Concrete for precasting magnesium oxide carbonized pile and application thereof

A technology of magnesium oxide carbonized piles and magnesium oxide, which is applied in the direction of sheet pile walls, manufacturing tools, ceramic molding machines, etc., can solve the problems of lack of experimental data, etc., and achieve the effects of good quality stability, good water retention, and sufficient bearing capacity

Inactive Publication Date: 2019-09-10
扬州邗江中科南工建设工程与信息化研究中心
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Carbonization technology based on activated magnesium oxide is a new research direction that has attracted attention in recent years. Only a few scientific research institutions in the world have conducted preliminary research on this technology, and this technology is seriously lacking in relevant experimental data.

Method used

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  • Concrete for precasting magnesium oxide carbonized pile and application thereof
  • Concrete for precasting magnesium oxide carbonized pile and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A concrete formula for prefabricated piles includes the following raw materials by weight: 337.5g of magnesium oxide, 337.5g of cement, 75g of fly ash, 750g of water, 5500g of sand, 8000g of gravel, and 40g of water reducing agent. Inject into a mold with a length of 400 mm, a width of 100 mm, and a height of 100 mm for vibration, and immediately put it into a carbonization box for carbonization curing. After 24 hours, it will be removed from the mold and continue to be cured. 2 The concentration is 20%. When the carbonization reaches 3 days, 7 days, 14 days and 28 days, the block is subjected to a flexural strength test, and the average value of the test strength is taken as the result.

Embodiment 2

[0032] A concrete formula for prefabricated piles includes the following raw materials: magnesia 300g, cement 300g, fly ash 150g, water 750g, sand 5500g, crushed stone 8000g, water reducer 40g, mix the mixture evenly and pour it into the specification Vibrate in a mold with a length of 400mm, a width of 100mm, and a height of 100mm, immediately put it into a carbonization box for carbonization curing, demould after 24 hours and continue curing. The parameters of the carbonization box are controlled at 20°C, 60% humidity, and 2 The concentration is 20%. When the carbonization reaches 3 days, 7 days, 14 days and 28 days, the block is subjected to a flexural strength test, and the average value of the test strength is taken as the result.

Embodiment 3

[0034] A concrete formula for prefabricated piles includes the following raw materials: 262.5g of magnesium oxide, 262.5g of cement, 225g of fly ash, 750g of water, 5500g of sand, 8000g of gravel, and 40g of water reducing agent. Inject into a mold with a length of 400 mm, a width of 100 mm, and a height of 100 mm for vibration, and immediately put it into a carbonization box for carbonization curing. After 24 hours, it will be removed from the mold and continue to be cured. 2 The concentration is 20%. When the carbonization reaches 3 days, 7 days, 14 days and 28 days, the block is subjected to a flexural strength test, and the average value of the test strength is taken as the result.

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Abstract

The invention discloses concrete for precasting a magnesium oxide carbonized pile and application thereof, belonging to the field of building materials. Through improving a raw material ratio, namelythe ratio of powder obtained by mixing magnesium oxide and coal ash in the raw materials, a novel concrete formula for the precast pile is obtained. A precasting method includes 1) assembling a steelbar cage; 2) cleaning a mold and coating the inner wall of the mold with a layer of engine oil before mold filling; 3) paving concrete on the bottom of the mold, putting the steel bar cage into the mold to vibrate for compaction, uniformly pouring and feeding, and then performing segmented pouring and vibrating for compaction; 4) curing a molded semi-finished product pile in a carbonization case for 24 h, and then demolding to obtain the magnesium oxide carbonized pile. The pile is good in quality stability and cheap, the production cost is easy to control, and the pile has adequate carrying capacity, small transport and pouring amounts, and reduced material and energy consumption.

Description

technical field [0001] The invention relates to the field of civil engineering building materials, in particular to a prefabricated concrete for magnesium oxide carbonized piles and an application thereof. Background technique [0002] Prestressed high-strength concrete pipe piles (PHC pipe piles) are widely used in various engineering structures such as industrial and civil buildings, road and railway bridges, and port terminals. With the deepening of theoretical research on high-strength concrete, the experimental research on various properties of high-strength concrete under the new preparation technology is also more extensive. The large-scale use of traditional PHC pipe pile preparation materials has seriously damaged the cultivated land resources, and its main raw material, Portland cement, has huge environmental problems. [0003] Starting from environmental protection, a new type of cement mixed with activated magnesia and ordinary Portland cement was invented. The...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/10B28B23/04E02D5/30E02D5/58
CPCB28B23/04C04B28/10C04B2111/00017C04B2201/50E02D5/30E02D5/58C04B18/08C04B14/06C04B14/02C04B2103/302
Inventor 张鹤年沈晨席培胜陈凯祥汪少涵
Owner 扬州邗江中科南工建设工程与信息化研究中心
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