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Phosphorus slag-doped active powder concrete and preparation method thereof

A technology of active powder and concrete, which is applied in the field of building materials, can solve the problems of insufficient resource distribution and total quantity, unsatisfactory concrete engineering, low content, etc., achieve excellent frost resistance and chloride ion permeability resistance, promote high-efficiency utilization, The effect of saving resources and energy

Active Publication Date: 2013-08-14
CHINA THREE GORGES UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, although silica fume and slag powder are currently recognized as the best active materials, due to their limited quantity, such as the lack of silica fume resources in my country and the high price, they can no longer meet the needs of concrete engineering.
Other active materials, such as volcanic ash, diatomaceous earth, zeolite powder, pumice powder and rice husk ash, also have the problem of insufficient resource distribution and total amount
However, there is no literature report on the use of phosphorus slag as an active component in RPC
On the one hand, this is due to the Al in phosphorus slag 2 o 3 Low content, containing a certain amount of P 2 o 5 , F and other components, so that its activity, especially the early activity is low; on the other hand, due to the lack of more detailed information on the hydration and hardening characteristics of phosphorus slag on high-strength and ultra-high-strength concrete materials, and the law and mechanism of its influence on microstructure, etc. In-depth and systematic theoretical research and innovation

Method used

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  • Phosphorus slag-doped active powder concrete and preparation method thereof
  • Phosphorus slag-doped active powder concrete and preparation method thereof
  • Phosphorus slag-doped active powder concrete and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0013] Example 1 (there are two products in this example, and their numbers are recorded as 1-1 and 1-2 respectively):

[0014] Phosphorous slag powder reactive powder concrete is prepared from cement, phosphorus slag powder, silica fume, water reducing agent, quartz sand, mixing water and steel fiber by the following method:

[0015] 1) Weighing of raw materials: Weigh each component according to the ratio shown in Table 1. Among them, the cement is P.O42.5, and its 28d compressive strength is 51.0MPa; the specific surface area of ​​phosphorus slag powder is 397m 2 / kg, the fluidity ratio is 96%; the specific surface area of ​​silica fume is 20000m 2 / kg, SiO 2 The content is 91%; the water reducing agent is a non-retarding polycarboxylate high-performance water reducing agent, and the water reducing rate is 30%; the particle size range of quartz sand is 0.16-0.63mm; the steel fiber is copper-plated flat straight micro-steel fiber, The diameter is 0.2mm, the length is 13mm...

example 2

[0022] Example 2 (there are also two products in this example, whose serial numbers are respectively marked as 2-1 and 2-2):

[0023] Phosphorous slag-doped active powder concrete is prepared from cement, phosphorus slag powder, silica fume, water reducing agent, quartz sand, mixing water and steel fiber by the following method:

[0024] 1) Weighing of raw materials: Weigh each component according to the ratio shown in Table 3.

[0025] Table 3 Mixing ratio of phosphorus-doped slag active powder concrete (shown in the table is the parts by mass of each component)

[0026] Numbering

cement

Phosphorus slag powder

Silica fume

Quartz sand

steel fiber

water

Superplasticizer

2-1

50

35

15

100

15.6

14

2.5

2-2

50

35

15

100

15.6

16

2

[0027] Among them, the cement is P.O52.5 cement, the 28d compressive strength is 58.3MPa; the specific surface area of ​​phosphorus slag ...

example 3

[0033] Example 3 (there are still two products in this example, whose serial numbers are recorded as 3-1 and 3-2 respectively):

[0034] Phosphorous slag-doped active powder concrete is prepared from cement, phosphorus slag powder, silica fume, water reducing agent, quartz sand, mixing water and steel fiber by the following method:

[0035] 1) Weighing of raw materials: Weigh each component according to the ratio shown in Table 5. Among them, the cement is PO52.5 cement, the 28d compressive strength is 58.3MPa; the specific surface area of ​​phosphorus slag powder is 423m 2 / kg; fluidity ratio 98%; specific surface area of ​​silica fume 20000m 2 / kg, SiO 2 The content is 96.9%; the water reducing agent is a non-retarding polycarboxylate high-performance water reducing agent, and the water reducing rate is 30%; the particle size range of quartz sand is 0.16-0.63mm; the steel fiber is copper-plated flat straight micro-steel fiber, The diameter is 0.2mm, the length is 13mm, an...

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Abstract

The invention discloses phosphorus slag-doped active powder concrete and a preparation method thereof. The preparation method comprises the following steps of: adopting a material compounding technology on the basis of utilizing gelling performances of phosphorus slag powder; and preparing high-compressive strength active powder concentration by using phosphorus slag powder, silica fume, cement, quartz sand and steel fiber under the normal-pressure steam curing condition of 80-95 DEG C. The active powder cement obtained by the preparation method has compressive strength not less than 180MPa, breaking strength not less than 25MPa and belongs to RPC200 level. Meanwhile, the anti-freezing level is not lower than F350, the chloride ion transport coefficient (RCM process) DRCM is not higher than 1.0-10<-13>m<2> / s, and the chloride penetration resistance reaches RCM-V level. Besides, the phosphorus slag-doped active powder concrete has excellent anti-freezing performances and chloride penetration resistance, can be used for prompting high-efficiency utilization of phosphorus slag, and can be used for saving resource and energy and protecting the environment.

Description

technical field [0001] The invention belongs to the field of building materials, and belongs to a cement-based composite material with ultra-high strength and ultra-high durability, in particular to an active powder concrete mixed with phosphorus slag powder and a preparation method thereof. Background technique [0002] Reactive Powder Concrete (RPC) is a new type of ultra-high performance cement-based composite material that was first developed by Pierre Richard et al. in France in the 1990s. Due to its ultra-high mechanical properties and excellent durability, it has very broad application prospects in modern civil engineering, petroleum, nuclear power, municipal, ocean engineering and military facilities. [0003] The ultra-high performance of RPC is closely related to the active components used and the molding and curing process. Research data show that the active components of traditional RPC are mainly cement, silica fume and quartz powder, and the amount of cement i...

Claims

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Application Information

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IPC IPC(8): C04B28/08
Inventor 彭艳周彭刚徐港柯锦唐俊峰肖文李念孙珩张丹周怡龙
Owner CHINA THREE GORGES UNIV
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