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Low-grade machine-made sand hectometer-height pumping concrete

A technology for pumping concrete and machine-made sand, which is applied in the field of building materials, can solve the problems of high cost and low height, and achieve the effects of low cost, good construction workability and low frictional resistance

Active Publication Date: 2008-05-21
CHINA RAILWAY 12TH BUREAU GRP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem that the primary pumping height of the existing low-grade pumped concrete is relatively low, and high-quality river sand is often used to cause high cost, the present invention provides a low-grade machine-made sand 100-meter elevation pumped concrete

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A low-grade machine-made sand 100-meter-high pumping concrete. Each cubic concrete is made of the following raw materials in the weight ratio: 300kg of cement, using P.O32.5R cement; 90kg of fly ash, which is secondary fly ash, and its fine The density is 12.8%, the water demand ratio is 101%, and the loss on ignition is 6.03%; the machine-made sand is 750kg, and its apparent density is 2680kg / m 3 , bulk density is 1560kg / m 3 , the stone powder content is 6.0%, the porosity is 42%, the fineness modulus is 3.5; the crushed stone is 1000kg, the continuous gradation is 5-31.5mm, and the apparent density is 2700kg / m 3 , the crushing index is 8.0%, the porosity is 40%; the water is 170kg / m 3 , Composite additive 3kg, adopt the RT-B3 type composite additive produced by Shanxi Wanrong Yonghong Composite Additive Company, the gas content is 3.1%, and the compressive strength ratio is 123% after 28 days.

Embodiment 2

[0025] A low-grade machine-made sand 100-meter-high pumping concrete, each cubic concrete is made of the following raw materials in the weight ratio: cement 310kg, using P.O32.5R cement; fly ash 100kg / m 3 , is secondary fly ash, its fineness is 12.8%, water demand ratio is 101%, loss on ignition is 6.03%; machine-made sand is 780kg, and its apparent density is 2680kg / m 3 , bulk density is 1560kg / m 3 , the stone powder content is 6.0%, the porosity is 42%, the fineness modulus is 3.5; the crushed stone is 1100kg, the continuous gradation is 5-31.5mm, and the apparent density is 2700kg / m 3 , the crushing index is 8.0%, the porosity is 40%; the water is 180kg / m 3 , Composite additive 4kg, adopt the RT-B3 type composite additive produced by Shanxi Wanrong Yonghong Composite Additive Company, the gas content is 3.1%, and the compressive strength ratio is 123% after 28 days.

Embodiment 3

[0027] A low-grade machine-made sand 100-meter elevation pumping concrete, each cubic concrete is made of the following raw materials in weight ratio: 302kg of cement, using P.O32.5R cement; 92kg of fly ash, which is secondary fly ash, its fine The density is 12.8%, the water demand ratio is 101%, and the loss on ignition is 6.03%; the machine-made sand is 775kg, and its apparent density is 2680kg / m 3 , bulk density is 1560kg / m 3 , the content of stone powder is 6.0%, the porosity is 42%, and the fineness modulus is 3.5; the crushed stone is 1030kg, with a continuous gradation of 5-31.5mm, and the apparent density is 2700kg / m 3 , the crushing index is 8.0%, and the porosity is 40%; 178kg of water, 3.8kg of composite additives, using RT-B3 type composite additives produced by Shanxi Wanrong Yonghong Composite Additives Company, with an air content of 3.1%, and a compressive strength ratio of 123% in 28 days.

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Abstract

The invention relates to the building material technical field, in particular to a low grade machine-made sand one hundred elevation pumping concrete, which solves problems that the first grade pumping height of an existing low grade pumping concrete is low and the cost of most adopted river sands with high quality is high. The concrete per cube is made from the raw materials with the following weight ratio of 300-310kg of cement, 90-100kg of fly ash, 750-780kg of machine-made sand, 1000-1100kg of gravels, 170-180kg of water and 3-4kg of compound admixture. The invention adopts the raw materials of the machine-made sand, low content cement, etc. to prepare low grade concrete through a series of optimization tests, which has the advantages of good fluidity, no segregation, small frictional resistance, good viscoplasticity, good pumpability and good construction workability. The first grade vertical pumping height can reach to 100m above. The invention is especially applied to the constructions in mountain areas with precipitous terrain. And the machine-made sand is adopted to replace river sand, which leads to the lower cost.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a low-grade machine-made sand 100-meter elevation pumping concrete. Background technique [0002] It is known that the pumpability requirement of pumped concrete is that the concrete moves forward at a constant velocity and in a plunger shape under the push of the pump pressure. The cement slurry or cement mortar in the concrete is squeezed to the periphery under pressure, forming a thin layer of cement slurry or cement mortar between the concrete core column and the pipe wall, so the pumped concrete in the pipe can be divided into parts adjacent to the pipe wall The water film layer, followed by the grout layer, and the concrete core column in the middle, the water film layer and the grout layer are the lubricating layer for the concrete core column to flow in the pipeline, and the concrete core column is suspended in the lubricating layer. The resistance of the deli...

Claims

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Application Information

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IPC IPC(8): C04B28/00C04B18/08C04B14/06C04B14/02
CPCC04B2111/00146C04B28/02Y02W30/91C04B14/02C04B14/06C04B18/08C04B20/0076C04B38/0074
Inventor 胡明文王金柱
Owner CHINA RAILWAY 12TH BUREAU GRP
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