CN105036651A - Desert sand concrete - Google Patents

Abstract

The invention discloses desert sand concrete. According to the raw materials for preparing the desert sand concrete, the water-binder ratio is 0.4, the cement-sand ratio is 1/2-1/1, the desert sand replacement rate is 15%-25%, the fly ash blending volume is 10%-15%, and a water reducing agent accounts for 1.0%-1.5%. In the raw materials of the concrete, part of desert sand replaces building sand, and therefore the building energy consumption can be reduced; the principles of adjusting measures to local conditions, using local materials and reasonably developing and utilizing natural resources are followed, and not only can the supply and demand contradiction of the building sand be effectively relieved, but also rich resources of the desert sand in Xinjiang are fully utilized.

Description

desert sand concrete

technical field

The invention relates to the field of concrete preparation, in particular to desert sand concrete.

Background technique

With the rapid development of society and the rapid advancement of urbanization, the proportion of building energy consumption in the total energy consumption of society is increasing. Due to irreplaceable advantages such as low price and simple preparation, concrete is still the most widely used man-made material in the world today. With the sharp increase in engineering volume and the relevant national management regulations on sand and gravel collection, the contradiction between supply and demand of construction sand has become increasingly prominent.

Contents of the invention

In order to solve the above problems, the present invention provides a desert sand concrete, in which part of the desert sand is used to replace construction sand in the raw materials of the concrete, which can reduce building energy consumption, and follow the principles of adapting measures to local conditions, obtaining local materials, and rationally developing and utilizing natural resources The principle not only effectively alleviates the contradiction between supply and demand of construction sand, but also makes full use of the rich resources of desert sand in Xinjiang.

In order to achieve the above object, the technical scheme that the present invention takes is:

Desert sand concrete is prepared from the following raw materials: water-binder ratio is 0.4, lime-sand ratio is 1/2-1/1, desert sand replacement rate is 15%-25%, and fly ash content is 10%. -15%; water reducing agent is 1.0%-1.5%.

Wherein, the cement is Portland cement; the sand is washed river sand from Manas River in Xinjiang, medium sand, fineness modulus MX=2.93, and bulk density 1560kg/m ³ .

Wherein, the stones are pebbles, the maximum particle size Dmax=25mm, and the bulk density is 2650kg/m ³ .

Wherein, the desert sand is Gurbantunggut desert sand, which is floating sand on the surface of 150 regiments in the Jungar Basin, Xinjiang, with an average particle size of 0.183mm and MX=0.334.

Wherein, the fineness of the fly ash is 6.0%, the loss _on ignition is 1.92%, the moisture content is 0.1%, the SO2 content is 0.2%, and the water demand ratio is 92%.

Among them, the water-binder ratio is 0.4, the lime-sand ratio is 1/1, the desert sand replacement rate is 20%, the fly ash content is 15%, and the water reducer is 1.5%.

Wherein, the water reducer adopts HSC polycarboxylate high-performance water reducer.

The present invention has the following beneficial effects:

Among the raw materials of concrete, substituting part of desert sand for construction sand can reduce construction energy consumption, and follow the principles of adapting measures to local conditions, obtaining local materials and rationally developing and utilizing natural resources, which not only effectively alleviates the contradiction between supply and demand of construction sand, but also fully Utilize the rich resources of desert sand in Xinjiang.

Detailed ways

In order to make the objects and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the examples. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

In the following examples, the cement adopts Portland cement; the sand adopts the washed river sand of Manas River in Xinjiang, medium sand, the fineness modulus MX=2.93, and the bulk density is 1560kg/m ³ ; 25mm, bulk density is 2650kg/m ³ ; desert sand adopts Gurbantunggut desert sand, which is floating sand on the surface of 150 regiments in Junggar Basin, Xinjiang, with an average particle size of 0.183mm, MX=0.334, and its chemical composition is as follows Table 1 shows.

Table 1 Chemical composition % of Gurbantunggut desert sand

The fly ash is Class I fly ash produced by Xinjiang Tianfu Thermal Power Industry and Trade Co., Ltd. The physical performance index test results are shown in Table 2.

Table 2 Physical properties of fly ash

The water reducing agent adopts HSC polycarboxylate high-performance water reducing agent produced by Qingdao Hongxia Additive Factory, and the water reducing rate is 20%. Both mixing water and curing water use tap water.

Example

Concrete was prepared according to the data shown in Table 3. The size of the test block was 150mm×150mm×150mm. The formwork was removed after 1 day of making the test block, and after curing for 7 days and 28 days respectively, according to GB/T50081-2002 "Test Method for Mechanical Properties of Ordinary Concrete" Standard "compressive strength test

Table 3 Concrete material mix ratio

The compressive strength test results of desert sand concrete 7d and 28d are shown in Table 4.

Table 4 test results

It can be seen from Table 4 that the average 28d compressive strength of desert sand concrete is 35.17MPa, and its workability is good, which can be widely used in actual construction projects.

After testing, when the mix ratio of desert sand concrete: water-binder ratio is 0.4, lime-sand ratio is 1/1, desert sand replacement rate is 20%, fly ash content is 15%; water reducing agent is 1.5%, at this time best concrete performance. (The water-cement ratio is the ratio of water/cement; the gray-sand ratio is the ratio of cement/(sand+desert sand); the replacement rate of desert sand is desert sand/(sand+desert sand); the amount of fly ash is fly ash /(fly ash+cement) ratio; superplasticizer dosage is the ratio of superplasticizer/(cement+water+sand+desert sand) ratio)

The above is only a preferred embodiment of the present invention, it should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present invention, some improvements and modifications can also be made, and these improvements and modifications should also be It is regarded as the protection scope of the present invention.

Claims (7)

1. Desert sand concrete is characterized in that it is prepared from the following raw materials: the water-cement ratio is 0.4, the lime-sand ratio is 1/2-1/1, the desert sand replacement rate is 15%-25%, and the powder Coal ash content is 10%-15%; water reducer is 1.0%-1.5%. 2. desert sand concrete according to claim 1, is characterized in that, described cement adopts Portland cement; Described sand adopts Xinjiang Manas River washed river sand, medium sand, fineness modulus MX=2.93, The bulk density is 1560kg/m ³ . 3 . The desert sand concrete according to claim 1 , wherein the stones are pebbles, the maximum particle size Dmax=25mm, and the bulk density is 2650kg/m ³ . 4. desert sand concrete according to claim 1, is characterized in that, described desert sand adopts Gurbantonggut desert sand, is the floating sand on the surface of 150 group fields in Junggar Basin, Xinjiang, and the average particle diameter is 0.183mm , Mx=0.334. 5. The desert sand concrete according to claim 1, characterized in that, the fineness of the fly ash is 6.0%, the loss _on ignition is 1.92%, the moisture content is 0.1%, the SO content is 0.2%, and the water demand ratio 92%. 6. The desert sand concrete according to claim 1, characterized in that, the water reducing agent adopts HSC polycarboxylate high-performance water reducing agent. 7. The desert sand concrete according to claim 1, characterized in that, the water-binder ratio is 0.4, the lime-sand ratio is 1/1, the desert sand replacement rate is 20%, and the fly ash content is 15%; 1.5%.