Low-shrinkage alkali-activated cementing material and preparation method thereof

A cementitious material, low shrinkage alkali technology, applied in cement production and other directions, can solve the problems of reduced relative humidity, reduced free moisture, large autogenous shrinkage, etc., to reduce early autogenous shrinkage, improve compressive strength, and small autogenous shrinkage. Effect

Inactive Publication Date: 2020-12-22
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can effectively utilize the industrial by-product slag, and the production process is simple, the energy consumption is small, the consumption of natural resources is small, and the emission of carbon dioxide is small (about 10% of the emission of ordinary Portland cement). If the rate is too fast, the internal free moisture will decrease, resulting in a decrease in internal relative humidity, and the increase in negative pressure in the pores will cause volume changes, resulting in large early self-shrinkage and cracking
Therefore, the early self-shrinkage of alkali-excited cementitious materials limits its application in the field of construction to a certain extent.

Method used

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  • Low-shrinkage alkali-activated cementing material and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0027] A low-shrinkage alkali-activated pulp cleaning material, the specific preparation method steps are as follows:

[0028] 1) Take by weight 200 parts of fly ash, 600 parts of mineral powder, biomass incineration ash (rice husk ash, pore size 8-56nm, SiO 2 The content is 87.2%, Na 2 O and K 2 O total content 18%) 200 parts, put into ball mill together and carry out ball milling, make specific surface area reach 0.298m 2 / g, to obtain the gelled material;

[0029] 2) Add 139 parts of alkali activator (obtained by mixing industrial water glass and sodium hydroxide, with a modulus of 1.0), 6 parts of water reducer and 320 parts of water into 1000 parts of gelling material obtained in step 1), the water-binder ratio 0.4, slowly stirred at a speed of 140±5r / min for 30s, then stirred rapidly at a speed of 285±5r / min for 60s to obtain a low-shrinkage alkali-activated cementitious material slurry;

[0030] 3) Place the low-shrinkage alkali-activated gelling material slurry obt...

Embodiment 2

[0032] A low-shrinkage alkali-activated pulp cleaning material, the specific preparation method steps are as follows:

[0033] 1) Take by weight 100 parts of fly ash, 700 parts of mineral powder, biomass incineration ash (peanut shell ash, pore size 5-50nm, SiO 2 The content is 85.3%, Na 2 O and K 2 O total content 18%) 200 parts, put into ball mill together and carry out ball milling, make specific surface area reach 0.312m 2 / g, get the gelling material;

[0034] 2) 139 parts of alkali activators (obtained by mixing industrial water glass and sodium hydroxide, the modulus is 1.0, the dosage of water glass is Na 2 O is calculated as 3% of the amount of gelling material), 7 parts of water reducer and 320 parts of water are added to 1000 parts of gelling material obtained in step 1), the water-binder ratio is 0.4, and the speed is 140 ± 5r / min Stir slowly for 30s , and then stir rapidly at a speed of 285±5r / min for 60s to obtain a low-shrinkage alkali-activated cementitious...

Embodiment 3

[0037] A low-shrinkage alkali-activated pulp cleaning material, the specific preparation method steps are as follows:

[0038] 1) Weigh 100 parts of fly ash, 800 parts of mineral powder, biomass incineration ash (wheat straw ash, pore size 6-52nm, SiO 2 The content is 86.5%, Na 2 O and K 2 O total content 18%) 100 parts, put into ball mill together and carry out ball milling, make specific surface area reach 0.336m 2 / g, to obtain the gelled material;

[0039] 2) 139 parts of alkali activators (obtained by mixing industrial water glass and sodium hydroxide, the modulus is 1.0, the dosage of water glass is Na 2 O is calculated as 3% of the amount of the gelling material), 8 parts of water reducer and 320 parts of water are added to 1000 parts of the gelling material obtained in step 1), the water-binder ratio is 0.4, and slowly stirred at a speed of 140±5r / min for 30s , and then stir rapidly at a speed of 285±5r / min for 60s to obtain a low-shrinkage alkali-activated cementi...

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Abstract

The invention discloses a low-shrinkage alkali-activated cementing material and a preparation method thereof. The low-shrinkage alkali-activated cementing material is obtained by mixing and ball-milling fly ash, mineral powder and biomass incineration ash. The low-shrinkage alkali-activated cementing material comprises the following components in parts by mass: 100-200 parts of the fly ash, 600-800 parts of the mineral powder and 100-200 parts of the biomass incineration ash, totaling 1000 parts. Compared with a common alkali-activated cementing material, the alkali-activated cementing material provided by the invention has the advantages of high strength, small self-shrinkage and the like, and various performance indexes of the alkali-activated cementing material meet use requirements onthe cementing material.

Description

technical field [0001] The invention belongs to the technical field of building materials, and relates to a low-shrinkage alkali-activated gelling material and a preparation method thereof. Background technique [0002] Alkali-activated gelling material is a new type of gelling material mixed with finely ground water-quenched blast furnace slag and alkaline activator. Compared with ordinary Portland cement, the alkali-activated slag cementitious material has excellent properties such as low heat of hydration, fast development of mechanical properties, and good durability, and has become one of the cementitious materials to replace Portland cement. It can effectively utilize the industrial by-product slag, and the production process is simple, the energy consumption is small, the consumption of natural resources is small, and the emission of carbon dioxide is small (about 10% of the emission of ordinary Portland cement). If the rate is too fast, the internal free moisture wi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B7/28C04B7/26C04B7/14C04B12/00C04B28/00
CPCC04B7/14C04B7/26C04B7/28C04B12/005C04B28/006C04B2111/00017C04B2201/50C04B2103/302C04B22/062C04B12/04Y02P40/10
Inventor 李相国许金生吕阳蹇守卫姜东兵何晨昊蒋文广
Owner WUHAN UNIV OF TECH
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