阅读说明：本技术 高性能机制砂混凝土及其机制砂的制备方法 (High-performance machine-made sand concrete and preparation method of machine-made sand thereof ) 是由 刘永红 王海峰 成义勇 辛学礼 于 2019-10-09 设计创作，主要内容包括：本发明公开了高性能机制砂混凝土,由以下组分组成：普通硅酸盐水泥200-350份、机制砂400-600份、石灰粉30-50份、粉煤灰115-125份、粗骨料1200-1500、水180-200份和减水剂4-6份；机制砂的制备方法具体步骤包括：选材；粗粉碎；细粉碎；制砂；洗砂；本发明采用机制砂代替天然砂制备混凝土,并且提供了机制砂的制备方法,选用建筑工地拆卸的混凝土块进行二次利用制成机制砂,节约能源,取材方便,降低了运输成本,提高了经济效益,混凝土块的利用率高,减少施工空间的占用；在混凝土的制备物料中添加了石灰粉,提高了混凝土的强度和耐水性,制备的混凝土性能高,适用性强。(The invention discloses high-performance machine-made sand concrete, which consists of the following components in percentage by weight: 350 parts of ordinary portland cement, 600 parts of machine-made sand, 30-50 parts of lime powder, 125 parts of fly ash, 1200 parts of coarse aggregate, 200 parts of water and 4-6 parts of a water reducing agent; the preparation method of the machine-made sand comprises the following specific steps: selecting materials; coarse grinding; fine grinding; preparing sand; washing sand; the invention adopts machine-made sand to replace natural sand to prepare concrete, and provides a preparation method of the machine-made sand, concrete blocks disassembled in a construction site are selected to be secondarily utilized to prepare the machine-made sand, so that energy is saved, materials are convenient to obtain, the transportation cost is reduced, the economic benefit is improved, the utilization rate of the concrete blocks is high, and the occupation of construction space is reduced; the lime powder is added into the concrete preparation materials, so that the strength and the water resistance of the concrete are improved, and the prepared concrete has high performance and strong applicability.)

1. High performance mechanism sand concrete, its characterized in that: the concrete consists of the following components: 350 parts of ordinary portland cement, 600 parts of machine-made sand, 30-50 parts of lime powder, 125 parts of fly ash 115, 1500 parts of coarse aggregate, 200 parts of water 180 and 4-6 parts of a water reducing agent.

2. The high performance machine-made sand concrete of claim 1, wherein: the lime powder is quicklime powder.

3. The high performance machine-made sand concrete of claim 1, wherein: the diameter of the coarse aggregate is 16-31.5 mm.

4. The high performance machine-made sand concrete of claim 1, wherein: the water reducing agent is a polycarboxylic acid water reducing agent.

5. The preparation method of the machine-made sand is characterized by comprising the following steps: the preparation method comprises the following specific steps:

1. selecting materials, namely selecting concrete blocks which are dismantled from buildings to ensure that the surfaces of the concrete blocks are free from dirt and do not contain other impurities;

2. coarse crushing: carrying out large-block crushing on the concrete blocks selected in the step 1 by a coarse crusher, and sieving by a primary sieve;

3. fine crushing: crushing the fine crushed blocks screened in the step 2 again by a fine crusher, and screening by a secondary screen;

4. sand making: making the fine materials screened in the step 3 into sand by a sand making machine, and carrying out three-stage screening;

5. sand washing: and (4) cleaning the fine powder screened out in the step (4) by a sand washer to prepare finished sand.

6. The method of making machine-made sand of claim 5, wherein: and 2, dividing the materials screened by the first-stage screening in the step 2 into fine crushed materials and fine powder, crushing the fine crushed materials again in the step 3, and feeding the fine powder into the step 4.

7. The method of making machine-made sand of claim 5, wherein: and 3, separating the materials screened by the secondary screening in the step 3 into fine powder and uncrushed fine fragments, circulating the uncrushed fine fragments through the step 3, and feeding the fine powder into the step 4.

8. The method of making machine-made sand of claim 5, wherein: and 4, separating materials screened out by the three-stage screening in the step 4 into coarse sand and powder, cleaning the coarse sand in the step 5 to prepare finished sand, and independently storing the powder as an additive for mixing concrete.

Technical Field

The invention relates to the technical field of machine-made sand, in particular to high-performance machine-made sand concrete and a preparation method of machine-made sand thereof.

Background

The machine-made sand is sand processed by a sand making machine and other accessory equipment, in recent years, with the rapid development of various construction projects in China, the investment of capital constructions of roads, railways and the like in various regions is increasingly increased, a large amount of sand is urgently needed, because of the increasing scarcity of natural sand resources and the serious damage of natural sand mining to the environment, the machine-made sand is rapidly developed, the performance of the traditional concrete is poor, specific auxiliary materials are required to be added in the concrete mixing to enhance the specific performance of the concrete, the concrete mixing machine cannot be suitable for various occasions, the applicability is poor, in the process of building construction, particularly old road reconstruction and old house removal, a large amount of concrete blocks can be generated, the concrete blocks are accumulated on a construction site, occupy construction space, are only used as a foundation after being crushed by a crusher and then are buried underground, and the utilization rate is low.

Disclosure of Invention

The invention mainly aims to provide high-performance machine-made sand concrete and a preparation method of machine-made sand thereof, which can effectively solve the problems of poor performance and poor applicability of the traditional concrete in the background technology; the waste concrete blocks occupy the construction space and have low utilization rate.

In order to achieve the purpose, the invention adopts the technical scheme that: the high-performance machine-made sand concrete consists of the following components: 350 parts of ordinary portland cement, 600 parts of machine-made sand, 30-50 parts of lime powder, 125 parts of fly ash 115, 1500 parts of coarse aggregate, 200 parts of water 180 and 4-6 parts of a water reducing agent.

Preferably, the lime powder is quicklime powder.

Preferably, the diameter of the coarse aggregate is 16-31.5 mm.

Preferably, the water reducing agent is a polycarboxylic acid water reducing agent.

The preparation method of the machine-made sand comprises the following specific steps: 1. selecting materials, namely selecting concrete blocks which are disassembled from buildings, ensuring that the surfaces of the concrete blocks are free of dirt and do not contain other impurities;

2. coarse crushing: carrying out large-block crushing on the concrete blocks selected in the step 1 by a coarse crusher, and sieving by a primary sieve;

3. fine crushing: crushing the fine crushed blocks screened in the step 2 again by a fine crusher, and screening by a secondary screen;

4. sand making: making the fine materials screened in the step 3 into sand by a sand making machine, and sieving by a three-stage sieve;

5. sand washing: and (4) cleaning the fine powder screened out in the step (4) by a sand washer to prepare finished sand.

Preferably, the materials screened by the first-stage screening in the step 2 are divided into fine lump materials and fine powder materials, the fine lump materials are crushed again in the step 3, and the fine powder materials enter the step 4.

Preferably, the material screened by the secondary screening in step 3 is divided into fine powder and uncrushed fine pieces, the uncrushed fine pieces are circulated through step 3, and the fine powder is introduced into step 4.

Preferably, the materials screened out by the three-stage screening in the step 4 are divided into coarse sand and powder, the coarse sand is cleaned in the step 5 to prepare finished sand, and the powder is independently stored as an additive for concrete mixing.

Compared with the prior art, the invention has the following beneficial effects: the invention adopts machine-made sand to replace natural sand to prepare concrete, and provides a preparation method of the machine-made sand, concrete blocks disassembled in a construction site are selected to be secondarily utilized to prepare the machine-made sand, so that the energy is saved, the materials are convenient to obtain, the transportation cost is reduced, the economic benefit is improved, the utilization rate of the concrete blocks is high, and the occupation of construction space is reduced; the lime powder is added into the preparation materials of the concrete, so that the strength and the water resistance of the concrete are improved, the pumpability of the concrete is enhanced, the creep of the concrete is reduced, the anti-permeability capability of the concrete is improved, the modification property of the concrete is increased, and the powder generated in the preparation process of the machine-made sand contains silicate cement which can be added into the mixture of the concrete again, so that the cementation property of the concrete is improved, and the prepared concrete has high performance and strong applicability.

Detailed Description

In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.