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A super-early-strength, high-ductility, low-shrinkage mortar and its preparation method

A high ductility and low shrinkage technology, applied in the field of fiber-reinforced cement-based composite materials, can solve the problems of durability, low early strength, large drying shrinkage, etc. Effect

Active Publication Date: 2022-03-29
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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  • A super-early-strength, high-ductility, low-shrinkage mortar and its preparation method
  • A super-early-strength, high-ductility, low-shrinkage mortar and its preparation method
  • A super-early-strength, high-ductility, low-shrinkage mortar and its preparation method

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 the parts by weight, and dry-stirring the 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 polycar...

Embodiment 3

[0035] Super early strength, high ductility and low shrinkage mortar includes the following components 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 water re...

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Abstract

The invention discloses a mortar with super early strength, high ductility and low shrinkage and a preparation method thereof. The mortar contains the following substances in parts by weight: 60-76 parts of sulphoaluminate cement, 4-12 parts of Portland cement, pulverized coal 20-28 parts of ash, 28-32 parts of fine aggregate, 18-24 parts of water, 1.5-2.0 parts of polyvinyl alcohol fiber. The preparation method comprises the following steps: a. dissolving the water reducer in water, adding pre-dispersed polyvinyl alcohol fibers to form a mixture; b. mixing sulphoaluminate cement, portland cement, powder Stir the coal ash and fine aggregate at a speed of 140-160r / min for 1-5min; c, slowly add 80-90wt% of the mixture, and stir at a speed of 180-200r / min for 3-6min; d, finally add the remaining 10‑20wt% mixture, stirred at a speed of 260‑290r / min for 2‑4min, and stirred evenly. The super-early-strength, high-ductility, and low-shrinkage mortar prepared by the invention satisfies the requirements of construction on its work performance while improving the early strength of the mortar, and optimizes service performance while improving construction efficiency.

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 Patents(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