Ecological nanometer photocatalysis completely recycled concrete

A technology of recycled concrete and nano-light, which is applied in the field of building materials, can solve the problems of not having to decompose exhaust gas, and achieve the effects of obvious ecological and environmental protection effects, optimized atmospheric environment, and stable and controllable quality

Active Publication Date: 2015-01-28
NINGBO INST OF TECH ZHEJIANG UNIV ZHEJIANG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional pavement materials do not have the function of decomposing exhaust gas, so it is urgent to develop a pavement material with the function of purifying air pollutants

Method used

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  • Ecological nanometer photocatalysis completely recycled concrete

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Calculated by weight components, the raw material components of the concrete in this example are as follows: 370 parts of cement, 1172 parts of photocatalyst-loaded coarse aggregate, 578 parts of fine aggregate, 50 parts of auxiliary cementitious material, and 4 parts of naphthalene-based high-efficiency water reducer part, 150 parts of water.

[0028] The preparation steps are: (1) First, crush the waste concrete block, and after sieving to obtain the regenerated coarse aggregate whose particle size, gradation and physical properties meet the requirements in the above formula, soak the regenerated coarse aggregate in the photocatalyst 24 hours, take it out, and dry it at 90-105°C to constant weight; then sieve the remaining particles to obtain recycled fine aggregate whose particle size and gradation meet the requirements in the above formula; finally, the remaining recycled concrete powder Composite grinding with slag powder to obtain an auxiliary gelling material who...

Embodiment 2

[0032] Calculated by weight, it includes 425 parts of cement, 1113 parts of photocatalyst-loaded coarse aggregate, 552 parts of fine aggregate, 75 parts of auxiliary cementitious material, 5 parts of naphthalene-based superplasticizer, and 165 parts of water.

[0033] The preparation method is the same as in Example 1.

[0034] The technical indicators of the ecological nano-photocatalytic fully recycled concrete prepared in this example: the 28d compressive strength is 45.8MPa, and the 28d bending tensile strength is 4.6MPa, meeting the mechanical performance requirements of pavement materials. The concrete is continuously passed through NO with a concentration of 30ppm under simulated sunlight conditions. 2 Tests were carried out, and the photocatalytic rate reached 72.2%.

Embodiment 3

[0036] Calculated by weight, it includes 465 parts of cement, 1085 parts of photocatalyst-loaded coarse aggregate, 565 parts of fine aggregate, 85 parts of auxiliary cementitious material, 8 parts of polycarboxylate superplasticizer, and 165 parts of water.

[0037] The preparation method is the same as in Example 1.

[0038] The technical indicators of the ecological nano-photocatalytic fully recycled concrete prepared in this example: the 28d compressive strength is 58.8MPa, and the 28d bending tensile strength is 5.6MPa, meeting the mechanical performance requirements of pavement materials. The concrete is continuously passed through NO with a concentration of 30ppm under simulated sunlight conditions. 2 Tests were carried out, and the photocatalytic rate reached 69.6%.

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Abstract

The invention discloses an ecological nanometer photocatalysis completely recycled concrete. The concrete is prepared from following components in parts by weight: 360-480 parts of cement, 1000-1200 parts of loaded photocatalyst coarse aggregate, 500-600 parts of fine aggregate, 40-90 parts of supplementary cementious material, 4-10 parts of efficient water reducing agent, and 150-180 parts of water. The cement has the advantages that regenerated coarse aggregate, regenerated fine aggregate and regenerated concrete powder produced by waste concrete are used for preparing the concrete, so that full utilization of the waste concrete and zero resource waste are really realized, and the ecological environmental protection effect is obvious; the nanometer photocatalysis component is loaded in the regenerated coarse aggregate for the first time, so that the concrete can decompose vehicle exhaust and improve the atmospheric environment.

Description

technical field [0001] The invention belongs to the field of building materials, and relates to an ecological nano-photocatalytic fully-regenerated (that is, to utilize all regenerated coarse aggregate, regenerated fine aggregate and regenerated powder obtained in the waste concrete disposal process) concrete. Background technique [0002] With the increase of infrastructure construction, a large amount of waste concrete will be produced in the process of demolition and construction of new ones. If it is not used rationally, it will seriously affect the ecological environment. During the disposal of waste concrete, recycled coarse aggregate, recycled fine aggregate and recycled powder can be obtained. At present, only recycled coarse aggregate and recycled fine aggregate are usually used to prepare recycled concrete, which leads to the inability to effectively utilize recycled powder. In order to realize the complete recycling of waste concrete and achieve ecological effect...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/00C04B18/16
CPCY02W30/91
Inventor 徐亦冬沈建生
Owner NINGBO INST OF TECH ZHEJIANG UNIV ZHEJIANG
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