High early-strength high-performance concrete mixed with nano silicon dioxide powder and preparation method thereof

A technology of nano-silica and high-performance concrete, which is applied in the field of civil engineering concrete, can solve the problem of less nano-SiO2 being added, and achieve the effect of significant technical and economic significance, improvement of compressive strength, and improvement of concrete strength.

Inactive Publication Date: 2014-08-13
HOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, for the incorporation of nano-SiO in concrete 2 There are relatively few studies, which are limited to interface modification, macroscopic physical and mechanical properties, etc.

Method used

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  • High early-strength high-performance concrete mixed with nano silicon dioxide powder and preparation method thereof
  • High early-strength high-performance concrete mixed with nano silicon dioxide powder and preparation method thereof
  • High early-strength high-performance concrete mixed with nano silicon dioxide powder and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A seaport project uses self-compacting high-strength freeze-thaw-resistant concrete. The raw materials and properties used are as follows:

[0035] Cement: PI42.5 Portland cement, purchased from Nanjing Yuhua Cement Factory.

[0036] Fine aggregate: river sand, fineness modulus 2.3, medium sand; apparent density 2.57g / cm 3 , rinse and dry before use.

[0037] Coarse aggregate: high-density limestone with a nominal particle size of 5-35mm and an apparent density of 2.85g / cm 3 .

[0038] Water: tap water.

[0039] Water reducer: polycarboxylate water reducer, water reducing rate 42%. Purchased from Nanjing Pioneer Technology Industrial Co., Ltd.

[0040] nano-SiO 2 Powder: Nano SiO 2 The content is greater than 99.5%, and the particle size is 30±5nm. Purchased from Hangzhou Wanjing New Material Co., Ltd.

[0041] According to the "Ordinary Concrete Mix Design Regulations (JGJ55-2011)", the concrete mix design is as follows (sand ratio 37%, water-cement ratio 0.4)...

Embodiment 2

[0047] Raw materials:

[0048] Cement: Conch brand PC42.5 composite portland cement

[0049] Fine aggregate: river sand, fineness modulus 2.3, medium sand; apparent density 2.65g / cm 3 , rinse and dry before use.

[0050] Coarse aggregate: basalt crushed stone in Nanjing area, with a nominal particle size of 5-35mm.

[0051] Water: Nanjing tap water.

[0052] Water-reducing agent: Richlam240 naphthalene-based concrete high-efficiency water-reducing agent produced by Nanjing Pioneer Technology Industrial Co., Ltd., with a water-reducing rate of 25%.

[0053] nano-SiO 2 Powder: Nano-SiO produced by Zhejiang Hangzhou Wanjing New Material Co., Ltd. 2 Powder, nano substance content greater than 99.5%, average particle size 30nm, specific surface area 200mm 2 / g, the weight loss on ignition rate is 3.5%.

[0054] This example sets to add nano-SiO 2 Early-strength concrete with powder and without adding nano-SiO 2 Ordinary concrete with powder, in accordance with "Common Conc...

Embodiment 3

[0060] Raw materials:

[0061] Cement: Conch brand PC32.5 composite Portland cement

[0062] Fine aggregate: river sand, fineness modulus 2.3, medium sand; apparent density 2.65g / cm 3 , rinse and dry before use.

[0063] Coarse aggregate: basalt crushed stone in Nanjing area, with a nominal particle size of 5-35mm.

[0064] Water: Nanjing tap water.

[0065] Water-reducing agent: Richlam240 naphthalene-based concrete high-efficiency water-reducing agent produced by Nanjing Pioneer Technology Industrial Co., Ltd., with a water-reducing rate of 25%

[0066] nano-SiO 2 Powder: Nano-SiO produced by Zhejiang Hangzhou Wanjing New Material Co., Ltd. 2 Powder, nano substance content greater than 99.5%, average particle size 30nm, specific surface area 200m 2 / g, the weight loss on ignition rate is 3.5%.

[0067] This example sets to add nano-SiO 2 Early-strength concrete with powder and without adding nano-SiO 2 Ordinary concrete with powder, in accordance with "Common Concre...

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Abstract

The invention discloses a high early-strength high-performance concrete mixed with nano silicon dioxide powders and a preparation method thereof. The concrete comprises following components, 519-550 kg / m<3> of cement, 1010-1040 kg / m<3> of a crude aggregate, 600-620 kg / m<3> of a fine aggregate, 225-235 kg / m<3> of water, 7.77-9.1 kg / m<3> of a high-performance water reducer and 8.1-16.2 kg / m<3> of nano silicon dioxide. A mixing ratio of the concrete is 37-38% in sand percentage and 0.40-0.43 in water-cement ratio. The fine aggregate is river sand or medium sand and the particle size of the crude aggregate is 5-35 mm. Water reducing rate of the high-performance water reducer is not less than 25%. The average particle size of the nano silicon dioxide is 30+ / -5 nm. The preparation method can improve early strength of the concrete and the concrete can be used for winter construction of a super-high-rise building and a concrete project which has an early-period requirement of a normal temperature condition and a low temperature condition. The concrete is high in practical value.

Description

technical field [0001] The invention belongs to the technical field of civil engineering concrete, and relates to the preparation technology of early-strength high-performance concrete, in particular to improving the early performance of concrete by using nano-silica as an additive. Background technique [0002] Since the emergence of Portland cement in the 1920s, the concrete prepared with it has the strength and durability required by engineering, and the raw materials are easy to obtain, the cost is low, especially the energy consumption is low, so it is widely used. , has become an important structural material for modern engineering structures such as civil engineering, water conservancy engineering, and transportation. [0003] At the beginning of the 20th century, with the proposal of water-cement ratio and other theories, the theoretical foundation of concrete strength was initially established. Later, light aggregate concrete, air-entrained concrete and other concr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04C04B22/06
Inventor 黄丹王委侯学彪王梦蔚
Owner HOHAI UNIV
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