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Mineral blending material for producing PHC (Pyrolysis Hydrocarbon) tubular pipe free from high pressure steaming process as well as application

A mineral admixture, high-pressure steam curing technology, applied in the field of mineral admixtures, can solve the problems of difficult to meet construction, low early activity, complex process, etc., to achieve good economic and environmental benefits, simple ingredients, raw material sources wide range of effects

Active Publication Date: 2014-06-25
TONGJI UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although existing mineral admixtures such as blast furnace slag, fly ash, metakaolin, and coal gangue can improve the durability of concrete, their early activity is low, and it is difficult to meet the requirements for the construction of concrete prefabricated products that require early strength.
A large number of prestressed high-strength concrete (PHC) pipe piles in construction projects generally require 1 to 3 days to reach a strength grade of C80 or above. In factories, two curing processes, normal pressure steam curing and high pressure steam curing, are generally used to make the concrete reach Design strength requirements, complex process, high energy consumption

Method used

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  • Mineral blending material for producing PHC (Pyrolysis Hydrocarbon) tubular pipe free from high pressure steaming process as well as application
  • Mineral blending material for producing PHC (Pyrolysis Hydrocarbon) tubular pipe free from high pressure steaming process as well as application
  • Mineral blending material for producing PHC (Pyrolysis Hydrocarbon) tubular pipe free from high pressure steaming process as well as application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment l

[0031] Evenly mix 80% of superfine blast furnace slag powder and 20% of desulfurized gypsum according to the weight ratio to obtain a high-performance mineral admixture for the production of PHC pipe piles without autoclaving.

[0032] Mix 20% of the mineral admixture used in the production of PHC pipe piles without high-pressure steam-curing process with 80% of PⅡ52.5 cement to obtain a composite cementitious material. Compared with the standard mortar strength of pure cement, the sand strength is 115% in 1 day, 117% in 3 days, and 111% in 28 days. It has good stability and flow ratio is 103%. ; In addition, other performance indicators of the mineral admixture are as follows: loss on ignition is 2.0%, chloride ion content is 0.014%, and moisture content is 0.5%.

[0033] The steaming system is as follows: static stop for 90 minutes, static stop temperature of 40°C, heating section: 40°C to 90°C, heating time of 90 minutes, constant temperature at 90°C for 4.5 hours, cooling ...

Embodiment 2

[0035] 70% of superfine blast furnace slag powder and 30% of desulfurized gypsum are evenly mixed according to the weight ratio to obtain a high-performance mineral admixture for the production of PHC pipe piles without autoclaving.

[0036] Mix 20% of the mineral admixture used to produce PHC pipe piles without high-pressure steam curing process with 80% of PⅡ52.5 cement to obtain a composite cementitious material, and its basic properties can reach respectively: Compared with the benchmark mortar strength of pure cement, the mortar strength under the steam curing system has a 1-day compressive strength ratio of 116%, a 3-day compressive strength ratio of 118%, and a 28-day compressive strength ratio of 112%. The stability is good , The flow ratio is 104%; In addition, other performance indicators of the mineral admixture are as follows: loss on ignition is 2.0%, chloride ion content is 0.014%, and moisture content is 0.5%.

Embodiment 3

[0038] 60% of superfine blast furnace slag powder and 40% of desulfurized gypsum are evenly mixed according to the weight ratio to obtain a high-performance mineral admixture for the production of PHC pipe piles without autoclaving.

[0039] Mix 20% of the high-performance mineral admixture used to produce PHC pipe piles without autoclaving with 80% of PⅡ52.5 cement to obtain a composite cementitious material, and its basic properties can respectively reach: Compared with the benchmark mortar strength of pure cement under the steam curing system, the mortar strength ratio is 112% at 1 day, 113% at 3 days, and 111% at 28 days. Good performance, the flow ratio is 96%; in addition, other performance indicators of the mineral admixture are as follows: loss on ignition is 2.3%, chloride ion content is 0.015%, and moisture content is 0.5%.

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Abstract

The invention discloses a mineral blending material for producing a PHC (Pyrolysis Hydrocarbon) tubular pipe free from a high pressure steaming process. The mineral blending material comprises the components in percentage by weight as follows: 60-80% of superfine blast furnace slag micropowder and 20-40% of desulfurization gypsum. According to the mineral blending material, the loss on ignition is less than or equal to 3%, the chlorine ion content is less than or equal to 0.02% and the water content is less than or equal to 1.0%. The mineral blending material provided by the invention is in particular suitable for preparing concrete for producing the PHC tubular pipe free from the high pressure steaming process and can replace 15-25% of cement equivalently. The prepared concrete has the advantages of high strength in early stage, continuous development of strength in later stage, good durability and the like. In the production process of the PHC tubular pipe, the high pressure steam maintenance link is omitted, so that the demand on the production device and the production energy consumption are reduced. According to the invention, industrial wastes such as flue gas desulfurization gypsum in a power plant are used as main materials, so that the materials are wide in source and low in cost. Meanwhile, the environmental pollution caused by industrial residue is reduced, and good economic and environment-friendly benefits are obtained.

Description

technical field [0001] The invention belongs to the technical field of building materials, and relates to a mineral admixture used in the production of prestressed high-strength concrete (PHC) pipe piles by a high-pressure steam curing process and an application thereof. Background technique [0002] Adding mineral admixtures (such as finely ground slag, fly ash, silica fume, etc.) many performances. Adding a large amount of mineral admixtures when configuring concrete can reduce temperature rise, improve workability, increase later strength, improve the internal structure of concrete, and improve corrosion resistance. Therefore, this mixed material is called auxiliary cementitious material, which is an indispensable component of high-performance (not only high-strength) concrete. Although the existing mineral admixtures such as blast furnace slag, fly ash, metakaolin, and coal gangue can improve the durability of concrete, their early activity is low, and it is difficult ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B22/14C04B18/30
CPCY02W30/91
Inventor 朱敏涛张雄邱晔晟
Owner TONGJI UNIV
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