super early strength, high ductility and low shrinkage mortar includes the following components in parts by weight: 64 parts of sulfoaluminate cement, 8 parts of Portland cement, 28 parts of fly ash, 28 parts of fine aggregate, 18 parts of water, polyethylene 1.6 parts of alcohol fiber, 0.75 parts of polycarboxylate water reducer.

[0029] Concrete preparation method comprises the following steps:

[0030] Step 1, dissolving polycarboxylate water reducer in water, adding predispersed polyvinyl alcohol fibers to form a mixture;

[0031] Step 2, weighing each component according to parts by weight, dry mixing sulphoaluminate cement, Portland cement, fly ash and fine aggregate at a speed of 150r / min for 4min;

[0032] Step 3, slowly add 85wt% of water dissolved in polycarboxylate-based water reducer, and wet stir for 5 minutes at a speed of 185r / min to form a uniform slurry;

[0033] Step 4: Finally, add the remaining 15wt% of the water in which the polycarboxylate-based...

Embodiment 3

[0035] Super early strength, high ductility and low shrinkage mortar includes the following components in parts by weight: 76 parts of sulfoaluminate cement, 10 parts of Portland cement, 20 parts of fly ash, 31 parts of fine aggregate, 22 parts of water, polyethylene 1.8 parts of alcohol fiber, 0.5 parts of polycarboxylate water reducer.

[0036] Concrete preparation method comprises the following steps:

[0037] Step 1, dissolving polycarboxylate water reducer in water, adding predispersed polyvinyl alcohol fibers to form a mixture;

[0038] Step 2, weighing each component according to parts by weight, dry mixing sulphoaluminate cement, Portland cement, fly ash and fine aggregate at a speed of 140r / min for 2min;

[0039] Step 3, slowly add 88wt% of water dissolved in polycarboxylate-based water reducer, and wet stir for 5 minutes at a speed of 185r / min to form a uniform slurry;

[0040] Step 4: Finally, add the remaining 12wt% of the water in which the polycarboxylate-based...

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Abstract

The invention discloses ultra-early-strength high-ductility low-shrinkage mortar and a preparation method thereof. The mortar comprises the following substances in parts by weight: 60-76 parts of sulphoaluminate cement, 4-12 parts of Portland cement, 20-28 parts of fly ash, 28-32 parts of fine aggregate, 18-24 parts of water and 1.5-2.0 parts of polyvinyl alcohol fibers. The preparation method comprises the following steps: a, dissolving a water reducing agent in water, and adding pre-dispersed polyvinyl alcohol fibers to form a mixture; b, stirring the sulphoaluminate cement, the Portland cement, the fly ash and the fine aggregate according to the weight ratio for 1-5 minutes at the rotating speed of 140-160 r / min; c, slowly adding 80-90wt% of the mixture, and carrying out stirring for 3-6min at a rotating speed of 180-200r / min; and d, finally adding the rest 10-20wt% of the mixture, carrying out stirring for 2-4 minutes at a rotating speed of 260-290 r / min, and carrying out uniform stirring. The mortar prepared by the method has the advantages of ultra-early strength, high ductility and low shrinkage, requirements of construction on working performance of the mortar is met whileearly strength of the mortar is improved, and service performance is optimized while construction efficiency is improved.

Description

technical field [0001] The invention relates to a fiber-reinforced cement-based composite material, in particular to a super-early-strength, high-ductility, low-shrinkage mortar and a preparation method thereof. Background technique [0002] Traditional mortar is prone to brittle failure, low tensile strength, and poor ductility. Its inherent defects shorten the service life of the structure and limit the application range of the material. Engineering fiber reinforced cementitious composite (ECC) is a new type of building material designed based on the analysis of the mechanical behavior of fibers, matrix and interface based on mesomechanics. It can produce elastic properties similar to steel when stretched. Plastic deformation behavior, the ultimate tensile strain can reach more than 3%, which can well solve the problems of brittle cracking in traditional cement-based materials such as mortar. In practical engineering applications, the early strength of traditional ECC is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/06
CPCC04B28/06C04B2201/50C04B2201/05C04B7/02C04B18/08C04B14/06C04B16/0641C04B2103/302
Inventor 潘金龙姜波钱臻旭童浩陈思鹏
Owner SOUTHEAST UNIV
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