Method for improving deformability of high-ductility concrete

A technology of high ductility concrete and capacity, which is applied in the field of building materials and high ductility concrete. It can solve the problems of increasing fiber cost, complex technology, and unfavorable tensile ductility of high ductility concrete materials, so as to avoid wear and improve interface performance.

Active Publication Date: 2020-07-17
CHINA RAILWAY NO 2 ENG GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The large chemical bonding energy makes the PVA fiber be pulled out during the pull-out process instead of pulling out, which is not conducive to the tensile ductility of high-ductility concrete materials, which greatly restricts the application of high-ductility concrete materials in the field of civil engineering in my country. app promotion for
[0005] In the past two decades, in order to reduce the chemical bonding energy between PVA fibers and cement hydration products, Japan's Kuraray Trading Co., Ltd. used coating technology to pre-treat the surface of PVA fibers and monopolized this technology globally. technology, and this technology is more complicated, which increases the cost of fiber
For other PVA fiber manufacturers, it is still impossible to realize the surface treatment technology of PVA fiber

Method used

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  • Method for improving deformability of high-ductility concrete
  • Method for improving deformability of high-ductility concrete
  • Method for improving deformability of high-ductility concrete

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0106] According to the traditional high ductility concrete material, the proportion of each raw material (by weight) is shown in Table 7.

[0107] Table 7

[0108] cement fly ash Quartz sand water Superplasticizer Modified PVA fiber waste oil 100 220 100 80 0.30 2.0% of the total volume of high ductility concrete 3 copies

[0109] Among them, the cement is ordinary Portland cement with a label of 52.5; the fly ash is a first-class fly ash, and the specific surface area is ≥800m 2 / kg, the density is 2.8g / cm 3 ;Quartz sand is made of standard sand; the water reducer is polycarboxylate high-efficiency water reducer; the nominal length of PVA fiber is 8-15mm, the equivalent diameter is 30-45μm, and the tensile strength is ≥1200N / mm 2 , The elongation at break is 3-5%.

[0110] Modified PVA fiber is modified by the following methods:

[0111] (1) Ultrasonic cleaning of PVA fibers with alcohol, then soaking in NaOH solution for 3 hours, dr...

Embodiment 2

[0121] The batching is carried out according to the traditional high ductility concrete material, and the ratio of each raw material (by weight) is shown in Table 8.

[0122] Table 8

[0123] cement fly ash Quartz sand water Superplasticizer Modified PVA fiber waste oil 100 100 200 55 0.10 1.5% of the total volume of high ductility concrete 3 copies

[0124] Among them, the cement is ordinary Portland cement with a label of 52.5; the fly ash is a first-class fly ash, and the specific surface area is ≥800m 2 / kg, the density is 2.8g / cm 3 ;Quartz sand is made of standard sand; the water reducer is polycarboxylate high-efficiency water reducer; the nominal length of PVA fiber is 8-15mm, the equivalent diameter is 30-45μm, and the tensile strength is ≥1200N / mm 2 , The elongation at break is 3-5%.

[0125] Modified PVA fiber is modified by the following methods:

[0126] (1) Ultrasonic cleaning of PVA fibers with alcohol, then soaking in Na...

Embodiment 3

[0136] According to the traditional high ductility concrete materials, the proportion of each raw material (by weight) is shown in Table 9.

[0137] Table 9

[0138] cement fly ash Quartz sand water Superplasticizer Modified PVA fiber waste oil 100 400 100 125 0.30 2.5% of the total volume of high ductility concrete 3 copies

[0139] Among them, the cement is ordinary Portland cement with a label of 52.5; the fly ash is a first-class fly ash, and the specific surface area is ≥800m 2 / kg, the density is 2.8g / cm 3 ;Quartz sand is made of standard sand; the water reducer is polycarboxylate high-efficiency water reducer; the nominal length of PVA fiber is 8-15mm, the equivalent diameter is 30-45μm, and the tensile strength is ≥1200N / mm 2 , The elongation at break is 3-5%.

[0140] Modified PVA fiber is modified by the following methods:

[0141] (1) Ultrasonic cleaning of PVA fibers with alcohol, then soaking in NaOH solution for 3 hours, ...

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Abstract

The invention discloses a method for improving the deformability of high-ductility concrete, wherein the method comprises the steps: carrying out surface treatment on PVA fibers to form a rough surface; carrying out silane coupling agent surface modification on nano silicon dioxide, and grafting polycaprolactone on the surface of the modified nano silicon dioxide; then adding into deionized watermixed with a surfactant, and carrying out ultrasonic dispersion to obtain a nano silicon dioxide dispersion solution; taking epoxy chloropropane as a cross-linking agent, and carrying out cross-linking modification on welan gum to obtain a cross-linked welan gum solution; taking a nano silicon dioxide dispersion solution as a modifier and a cross-linked welan gum solution as a cross-linking agent,and carrying out surface modification on PVA fibers to obtain surface-hydrophobic modified PVA fibers; and finally, taking cement, fly ash, quartz sand, water, a water reducing agent, waste engine oil and the modified PVA fibers as raw materials, and molding to obtain the high-ductility concrete.

Description

technical field [0001] The invention belongs to the field of building materials, in particular to the technical field of high ductility concrete, in particular to a method for improving the deformation capacity of high ductility concrete. Background technique [0002] As the most common building material, cement concrete exhibits a brittle behavior under tensile or bending loads. In order to improve the brittleness of concrete materials, it is a relatively common way to add a certain amount of chopped fibers (ie, fiber concrete) to concrete materials. [0003] High ductility concrete material (engineered cementitious composites, referred to as ECC) is a special fiber-reinforced cement-based material, which is based on the design theory of micro-mechanics and fracture mechanics through the systematic design and optimization of cement matrix, fibers, and fiber / matrix interface properties. Formed, usually its fiber content is about 2%. Different from the brittle failure mode ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04C04B20/02
CPCC04B20/023C04B28/04C04B2201/50C04B18/08C04B14/06C04B16/0641C04B2103/302
Inventor 舒永鸣罗桑张海涛胡靖罗雷习均张志刚卢怡黄强徐圣钦
Owner CHINA RAILWAY NO 2 ENG GRP CO LTD
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