Large-volume concrete beneficial for controlling temperature and shrinkage crack and construction process thereof

A technology of mass concrete and shrinkage cracks, applied in the processing of building materials, construction, building construction, etc., can solve problems such as waste of resources and energy, and achieve the effect of reducing costs, easy temperature control, and significant economic benefits.

Active Publication Date: 2013-05-01
NO 1 CONSTR ENG CO LTD OF CHINA CONSTR THIRD ENG BUREAU CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Premature deterioration, cracking and destruction of co...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A kind of mass concrete that is conducive to controlling temperature and shrinkage cracks. The weight ratio of each component cement: coarse aggregate: fine aggregate: water is 1:3.23:2.1:0.5; wherein the cement is pozzolanic cement, and the specific indicators are Magnesium oxide weight percentage is less than or equal to 5%, sulfur trioxide weight percentage is less than or equal to 3.5%, alkali weight percentage is less than or equal to 0.6%, ignition loss is less than or equal to 5%, and a square hole with a mesh size of 80um is used The sieve residue of the sieve is less than or equal to 10%, the initial setting time of cement is not earlier than 45min, and the final setting time is not later than 10h; the coarse aggregate is continuously graded stones with a particle size of 20mm, and the weight percentage of mud content is less than 1%. The weight percentage of mud lumps is less than 0.5%, the weight percentage of needle-shaped and / or flake particles is less tha...

Embodiment 2

[0029] A kind of mass concrete that is conducive to controlling temperature and shrinkage cracks. The weight ratio of each component cement: coarse aggregate: fine aggregate: water is 1:3.1:2.3:0.45; wherein the cement is slag cement, and the specific index is Magnesium oxide weight percentage is less than or equal to 5%, sulfur trioxide weight percentage is less than or equal to 3.5%, alkali weight percentage is less than or equal to 0.6%, ignition loss is less than or equal to 5%, and a square hole with a mesh size of 80um is used The sieve residue of the sieve is less than or equal to 10%, the cement initial setting time is not earlier than 45min, the final setting time is not later than 10h, and other component indexes are the same as in Example 1.

[0030] The components of concrete in embodiment 1 and embodiment 2 can also be mixed with fly ash and admixture, and the admixture quality of described fly ash is 20% of cement quality in the component, and the admixture qualit...

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Abstract

The invention relates to a large-volume concrete beneficial for controlling temperature and shrinkage crack and the construction process thereof. The large-volume concrete is as follows: the weight ratio of cement, coarse aggregate, fine aggregate and water is 1.3-3.5 to 2-2.3 to 0.45-0.55; and the construction method comprises the following steps: (1) trial preparing; (2) testing cube compressive strength of concrete; (3) mixing concrete raw materials according to selected materials for trail preparation and components in the mixing ratio; (4) for the concrete, using a casting method for casting at fixed point in a sectional way, casting with one slope, casting in a thin layer, gradually advancing and casting the top at one time, and using a secondary vibrating method, wherein three vibrating gas concretes are placed in front of, in the middle of and behind each concrete layer; (5) covering a plastic film and/or covering a 1 cm thick gunny bag on the concrete after the concrete is finally set and/or a watering and curing the concrete for not less than 14 days; and (6) respectively placing temperature measuring points in the concrete casting vertical height, the edge of the concrete casting surface and the middle part of the concrete casting surface; and measuring the temperatures by using a thermocouple thermometer. The large-volume concrete beneficial for controlling the temperature and the shrinkage crack has the advantages of controllable time and high crack resistance.

Description

technical field [0001] The invention relates to the technical field of civil engineering, in particular to a large-volume concrete which is beneficial to controlling temperature and shrinkage cracks and a construction process thereof. Background technique [0002] With the rapid development of civil engineering construction, concrete has become the largest and most widely used engineering material in the world today. During the use of concrete, it is eroded by harmful media in the soil, water and air, as well as the physical and chemical effects of the harmful components of the concrete material itself, which will cause cracking and peeling, which will further aggravate the occurrence and development of other hazards. How to slow down and reduce the cracking of concrete is very important to the safety, applicability and durability of concrete structures. Premature deterioration, cracking and destruction of concrete structures are also a huge waste of resources and energ...

Claims

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Application Information

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IPC IPC(8): C04B28/02E04G21/02
Inventor 胡志勇焦楚杰丁明浩夏志材李文睿
Owner NO 1 CONSTR ENG CO LTD OF CHINA CONSTR THIRD ENG BUREAU CO LTD
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