Preparation method of concrete having no strength negative effect and high internal curing efficiency

A concrete and negative technology, which is applied in the field of preparation of concrete with no negative impact on strength and high internal maintenance efficiency, can solve the problems of reduced concrete strength, low water absorption rate, and difficulty in ensuring internal maintenance efficiency, so as to achieve efficient utilization, eliminate negative impact, Avoid the effect of early free water release too quickly

Active Publication Date: 2018-11-06
HUBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the currently commonly used internal curing medium superabsorbent resin (SAP) is susceptible to the osmotic pressure of the cement pore solution inside the concrete, and the water inside the SAP will be released too quickly and prematurely, and it is difficult to control, resulting in low internal curing efficiency; Moreover, the macroscopic pores left after SAP release water often cause a significant decrease in the strength of concrete.
Another commonly used internal curing medium, pottery sand (LWA), mainly has low water absorption rate (5%-30%), and it is difficult to guarantee the internal curing efficiency; meanwhile, porous pottery sand also has a negative impact on the strength of concrete materials

Method used

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  • Preparation method of concrete having no strength negative effect and high internal curing efficiency
  • Preparation method of concrete having no strength negative effect and high internal curing efficiency
  • Preparation method of concrete having no strength negative effect and high internal curing efficiency

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] 1) Mix clay powder and pore regulator (carbon powder with an average particle size of 100 μm and polypropylene fiber with a diameter of 30 μm) with water to form a raw dough (both carbon powder and polypropylene fiber account for 15% of the mass of the raw dough, Water accounts for 20% of the mass of the raw dough), preheated and dried, calcined in the range of 800-1200 ° C for 1 h, and pulverized to obtain a porous rigid PM skeleton with high strength, high connectivity, and hierarchical pore structure (average particle size is 5μm-10mm);

[0033] 2) Soak the PM skeleton prepared in step 1) in a 2mol / L NaOH solution for 72h, wash it with fresh water, soak it in a silane coupling agent solution with a mass concentration of 1% for 24h, and dry it to obtain a surface modification. Sexually porous PM skeleton;

[0034] 3) Using the conventional sol-gel method, the monomer (acrylic acid), crosslinking agent (N,N'-methylenebisacrylamide, the dosage is 0.06% of the monomer m...

Embodiment 2

[0037] 1) Mix shale powder and pore regulator (EPS foam particles with an average particle size of 500 μm, waste paper plant fibers with a diameter of 50 μm) and water to form a raw material mass (carbon powder and polypropylene fiber account for the mass of the raw material mass respectively 10% and 40%, water accounts for 20% of the mass of the raw dough), preheated and dried, calcined in the range of 800-1200 ° C for 2 hours, and crushed to obtain porous rigidity with high strength, high connectivity and hierarchical pore structure PM skeleton (average particle size 4mm-20mm);

[0038] 2) Soak the PM skeleton prepared in step 1) in a 1mol / L NaOH solution for 72h, wash it with fresh water, soak it in a silane coupling agent solution with a mass concentration of 1.5% for 24h, and dry it to obtain a surface modification. Sexually porous PM skeleton;

[0039] 3) Using the conventional sol-gel method, the monomer (acrylic acid and acrylamide, the ratio of the two is 4:6), the c...

Embodiment 3

[0042] 1) Mix shale powder and pore regulator (carbon powder with an average particle size of 50nm and polypropylene fiber with a diameter of 15μm) with water to form a raw material mass (carbon powder and polypropylene fiber account for 20% of the mass of the raw material mass respectively and 10%, water accounts for 20% of the mass of the raw dough), preheated and dried, calcined in the range of 800-1200 ° C for 2 hours, and pulverized to obtain a porous rigid PM skeleton with high strength, high connectivity, and hierarchical pore structure ( The average particle size is 5μm-4mm);

[0043] 2) Soak the PM skeleton prepared in step 1) in a 4mol / L NaOH solution for 72h, wash it with fresh water, soak it in a silane coupling agent solution with a mass concentration of 0.5% for 24h, and dry it to obtain a surface modification. Sexually porous PM skeleton;

[0044] 3) Using the conventional sol-gel method, the monomer (acrylamide), crosslinking agent (N,N'-methylenebisacrylamide...

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Abstract

The invention discloses a preparation method of concrete having no strength negative effect and high internal curing efficiency. The technical scheme is characterized by firstly carrying out advancedwater absorption on a skeleton structure curing agent, then mixing the skeleton structure curing agent with river sand and break stones, and finally adding cement and residual water in sequence and uniformly stirring, thus obtaining the concrete, wherein the adding amount of the skeleton structure curing agent accounts for 0.1 to 0.5 percent of the mass of the concrete, and the preparation methodof the skeleton structure curing agent comprises the following steps: uniformly mixing raw material powder, a porous conditioning agent and water, thus obtaining a raw material lump; then drying, roasting and smashing, thus obtaining a porous rigid PM (Particulate Matter) skeleton; immersing the porous rigid PM skeleton in liquid SAP (Super Absorbent Polymer) gel for loading, and then drying, thusobtaining the skeleton structure curing agent of a rigid skeleton structure. The preparation method disclosed by the invention is simple and reliable in technology, low in production cost and high incuring efficiency, and has no strength negative effect.

Description

technical field [0001] The invention relates to the field of building materials, in particular to a method for preparing concrete with no negative impact on strength and high internal maintenance efficiency. Background technique [0002] Concrete is one of the most important civil engineering materials at present, and high performance is the main direction of the development of concrete materials. It is predicted that in the next 100 years or even longer, concrete will still be the most important engineering material, and high-performance concrete (HPC) will occupy the main position. [0003] Although the special raw material system and structural characteristics of high-performance concrete make many properties better than ordinary concrete, it also brings its inherent problems. Compared with ordinary concrete, high-performance concrete has the characteristics of high cementitious material consumption, low water-binder ratio, and high sand ratio. The water-binder ratio of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/00C04B24/26C04B24/38C04B24/14C04B18/02C08J3/075C08F251/00C08F220/56C08F220/06C08F222/38C08L33/26C08L51/02
CPCC04B18/027C04B24/14C04B24/2652C04B24/2688C04B24/38C04B28/00C04B40/0039C04B2201/50C04B2201/52C08F220/56C08F251/00C08J3/075C08J2333/26C08J2351/02C04B14/02C04B14/068C04B2103/0051C04B18/023C04B14/10C04B14/022C04B16/0633C04B14/108C04B16/08C04B18/241C08F220/06C08F222/385
Inventor 杨进贺行洋苏英王发洲郑正旗黄健翔
Owner HUBEI UNIV OF TECH
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