Machine-made sand pump concrete and preparation method thereof

A technology for pumping concrete and machine-made sand, which is applied in the field of building materials, can solve the problems of restricting the universal use of machine-made sand and the inability to widely use machine-made sand, and achieve significant economic and ecological benefits, reduce over-reliance and mining, and protect the ecological environment Effect

Inactive Publication Date: 2017-08-08
SHIJIAZHUANG TIEDAO UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the characteristics of machine-made sand concrete deviate from those of pumped concrete, so that machine-made sand cannot be widely used, thus limiting the widespread use of machine-made sand

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0026] A kind of preparation method of machine-made sand pumping concrete provided by the invention comprises the following steps:

[0027] Step 1: First mix the machine-made sand with fly ash to dry mix to prepare the premix, the mass ratio of machine-made sand to fly ash is machine-made sand: fly ash=1:0.04~1:0.09;

[0028] In step 2, the premix is ​​added to other machine-made sand pumping concrete raw materials and mixed into machine-made sand pumping concrete.

[0029] The mass ratio of machine-made sand and fly ash in the premix is ​​related to the design strength grade of concrete. Generally, the strength grade of concrete used is in the range of C30-C50. In this range, the mass ratio of machine-made sand to fly ash is about : Fly ash=1:0.04~1:0.09.

[0030] Machine-made sand is used as the base material, and its function is to fill the gaps of coarse aggregate, reduce the friction coefficient between concrete and the pump pipe wall, and increase the water-retaining pe...

Embodiment 1

[0053] The design strength grade of concrete is C30, the total amount of glue is 1 part, and the dosage is 357kg / m 3 , of which fly ash accounts for 30% of the total amount of adhesive materials, cement accounts for 60% of the total amount of adhesive materials, a kind of ultrafine stone powder with a fineness of 1000 mesh accounts for 10%, and machine-made sand premix is ​​2.15 parts, of which premixed The proportion of fly ash replacing machine-made sand in the material is 10%, and the mixing time of fly ash and machine-made sand is 30s. The stone powder content in the machine-made sand is 13%, the mass ratio of the premix material to the total aggregate is 46%, and the coarse aggregate crushed stone accounts for 2.8 parts (wherein the particle size is 10-20mm and the particle size is 5-10mm). The mass ratio is 8:2), put the above raw materials into the mixer and dry mix for 60s, then add 0.39 parts of water and polycarboxylate high-efficiency water-reducer mixture, where th...

Embodiment 2

[0055] The design strength grade of concrete is C50, the total amount of glue is 1 part, and the dosage is 475kg / m 3， Among them, cement accounts for 70% of the total amount of adhesive materials, fly ash accounts for 20% of the total amount of adhesive materials, a kind of ultrafine stone powder with a fineness of 1000 mesh accounts for 10%, and machine-made sand premixes account for 1.62 parts, of which fly ash The proportion of replacing machine-made sand is 4%, and the mixing time of fly ash and machine-made sand is 30s. The stone powder content in the machine-made sand is 13%, the mass ratio of the premix material to the total aggregate is 46%, and the coarse aggregate crushed stone accounts for 1.9 parts (wherein the particle size is 10-20mm and the particle size is 5-10mm). The mass ratio is 8:2), put the above raw materials into the mixer and dry mix for 60s, then add 0.33 parts of water and polycarboxylate high-efficiency water reducer mixed solution, the amount of wa...

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Abstract

The invention discloses machine-made sand pump concrete and a preparation method thereof, and belongs to the technical field of building materials. The preparation method comprises the following steps that firstly, machine-made sand is doped with pulverized fuel ash and then subjected to dry mixing to obtain a pre-mixed material, wherein the mass ratio of the machine-made sand to the pulverized fuel ash is 1:0.04 to 1:0.09; and secondly, other raw materials are added into the pre-mixed material and are stirred to prepare the machine-made sand pump concrete. According to the machine-made sand pump concrete and the preparation method thereof, the graduation and fineness modulus of fine aggregate are improved by doping the pulverized fuel ash to replace natural sand, and superfine stone powder is adopted as blending stock to be charged into gaps between grains of cementing materials such as cement, so that the pump concrete is prepared; and the concrete mixed through the method has the characteristics of being good in workability and fluidity, high in pumpability, low in water consumption and the like, the machine-made sand is widely applied to various pump concrete in the fields of industrial and civil construction and the like, immoderate dependence on and over exploitation for natural sand resources are reduced, the ecological environment is protected, and the economic and ecological benefits are remarkable.

Description

technical field [0001] The invention relates to the technical field of building materials. Background technique [0002] At present, there is a shortage of natural sand resources in our country, and the price has risen. Driven by economic interests, random mining and digging of natural sand have occurred in many areas of our country. Especially in the past few years, the situation of destroying fields and rivers to dig sand Occurs from time to time, destroying limited cultivated land, flood control dams, and thus causing many engineering accidents. Therefore, it is necessary to use widely distributed rocks or construction waste generated in construction to process and produce machine-made sand instead of natural sand. Replacing the traditional river sand with machine-made sand can reduce the loss of water and soil caused by the mining of a large amount of river sand, and reduce the damage to the river bed, and the machine-made sand can be produced by using the waste of grav...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/02
CPCC04B28/02C04B18/08C04B14/04C04B14/02C04B2103/302
Inventor 籍凤秋孙志芳王江水张佩刘福鹏刘恒权宋洪军欧阳云鹏胡凯凯杨硕
Owner SHIJIAZHUANG TIEDAO UNIV
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