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A modified alkali-activated gelling material and its preparation method

A cementitious material and alkali excitation technology, applied in the field of composite materials, can solve the problems of limited improvement in the bonding strength and toughness of waste rubber powder and rubber particles, difficult to uniformly disperse fibers, and limited scope of use. Good acid and alkali corrosion resistance, convenient product storage, and enhanced safety effects

Active Publication Date: 2017-10-24
SUZHOU CONCRETE CEMENT PROD RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Alkali-activated gelling materials have excellent physical and mechanical properties and durability, but there are also problems such as high brittleness and easy cracking, which limit their application range.
[0003] Chinese patent (200510018696.1), Chinese patent (200910022883.5), and Chinese patent (201210442047.4) are respectively modified by using different types of fibers such as steel fibers, polypropylene fibers, polypropylene bundled monofilament fibers, and polyvinyl alcohol fibers. materials, and the fiber may be difficult to disperse evenly during the stirring process during use
[0004] Chinese patent (201210081093.6), Chinese patent (201210051713.1), Chinese patent (201310143484.0) and Chinese patent (201410056757.2) stimulate the cementitious material by adding polyvinyl chloride resin, rubber particles or rubber powder, emulsified asphalt, and waste rubber powder respectively. Modification, but waste rubber powder and rubber granules can only improve the bond strength, toughness and other properties of the material to a limited extent

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Embodiment 1: the preparation of the mortar containing cementitious material of the present invention

[0030] 1. Preparation of the modified alkali-activated gelling material of the present invention

[0031] Alkali activator: take 21.6g of sodium hydroxide and dissolve in 100g of water glass (30% solid content) with a modulus of 3.4, seal and age for 24h to obtain an alkali activator with a modulus of 1.0;

[0032] Modified alkali-activated gelling material: weigh 270g fly ash, 180g slag, 18g butadiene-styrene copolymer rubber powder and 4g BaCl 2 , stir and mix, add alkali activator when ready to use;

[0033] 2. Preparation and testing of mortar containing the cementitious material

[0034] Put 593.6g of the cementitious material prepared above, 1350g of sand and 142g of water in a mortar mixer for stirring, and mix it into a uniform slurry. After putting it into the mold, let it stand for 40 minutes, and steam it at 75°C for 2 hours. Tested after curing for 7 d...

Embodiment 2

[0036] Example 2: Preparation of mortar containing cementitious material of the present invention

[0037] 1. Preparation of the modified alkali-activated gelling material of the present invention

[0038] Alkali activator: take 18.3g of sodium hydroxide and dissolve in 100g of water glass (32% solid content) with a modulus of 3.0, seal and age for 24h to obtain an alkali activator with a modulus of 1.1;

[0039] Modified alkali stimulated gelling material: take by weighing 235g fly ash, 235g slag, 10g ethylene-vinyl acetate copolymer rubber powder and 2.5gBa(NO 3 ) 2 , stir and mix, add alkali activator when ready to use;

[0040] 2. Preparation and testing of mortar containing the cementitious material

[0041] Put 600.8g of the above-prepared cementitious material, 1200g of sand and 142g of water into a mortar mixer for stirring, and mix it into a uniform slurry. After putting it into the mold, let it stand for 50 minutes, steam it at 85°C for 2 hours, remove the mold,...

Embodiment 3

[0043] Example 3: Preparation of mortar containing cementitious material of the present invention

[0044] 1. Preparation of the modified alkali-activated gelling material of the present invention

[0045] Alkali activator: take 21.6g of sodium hydroxide and dissolve in 100g of water glass (30% solid content) with a modulus of 3.4, seal and age for 24h to obtain an alkali activator with a modulus of 1.0;

[0046]Modified alkali-activated gelling material: Weigh 270g fly ash, 180g slag, 9g vinyl acetate-vinyl tert-carbonate-acrylate copolymer rubber powder and 2.5g Al 2 (SO 4 ) 3 , stir and mix, add alkali activator when ready to use;

[0047] 2. Preparation and testing of mortar containing the cementitious material

[0048] Put 583.1g of the above-prepared cementitious material, 1000g of sand and 142g of water in a mortar mixer and mix them into a uniform slurry. After entering the mold, let it stand for 30 minutes, steam it at 70°C for 2 hours, remove the mold, and put ...

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Abstract

The invention aims to provide a modified alkali-activated cementing material and its preparation method. Raw materials of the cementing material contain, by weight, 100 parts of a mixture of fly ash and slag, 25-50 parts of an alkali-activator, 0.5-2 parts of a retarder and 2-15 parts of polymer powder, wherein solid content of the alkali-activator is 30-40%. The method for modifying an alkali-activated cementing material with the polymer powder is compared with a method for modifying an alkali-activated fly ash and slag material with a polymer emulsion. The method of the invention has characteristics as follows: production technology is simple; measurement and preparation are accurate; storage and transport are safe; construction and usage are convenient; and the product has fast condensation, high bonding strength, good acid-resistance and alkali-resistance, excellent durability and the like.

Description

technical field [0001] The invention relates to the field of composite materials, in particular to a modified alkali-activated gelling material and a preparation method thereof. Background technique [0002] Alkali-activated cementitious material is a kind of cementitious material with many advantages such as high strength, fast hardening and strong weather resistance, which is prepared by using fly ash, slag and other industrial solid wastes through alkali excitation. The composition of hydration products of alkali-activated gelling materials is relatively complex, generally composed of different contents of geopolymers, C-S-H gels, zeolites and different types of insoluble double salts. Alkali-activated gelling materials have excellent physical and mechanical properties and durability, but there are also problems such as high brittleness and easy cracking, which limit their application range. [0003] Chinese patent (200510018696.1), Chinese patent (200910022883.5), and C...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/00C04B24/26
CPCC04B28/008C04B40/0039C04B2103/22C04B2111/20C04B2111/23C04B2201/10C04B2201/50C04B18/08C04B18/141C04B22/062C04B22/08C04B24/2688C04B24/2623C04B24/2641C04B24/2676C04B40/0028C04B14/06C04B14/02C04B40/024C04B22/124C04B22/085C04B22/148
Inventor 邓建良董思勤陈晶晶
Owner SUZHOU CONCRETE CEMENT PROD RES INST
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