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High-strength and high-durability lightweight aggregate concrete and preparation method thereof

A lightweight aggregate concrete and durability technology, applied in the field of lightweight aggregate concrete, can solve problems such as the inability to meet the service life, and achieve the effects of improving the resistance to chloride ion penetration of the structure, improving the workability of concrete, and increasing the span of large bridges

Active Publication Date: 2015-03-04
建发合诚工程咨询股份有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At the same time, its durability is only evaluated by the general water permeability test, which has been unable to meet the requirements of the 100-year design service life.

Method used

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  • High-strength and high-durability lightweight aggregate concrete and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0027] A kind of C40 high-strength and high-durability lightweight aggregate concrete and its preparation method:

[0028] The main raw materials in each m3 volume of concrete are as follows: Ordinary Portland cement P.O52.5R 250kg / m3 produced by Jidong Cement; micro-silica fume 150kg / m3; / m3; 240kg / m3 of mixing water in line with the industry standard JGJ 63-2006 "Water for Concrete"; 4kg / m3 of polycarboxylate high-efficiency water reducer produced by BASF, Germany.

[0029] Among them, the density of ordinary Portland cement P.O 52.5R cement is 3.09g / cm3, the initial setting time is 1.5h, the final setting time is 5.0h, the 7d compressive strength is 38.1MPa, and the 28d compressive strength is 57.4MPa. The silicon dioxide content of micro-silica powder is 90%, the specific surface area is 23m2 / g, and the pH value is 7.1; the lightweight ceramsite adopts crushed stone ceramsite produced in Zigui, Hubei Province, with a particle size of 5-15mm and an apparent The density is ...

Embodiment 2

[0032] A kind of C45 high-strength and high-durability lightweight aggregate concrete and its preparation method:

[0033] The main raw materials in each m3 volume of concrete are as follows: Ordinary Portland cement P.O52.5R 316kg / m3 produced by Jidong Cement Factory; micro-silica fume 160kg / m3; / m3; 200kg / m3 of mixing water in line with the industry standard JGJ 63-2006 "Water for Concrete"; 5.71kg / m3 of polycarboxylate superplasticizer produced by Tianjin Construction Engineering.

[0034] Among them, the density of ordinary Portland cement P.O 52.5R cement is 3.09g / cm3, the initial setting time is 1.5h, the final setting time is 5.0h, the 7d compressive strength is 38.1MPa, and the 28d compressive strength is 57.4MPa. The silicon dioxide content of micro-silica powder is 90%, the specific surface area is 23m2 / g, and the pH value is 7.1; the lightweight ceramsite adopts crushed stone ceramsite produced in Zigui, Hubei Province, with a particle size of 5-15mm and an apparent...

Embodiment 3

[0037] A kind of C50 high-strength and high-durability lightweight aggregate concrete and its preparation method

[0038] The main raw materials in each m3 volume of concrete are as follows: Ordinary Portland cement P.O 52.5340kg / m3 produced by Jidong Cement; micro-silica fume 190kg / m3; The mixing water specified in the industry standard JGJ 63-2006 "Water for Concrete" is 186kg / m3; the polycarboxylate superplasticizer produced by BASF in Germany is 6.36kg / m3.

[0039] Among them, the density of ordinary Portland cement P.O 52.5 cement is 3.05g / cm3, the initial setting time is 1.2h, the final setting time is 5.4h, the 7d compressive strength is 35.7MPa, and the 28d compressive strength is 56.2MPa. The inspection is qualified; the silicon dioxide content of micro silica fume is 92%, the specific surface area is 23m2 / g, and the pH value is 7.1; the lightweight ceramsite is crushed stone ceramsite produced in Zigui, Hubei, with a particle size of 5-15mm and an apparent density 1...

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Abstract

The invention discloses high-strength and high-durability lightweight aggregate concrete and a preparation method thereof, and relates to lightweight aggregate concrete. Each cubic meter of concrete comprises the following raw materials by weight: 200-380kg of cement, 150-250kg of silica fume, 650-750kg of 5-15mm ceramsite, 180-240kg of water and 4-10kg of a polycarboxylate superplasticizer. The preparation method comprises the following steps: firstly, soaking shale-sintered lightweight ceramisite in saturated limewater, fishing out ceramisite floating on the surface, and reserving the settled ceramisite for later use; respectively weighing the settled ceramisite, the silica fume, the cement, the polycarboxylate superplasticizer and water according to the ratio for later use; adding the settled ceramisite to a stirrer to stir in advance; adding the cement and the silica fume to the stirrer to stir in advance, and then stopping the stirrer; starting the stirrer; firstly adding water which accounts for 1 / 3 of the total amount to the running stirrer, stirring, and simultaneously adding the rest water and the polycarboxylate superplasticizer to the specified amount; and further stirring until mixing evenly, so as to obtain the high-strength and high-durability lightweight aggregate concrete.

Description

technical field [0001] The invention relates to a lightweight aggregate concrete, in particular to a high-strength and high-durability lightweight aggregate concrete and a preparation method thereof. Background technique [0002] Concrete has become the most used material in the world today, and lightweight aggregate concrete, also known as lightweight aggregate concrete, is made of mineral admixtures of light coarse aggregate, light fine aggregate, cement and water, and chemical admixtures if necessary. and the dry apparent density at the age of 28 days under standard curing conditions is less than 1950kg / m 3 of concrete. Lightweight aggregate concrete has a history of nearly a hundred years of application. It first appeared in the United States. As early as 1913, the United States developed shale ceramsite lightweight aggregate to replace ordinary sand and gravel aggregate. Lightweight aggregate concrete was invented. To reduce the weight of concrete and improve other pr...

Claims

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Application Information

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IPC IPC(8): C04B28/00C04B28/04
Inventor 程棋锋刘德全林东明康明旭陈永坤
Owner 建发合诚工程咨询股份有限公司
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