Preparation method of high-adaptability concrete

An adaptable and concrete technology, applied in the field of high-adaptability concrete preparation, can solve the problems of no longer having water absorption and water retention, low activity of fly ash, high price of silica fume, etc., and achieve constant dispersibility and slump. , delaying the hydration reaction, inhibiting the effect of self-shrinkage

Active Publication Date: 2017-04-26
HUBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although natural zeolite has a porous structure, the ultra-fine powder of natural zeolite is a fine powder with an average diameter of less than 10um. volume is very low

Method used

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  • Preparation method of high-adaptability concrete

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038]1) Mix 224kg of cement with 100kg of water, wet grind for 60s, add 298kg of composite superfine admixture and 700k of fine aggregate, and mix to obtain cement mortar;

[0039] The composite superfine admixture is made of water-quenched ore powder, wet-discharged fly ash and limestone powder mixed uniformly through wet grinding at a mass ratio of 1:3.5:0.5;

[0040] 2) Enter the cement mortar obtained in step 1) through the slurry inlet of the screw press dehydrator, and use the rotation of the screw shaft to advance the slurry axially in the filter drum, and gradually reduce the volume of the spiral groove, so that the slurry is subjected to radial and Axial mechanical extrusion gradually dehydrates and concentrates until the water-binder ratio is 0.25;

[0041] 3) Add 1100kg of coarse aggregate to the material obtained in step 2), stir for 90s, then add 20kg of pumping agent, 10kg of self-curing micro-expansive agent and 6kg of high-compatible plastic-retaining agent, a...

Embodiment 2

[0045] 1) Mix 300kg of cement with 135kg of water, and after wet milling for 60s, add 143kg of composite superfine admixture and 600k of fine aggregate, and mix to obtain cement mortar;

[0046] The composite superfine admixture is made of water-quenched ore powder, wet-discharged fly ash and limestone powder mixed uniformly through wet grinding at a mass ratio of 1:3.5:0.5;

[0047] 2) Enter the cement mortar obtained in step 1) through the slurry inlet of the screw press dehydrator, and use the rotation of the screw shaft to advance the slurry axially in the filter drum, and gradually reduce the volume of the spiral groove, so that the slurry is subjected to radial and Axial mechanical extrusion gradually dehydrates and concentrates until the water-binder ratio is 0.22;

[0048] 3) Add 1000kg of coarse aggregate to the material obtained in step 2), stir for 30s, then add 10kg of pumping agent, 5kg of self-curing micro-expansive agent and 3kg of high-compatible plastic-retain...

Embodiment 3

[0052] 1) Mix 250kg cement with 113kg water, add 200kg composite superfine admixture and 650k fine aggregate after wet grinding for 40 seconds, and mix to obtain cement mortar;

[0053] The composite superfine admixture is made of water-quenched ore powder, wet-discharged fly ash and limestone powder mixed uniformly through wet grinding at a mass ratio of 1:3.3:0.35;

[0054] 2) Enter the cement mortar obtained in step 1) through the slurry inlet of the screw press dehydrator, and use the rotation of the screw shaft to advance the slurry axially in the filter drum, and gradually reduce the volume of the spiral groove, so that the slurry is subjected to radial and Axial mechanical extrusion gradually dehydrates and concentrates until the water-binder ratio is 0.23;

[0055] 3) Add 1050kg of coarse aggregate to the material obtained in step 2), stir for 50 seconds, then add 15kg of pumping agent, 8kg of self-curing micro-expansive agent and 4kg of high-compatible plastic-retaini...

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Abstract

The invention relates to a preparation method of high-adaptability concrete, wherein the preparation method comprises the steps: mixing 224-300 kg of cement with 100-135 kg of water, wet-grinding, adding 143-298 kg of a composite superfine admixture and 600-700 kg of a fine aggregate, and mixing to obtain cement mortar; allowing the cement mortar to enter from a slurry inlet of a screw press dehydrator, gradually dehydrating and concentrating the slurry due to the radial and axial mechanical squeezing effects, putting 1000-1100 kg of a coarse aggregate, stirring, then putting 10-20 kg of a pumping agent, 5-10 kg of a self-curing micro expansion agent and 3-6 kg of a high compatible plasticity-maintaining agent, and stirring into the high-adaptability concrete. The obtained concrete has the advantages of high plasticity maintaining, low shrinkage, low hydration heat, low cost, self compacting and self-curing performance; all the performance indicators are in line with needs of the ''technical specification for application of high strength concrete'' JGJ / T 281-2012, and the concrete is mainly used in super high-rise buildings, large marine engineering, long-span bridges, tunnels and railway, and nuclear power engineering.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a preparation method of highly adaptable concrete. Background technique [0002] At present, with the development of the national economy, the emergence of a large number of super high-rise buildings, the increasing number of large-scale marine projects, and the gradual increase in the call for green development in the construction industry have put forward new requirements for concrete, which is an important part of the construction industry. [0003] CN103524093B discloses a kind of ultra-high-strength concrete, which is ordinary portland cement 360-480kg / m 3 , fly ash 50-100kg / m 3 ,Phosphorus slag powder 40-100kg / m 3 , silica fume 30-60kg / m 3 , coarse aggregate 1000-1100kg / m 3 , fine aggregate 600-700kg / m 3 , water 130-140kg / m 3 , Naphthalene-based and polycarboxylic acid composite water reducer 9-12kg / m 3 Prepared. [0004] CN101323515B disclose...

Claims

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Application Information

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IPC IPC(8): C04B28/04C04B40/00C04B7/52C04B20/02C04B18/14C04B14/28C04B18/08
CPCC04B7/522C04B20/026C04B28/04C04B40/0028C04B2111/00146C04B18/141C04B14/28C04B18/08C04B14/06C04B20/0016C04B2103/40C04B2103/302C04B22/148C04B14/08C04B24/32C04B24/085Y02W30/91
Inventor 贺行洋代飞孙艺恒叶青兰蒙郑正旗王庭苇刘雨轩邱慧琼王迎斌苏骏
Owner HUBEI UNIV OF TECH
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