Internal curing sand for special concrete as well as preparation method and application thereof

A concrete and special technology, applied in the direction of sustainable waste treatment, solid waste management, climate sustainability, etc., can solve the problems of reducing the expansion rate of self-shrinkage and drying shrinkage expansion concrete, high bulk density, high water absorption, etc. Achieve the effect of reducing self-shrinkage, high bulk density and high water absorption

Pending Publication Date: 2020-11-06
江苏智晟节能科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This kind of internal curing sand has small particle size, high bulk density, high strength and high water absorption rate, and is evenly distributed in concrete. It has good internal curing, reduces self-shrinka

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A preparation method of internal curing sand for special concrete, specifically as follows:

[0028] (1) The raw material weight ratio of internal curing sand for special concrete is as follows: 35% of waste ALC tails crushed to 0.5-3mm saturated surface dry state, 45% of cement-based materials, and 20% of water.

[0029] (2) Saturate the ALC granules with water first, then put the cement-based material into the horizontal multifunctional mixer from the first feeding port at the front end, and put the ALC that has absorbed water from the second feeding port at the front end In the multi-functional mixer, water mist spraying devices are installed every 1.5m, each component is accurately measured, and the shell is wrapped and compacted. The length of the mixer is controlled to be 8-10m, so that the particle size of the product is 1.0-5.0mm , which is internal curing sand.

[0030] (3) Carry out thermal insulation and moisturizing maintenance on the formed internal curing...

Embodiment 2

[0032] A preparation method of internal curing sand for special concrete, specifically as follows:

[0033] (1) The raw material weight ratio of internal curing sand for special concrete is as follows: 35% of foam board tail particles in a saturated surface dry state crushed to 1-3mm, 45% of cement-based materials, and 20% of water.

[0034] (2) First saturate the tail grains of the foam board with water, put the cement-based material into the pellet surface treatment machine from the first feeding port at the front end, and put the water-absorbing foam board tail grains from the second feeding port at the front end, In the granular material surface treatment machine, water mist spraying devices are installed every 1.2m, and each component is accurately measured, and then shelled and compacted. That is, internal curing sand.

[0035] (3) Carry out thermal insulation and moisturizing maintenance on the formed internal curing sand to make it develop strength, that is, the inter...

Embodiment 3

[0037] The high water-absorbing internal curing sand prepared in Example 1 is applied to the preparation of high-strength concrete of strength grade C80, specifically as follows:

[0038] (1) The mixing ratio of strength grade C80 high-strength concrete: cement 438kg, I grade fly ash 72kg, S95 slag powder 90kg, middle sand 600kg, stone 1050kg, the internal curing sand (made in embodiment 1, the same below) of saturated surface dryness ) 72kg, PCA superplasticizer 7.2kg, water 140kg.

[0039] (2) Weighing, mixing and curing according to the conventional method, and at the same time, make a group of concrete with the same proportion and no internal curing sand (the amount of medium sand is 700kg), and test the performance of its high-strength concrete.

[0040] (3) The high-strength concrete prepared by the aforementioned process all meets the designed pumping construction requirements. The 3-day compressive strength is 55MPa, which is similar to the comparison group, and the 7-...

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Abstract

The invention discloses internal curing sand for special concrete as well as a preparation method and application of the internal curing sand. The internal curing sand is a core-shell inorganic spherical particle, the particle size of the internal curing sand is 1.0-6.0 mm, the wet bulk density of the internal curing sand in a saturated surface dry state is 800-1200 kg/m <3>, the cylinder compressive strength of the internal curing sand is greater than 6.0 MPa, and the water absorption rate of the internal curing sand is greater than 20%. The internal curing sand is prepared from waste materials, and is small in particle size, high in strength, large in stacking density and high in water absorption rate. The mixing amount of the internal curing sand in special concrete accounts for 10-30%of the use amount of a cementing material, and the internal curing sand can improve workability, reduce bleeding rate, improve pumpability, promote hydration of cement in concrete, significantly reduce self-shrinkage of high-strength concrete, improve expansion rate of expansive concrete, obviously improve crack resistance of the concrete and improve middle and later strength of the concrete. Theinternal curing sand of the invention is especially used for high-strength and ultrahigh-strength concrete, expansive concrete, fair-faced concrete and special structural concrete which is difficult to maintain.

Description

technical field [0001] The invention belongs to the field of civil engineering materials, and in particular relates to an internal curing sand for special concrete, a preparation method and application thereof. Background technique [0002] With the development of the construction industry, there are more and more high-rise buildings, large bridges and large prefabricated components in my country. In order to meet the requirements of construction, high-strength and ultra-high performance concrete, expansion and self-stressing concrete, high-strength self-compacting fair-faced concrete and other special concrete applications And more and more. [0003] The water-binder ratio of high-strength and ultra-high-strength concrete is small, and the cementitious material cannot be fully hydrated. The self-shrinkage of concrete increases with the decrease of the water-binder ratio, and even reaches more than 50% of the total shrinkage, which is easy to cause concrete shrinkage cracks a...

Claims

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Application Information

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IPC IPC(8): C04B18/16C04B14/06
CPCC04B40/0039C04B14/06Y02W30/91
Inventor 秦鸿根庞超明
Owner 江苏智晟节能科技股份有限公司
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