High-performance mortar capable of effectively preventing mortar cracking and preparation method

A high-performance, mortar technology, applied in the field of building materials, can solve the problems of short setting time, low pumpability, poor flow performance, etc., to achieve the effect of ensuring concrete strength, slowing down hydration rate, and improving feasibility

Inactive Publication Date: 2021-12-03
怀化明达建材有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In the field of construction, as more and more attention is paid to the quality requirements of building construction, the performance requirements of concrete are also improved. Concrete admixtures have the characteristics of improving concrete performance, and more and more attention has been paid to engineering applications. Adaptability, proportioning, and mixing process will all affect the quality of the final concrete; for concrete, it has high slump leading to strength reduction, cracking due to drying shrinkage, short service life, poor fluidity, short setting time, and low pumpability. , The problem of easy crystallization at low temperature, the corresponding admixture can be selected, and a high-performance mortar can be prov

Method used

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  • High-performance mortar capable of effectively preventing mortar cracking and preparation method
  • High-performance mortar capable of effectively preventing mortar cracking and preparation method
  • High-performance mortar capable of effectively preventing mortar cracking and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The implementation of the present invention provides a kind of high-performance mortar that effectively prevents mortar from cracking and a preparation method thereof, and the specific implementation methods are as follows:

[0030] A high-performance mortar that effectively prevents mortar from cracking, comprising the following components by weight: 30-35 cement, 100-150 quartz sand, 0.5-1 retarder, 5-10 fly ash, 4-7 microsilica , 0.5-1 mineral powder, 1.5-4 water reducer, antifreeze 0.04.

[0031] The retarder is modified phosphogypsum.

[0032] The cement is ordinary Portland cement.

[0033] The water reducer is a naphthalene-based water reducer.

[0034] The ore powder is low-grade magnesite.

[0035] The antifreeze is calcium nitrite.

[0036] The preparation method of the high-performance mortar is as follows:

[0037] (1) Phosphogypsum pretreatment: Stir and mix 0.5 kg of phosphogypsum and 50 g of lime powder, place the mixture on a 400-mesh filter for gri...

Embodiment 2

[0047] Repeat the steps of Example 1:

[0048] (1) Phosphogypsum pretreatment: Stir and mix 0.8kg of phosphogypsum and 80g of lime powder, place the mixture on a 500-mesh filter for grinding and screening; obtain 500-mesh modified phosphogypsum; set aside.

[0049] (2) Grinding and screening 1 kg of low-grade magnesite to obtain 200 meshes of low-grade magnesite, then stirring and mixing the low-grade magnesite with 40 g of calcium nitrite; set aside.

[0050](3) Pour 32kg of cement, 120kg of quartz sand, 7kg of fly ash, 5kg of microsilica, a mixture of low-grade magnesite and nitrous acid, modified phosphogypsum, and 2.5kg of naphthalene-based water reducer; Mix in a mixer to get a high-performance mortar.

[0051] Get 12kg of the high-performance mortar prepared in Example 1 and 1.1kg of water for stirring and mixing to obtain concrete.

[0052] The concrete prepared in this embodiment has an initial setting time of 289 minutes and a final setting time of 403 minutes at ro...

Embodiment 3

[0058] Repeat the steps of Example 1:

[0059] (1) Phosphogypsum pretreatment: Stir and mix 1kg of phosphogypsum and 100g of lime powder, place the mixture on a 600-mesh filter for grinding and screening; obtain 600-mesh modified phosphogypsum; set aside.

[0060] (2) Grinding and screening 1 kg of low-grade magnesite to obtain 200 mesh of low-grade magnesite, then stirring and mixing the low-grade magnesite with 40 g of calcium nitrite; set aside.

[0061] (3) Pour 35kg cement, 150kg quartz sand, 10kg fly ash, 7kg microsilica fume, a mixture of low-grade magnesite and nitrous acid, modified phosphogypsum, and 4kg naphthalene-based water reducer; Mixed in the machine to get high-performance mortar.

[0062] Get 12kg of the high-performance mortar prepared in Example 1 and 1.1kg of water for stirring and mixing to obtain concrete.

[0063] The concrete prepared in this embodiment has an initial setting time of 302 minutes and a final setting time of 414 minutes at room temper...

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Abstract

The invention discloses high-performance mortar capable of effectively preventing mortar cracking and a preparation method. The high-performance mortar comprises the following components: cement, quartz sand, a retarder, fly ash, silica fume, mineral powder, a water reducing agent and an anti-freezing agent. The retarder is prepared from modified ardealite, and the mineral powder is low-grade magnesite; according to the invention, the mortar prepared in the invention is mixed with water to form concrete, the modified ardealite and the low-grade magnesite do not react with water, and have an expansion mechanism, so that the collapse degree of the concrete can be effectively reduced, and the problem of cracking of the concrete caused by dry shrinkage can be effectively solved; in addition, the silica fume is used as a blending agent, so that the strength and corrosion resistance of the concrete can be further improved, the low-grade magnesite and the phosphogypsum both belong to solid wastes in production and have the characteristics of sufficient quantity and difficulty in treatment, and the environment can be protected while the cost is reduced by utilizing the low-grade magnesite and the phosphogypsum.

Description

technical field [0001] The invention belongs to the field of building materials, and in particular relates to a high-performance mortar which can effectively prevent the mortar from cracking and a preparation method thereof. Background technique [0002] In the field of construction, as more and more attention is paid to the quality requirements of building construction, the performance requirements of concrete are also improved. Concrete admixtures have the characteristics of improving concrete performance, and more and more attention has been paid to engineering applications. Adaptability, proportioning, and mixing process will all affect the quality of the final concrete; for concrete, it has high slump leading to strength reduction, cracking due to drying shrinkage, short service life, poor fluidity, short setting time, and low pumpability. 1. For the problem of easy crystallization at low temperature, the corresponding admixture can be selected and prepared in a certain...

Claims

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Application Information

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IPC IPC(8): C04B28/04C04B22/14C04B22/10C04B103/22C04B111/34
CPCC04B28/04C04B22/144C04B22/10C04B2103/22C04B2111/343C04B14/06C04B18/08C04B18/146C04B2103/302C04B22/085
Inventor 庄平庄云明林爱平王武军
Owner 怀化明达建材有限公司
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