Preparation method of concrete mixed with addition and aggregate

An admixture and concrete technology, which is applied in clay preparation devices, mixing operation control, chemical instruments and methods, etc., can solve problems such as the decline of concrete strength and durability, improve compressive strength, improve interfacial bonding strength, Eliminate the effect of interface transition areas

Inactive Publication Date: 2007-07-11
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is still an interfacial transition zone between the aggregate and the cement stone in the concrete produced by the above concrete mixing process and the concrete mixed with admixtures, which is still a weak link in the concrete, resulting in a decrease in the strength and durability of the concrete

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Concrete weight ratio: (90% cement + 10% silica fume): water: fine aggregate: coarse aggregate: water reducer = 1: 0.50: 2.40: 3.60: 0.0075

[0019] Cement: PO42.5 Ordinary Portland Cement 5.76kg

[0020] Silicon powder: Imported densified silicon powder 0.64kg

[0021] Coarse aggregate: natural gravel, gradation 5-25mm, water absorption 3.64%, 15.3kg

[0022] Fine aggregate: natural medium sand, water absorption 1.48% 23.0kg

[0023] Water reducer: SN-II 0.048kg

[0024] The amount of water added for the first time: 1.11kg

[0025] The amount of water added for the second time: 3.2kg

[0026] Process conditions:

[0027] Weigh the coarse and fine aggregates and put them into the mixer—add 1.11kg of tap water and stir for 30 seconds—add 0.64kg of silicon powder and stir for 60 seconds—add 5.76kg of cement and 0.048kg of water reducing agent and stir for 60 seconds—add 3.2kg of tap water and stir for 90 seconds , to obtain the admixture-wrapped aggregate concrete. ...

Embodiment 2

[0031] Concrete weight ratio: (80% cement + 10% slag + 10% fly ash): water: sand: stone = 1: 0.65: 2.87: 4.12

[0032] Cement: PO32.5 Ordinary Portland Cement 4.4kg

[0033] Slag: S95 grade slag fine powder 0.55kg

[0034] Fly ash: Class II fly ash 0.55kg

[0035] Coarse aggregate: natural gravel, gradation 5-40mm, water absorption 3.64%, 16.2kg

[0036] Fine aggregate: natural medium sand, water absorption rate 1.48%, 23.2kg

[0037] The amount of water added for the first time: 1.07kg

[0038] The amount of water added for the second time: 3.60kg

[0039] Process conditions:

[0040] Weigh the coarse and fine aggregates and put them into the mixer—add 1.07kg of tap water and stir for 30 seconds—add 0.49kg of slag and 0.49kg of fly ash and stir for 60 seconds—add 3.92kg of cement and stir for 60 seconds—add 3.20kg of tap water and stir for 60 seconds, That is, the aggregate-wrapped admixture concrete is obtained.

[0041] Effect: The 28-day compressive strength of conc...

Embodiment 3

[0043] Concrete weight ratio: (80% cement + 20% fly ash): water: sand: stone: water reducing agent = 1: 0.40: 1.58: 2.45: 0.01

[0044] Cement: PO42.5 Ordinary Portland Cement 7.2kg

[0045] Fly ash: Class I fly ash 1.8kg

[0046] Coarse aggregate: natural gravel, gradation 5-20mm, water absorption 3.64%, 14.2kg

[0047]Fine aggregate: natural fine sand, water absorption 1.72% 22.1kg

[0048] Water reducer: SN-II 0.09kg

[0049] The amount of water added for the first time: 1.05kg

[0050] The amount of water added for the second time: 3.60kg

[0051] Process conditions:

[0052] Weigh coarse and fine aggregates and put them into the mixer—add 1.05kg of tap water and stir for 60 seconds—add 1.8kg of fly ash and stir for 60 seconds—add 7.2kg of cement and 0.09kg of water reducing agent and stir for 60 seconds—add 3.60kg of tap water and stir for 90 seconds seconds, the admixture-wrapped aggregate concrete is obtained.

[0053] Effect: the 28-day compressive strength of t...

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Abstract

The invention relates to a method for producing concrete dipped with skeleton material, wherein said method comprises that: packing dipping material layer on the face of skeleton, to be mixed with cement and water, to obtain the mixture. And said mixture comprises: mineral slag, silicon powder, coal powder ash, and sinter China clay; the weigh ratio between mixture and cement is 1:1-9. The invention can reduce or eliminate the interface transition area, to improve the adhesive strength between skeleton and cement stone. And compared with common technique, the invention can improve 20-40% anti-compress strength.

Description

(1) Technical field [0001] The invention relates to a method for preparing aggregate-wrapped concrete, which belongs to the technical field of civil engineering concrete materials. (2) Background technology [0002] The common concrete mixing process is to mix cement, water, fine aggregate, coarse aggregate and admixture together to form a concrete mixture. The strength and durability of the concrete mixed by this process are poor. The reason is that the directional enrichment layer of calcium hydroxide is formed at the interface between the aggregate and the cement stone. There are many ways to improve the strength of concrete by improving the mixing process. In Japan, the bonding strength between the aggregate and the cement stone interface is improved by using the cement-wrapped sand process, thereby increasing the strength of the concrete. The cement is added to the mixer and stirred together, and finally the coarse aggregate, the rest of the water and the water reduce...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B28C5/00B28C7/04B28C7/12
CPCC04B28/02C04B20/1074
Inventor 孔德玉郑建军盛毅生王章夫
Owner ZHEJIANG UNIV OF TECH
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