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Concrete preparation method capable of promoting quick development of strength through pre-aging

A concrete and rapid technology, applied in the direction of clay preparation equipment, chemical instruments and methods, cement mixing equipment, etc., can solve the problems that steam curing does not conform to the direction of social development, increase the cost of concrete steam, and avoid quality defects and performance degradation , shorten the demoulding time and avoid the effect of steam curing process

Active Publication Date: 2019-04-05
CHINA UNIV OF MINING & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Even if enterprises increase investment to establish a relatively complete curing kiln process and a complete steam curing system, due to the policy requirements of low-carbon economy and environmental protection, the country has restricted the use of coal, and the conversion of coal to gas has greatly increased the steam cost of concrete. Conservation is no longer in line with the direction of social development

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  • Concrete preparation method capable of promoting quick development of strength through pre-aging
  • Concrete preparation method capable of promoting quick development of strength through pre-aging

Examples

Experimental program
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Effect test

Embodiment 1

[0031] A method for preparing concrete that promotes the rapid development of strength by pre-aging, and the preparation process includes construction mix ratio design, preparation and aging of cement paste, and concrete preparation; the specific method process is as follows:

[0032] Part 1: Construction mix design

[0033] The concrete construction mix ratio is designed according to the strength grade and workability requirements of the prefabricated building components; the specific concrete construction mix ratio includes: 185 parts of water, 325 parts of cement (P.O.42.5 cement), 662 parts of sand (sand is medium sand, fineness The modulus is 2.3~3.0), 1228 parts of stones (the stone is crushed stone with a particle size of 5~40mm.) and 5 parts of polycarboxylate high-performance water reducer, parts by weight;

[0034] (1) Determination of the initial setting time of the cement paste: prepare the cement paste according to the water-cement ratio in the above-mentioned con...

Embodiment 2

[0045] Concrete according to the method in Example 1, the difference is that the concrete construction mix ratio is: parts by weight are: 185 parts of water, 370 parts of cement (P.O.42.5 cement), 609 parts of sand (sand is medium sand, fine modulus of 2.3 to 3.0), 1236 parts of stones (the stone is crushed stone with a particle size of 5 to 40mm.) and 6 parts of polycarboxylate high-performance water reducer.

[0046] Determination of initial setting time of cement paste, denoted as T 1 =9h;

[0047] The daily production time of concrete is denoted as T 2 = 12h, then the number of cement paste preparations per day n = T 2 / T 1 , where n is an integer, n=2.

Embodiment 3

[0049] Concrete according to the method in Example 1, the difference is that the concrete construction mix ratio is: parts by weight are: 185 parts of water, 420 parts of cement (cement is P.O.42.5 cement), 572 parts of sand (sand is medium sand) , fineness modulus is 2.3 ~ 3.0), 1273 parts of stones (the stone is crushed stone, particle size is 5 ~ 40mm.) and 7 parts of polycarboxylate high-performance water reducer.

[0050] Determination of initial setting time of cement paste, denoted as T 1 =7h;

[0051] The daily production time of concrete is denoted as T 2 = 12h, then the number of cement paste preparations per day n = T 2 / T 1 , where n is an integer, n=2.

[0052] For the proportioning of Example 1, Example 2 and Example 3, the strength rapid development concrete prepared according to the method of the example was tested for compressive strength, and the test results are shown in the table.

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Abstract

The invention relates to a concrete preparation method capable of promoting quick development of strength through pre-aging. The method includes: pre-preparing cement paste according to a water cementratio of construction mixing proportion, aging to be close to initial setting, and adding a water reducer to enable the cement paste to reach workability needed for construction to prepare concrete.The concrete is prepared when the cement paste is close to initial setting, and initial setting time of the cement paste is omitted, so that early-stage maintenance time of the concrete is prolonged indirectly, early-stage strength is improved, strength of a prefabricated component can be made to reach 15-25Mpa within 8-16h, requirements on quick demolding, hoisting, stacking and transporting of the prefabricated component are met, mold transfer of enterprises is accelerated, and production efficiency is improved. a steam curing process in conventional prefabricated component making processesis omitted, energy consumption is reduced, and cost is lowered. Concrete quality defect and performance degradation caused by the fact that maintenance conditions are controlled improperly in the process of steam curing can be avoided, and strength and durability of the concrete are improved.

Description

technical field [0001] The invention belongs to the technical field of concrete, and in particular relates to a method for preparing concrete that is pre-aged to promote the rapid development of strength Background technique [0002] Prefabricated buildings are a major change in the way of construction. After World War II, developed countries widely adopted prefabricated construction methods in order to meet the needs of large-scale and rapid construction of housing and the needs of comprehensively improving the quality and quality of buildings. my country's current building construction is still dominated by on-site pouring operations, and the proportion of prefabricated buildings in new buildings is less than 5%, which is far behind the international advanced level. The development of prefabricated buildings is an important manifestation of firmly establishing and implementing the five development concepts of innovation, coordination, greenness, openness, and sharing, and...

Claims

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Application Information

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IPC IPC(8): C04B28/02B28C5/00
CPCB28C5/003C04B28/02C04B2201/50C04B14/06C04B14/02C04B2103/302
Inventor 姬永生吴守荣郭煜诚时方鸣徐之山张领雷张莉刘本琳石博文徐圣楠严久鑫陈鑫冰陈豪周样梅
Owner CHINA UNIV OF MINING & TECH
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