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Design and preparation method of a construction waste powder-based ecological ultra-high performance concrete

A construction waste and ultra-high performance technology, which is applied in the design and preparation of construction waste powder-based ecological ultra-high performance concrete, can solve problems such as fluidity, poor pumping performance, impact on engineering construction, and complex composition. achieve the effect of reducing waste

Inactive Publication Date: 2021-08-13
中安瑞宝建设集团有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, there are not many studies on the design and preparation of ultra-high performance concrete, especially ultra-high-strength (above 100 MPa) cement-based materials.
Most researchers directly give the mix ratio of ultra-high-strength cement-based materials, and the design of concrete mix ratios is still based on experiments and experience, without systematic research on the design and preparation methods of cement-based materials, which may lead to Under the cement-based material system, various materials have not been efficiently utilized. At the same time, due to the complex composition of construction waste powder-based materials and uneven particle size distribution, the viscosity of the slurry in the ultra-high-strength cement-based material low water-binder ratio system High, poor fluidity and pumping performance, which affect engineering construction. At the same time, how to replace cement, sand, and mineral admixtures with construction waste to the greatest extent, meet the performance requirements of ultra-high performance concrete, and achieve green environmental protection and sustainable development

Method used

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  • Design and preparation method of a construction waste powder-based ecological ultra-high performance concrete
  • Design and preparation method of a construction waste powder-based ecological ultra-high performance concrete
  • Design and preparation method of a construction waste powder-based ecological ultra-high performance concrete

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Embodiment 1

[0042] A design and preparation method of construction waste powder-based ecological ultra-high performance concrete, comprising the following steps:

[0043] Select 52.5P.O. cement (Cement), silica fume (Silica Fume) and fly ash (Fly Ash) (where silica fume and fly ash are used as mineral admixtures), construction waste powder (construction and demolition wastes), River sand, active activator, water, and polycarboxylate superplasticizer are used as raw materials.

[0044] Step (1), determine the composition and bulk density of the construction waste powder, and test the particle size distribution of the powder, such as figure 1 As shown, determine the particle size and particle size distribution curve corresponding to the volume distribution of 10%, 50%, and 90%;

[0045] The specific implementation process of step (1) is as follows:

[0046] 1.1. Collect construction waste powder;

[0047] 1.2. Determine the composition of the construction waste powder, the specific deter...

Embodiment 2

[0092] The purpose of this embodiment is to also provide a method for determining the composition of raw materials used to prepare construction waste powder-based ecological ultra-high performance concrete, including the following steps:

[0093] Step (1), determine the composition and bulk density of the construction waste powder, and test the particle size distribution of the powder, such as figure 1 As shown, determine the particle size and particle size distribution curve corresponding to the volume distribution of 10%, 50%, and 90%;

[0094] The specific implementation process of step (1) is as follows:

[0095] 1.1. Collect construction waste powder;

[0096] 1.2. Determine the composition of the construction waste powder, the specific determination method is as follows: For example, the composition of the collected construction waste powder can be determined by X-ray energy spectrum or X-ray diffraction or X-ray fluorescence spectrum. In this embodiment, it is determi...

Embodiment 3

[0143] The purpose of this embodiment is to also provide a kind of construction waste powder-based ecological ultra-high performance concrete. In parts by weight, the composition includes 401-536 parts of cement, 200-202 parts of fly ash, and 186-189 parts of silica fume. 213-432 parts of construction waste powder, 818-904 parts of river sand, 14-31 parts of active activator, 30-31 parts of polycarboxylate superplasticizer and 210-212 parts of water.

[0144] The construction waste powder-based ecological ultra-high-performance concrete disclosed in this embodiment uses construction waste powder to replace cement, which can reduce the amount of cement, and can prepare ultra-high-performance concrete with excellent performance (compressive strength and rheological properties). Realize energy saving and emission reduction and sustainable development of building materials.

[0145] Among them, the construction waste powder can be selected as construction waste with a particle siz...

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Abstract

The invention relates to a design and preparation method of construction waste powder-based ecological ultra-high performance concrete. The method includes the following steps: (1) determining the composition and bulk density of construction waste powder; (2) determining the bulk density of cement, mineral admixture, and sand; (3) establishing construction waste powder, cement, and mineral admixture (4) Determine the type of active activator; (5) Determine the water-binder ratio of concrete; (6) Determine the saturated dosage of different water reducers; (7) Determine the water reducer amount, and determine the concrete formula; (8) weigh each raw material according to the concrete formula determined in step (7), and mix and stir the raw materials. The invention can avoid preparing concrete by empirical means, reduce waste and waste of concrete due to improper design, reduce cement consumption, prepare ultra-high-performance concrete with excellent performance, and realize energy saving and emission reduction and sustainable development of building materials.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a design and preparation method of construction waste powder-based ecological ultra-high performance concrete. Background technique [0002] Ultra-high performance concrete is different from traditional high-strength concrete and steel fiber concrete, and it is not a high-strength high-performance concrete in the traditional sense, but a new variety of cement-based structural engineering materials with clear performance indicators. Its real value is reflected in the realization of lightweight, high-strength, low-porosity ultra-high-strength cement substrates for concrete structures. In the state of no cracks, the gas and liquid permeability of ultra-high performance concrete is very low; in the state of high strain and micro-cracks, the permeability of ultra-high-performance concrete can also be kept at a low level, and the micro-cracks also have good self-...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G16C60/00G16C20/20G16C20/70
Inventor 陈嘉奇邓加龄余睿陈浩马东华
Owner 中安瑞宝建设集团有限公司
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