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Similarly, the formulation of high-performance concrete from machine-made sand is one of the concrete material sustainability studies [26,27]. Due to the wide distribution of limestone machine-made sand, a large number of studies focus on machine-made limestone sand [28–31], and less research on machine-made sand of other lithologies. River sand
Through continuous optimization of production process, machine-made sand meeting the needs of different levels can be produced to meet the development requirements of high-performance concrete. SMMVIK Machinery thinks that the first thing is to select materials, and the quality can only be controlled if the source materials meet the standards.
With the increasing number of construction projects in my country, the amount of concrete is increasing, and the demand for sand is also increasing. High-quality machine-made sand can meet the needs of different construction projects. So how to produce high-quality machine-made sand? It needs to start from the following six aspects: material selection, equipment, …
This paper recommends a method for calculating the modulus of elasticity applicable to machine-made sand concrete (or containing stone dust) and verifies its reliability.
It is a high-volume machine-made sand concrete, which is a mixture ... medium strength concrete, in order to meet the requirements of pumping construction ... stone powder content on machine-made ...
Test results showed that manufactured sand with no more than 13% stone powder content was beneficial to the long-term tensile strength of MSC. Forecast models are …
By changing the amount of stone powder in the machine-made sand, the ratio of cement to water and sand to grout, the change in the tensile value of the steel bar in concrete can be found. After a lot of test data to prove that the content of stone powder is 6%, the mortar ratio is 1: 2.5, the water-cement ratio is 0.40, the content of water ...
machine-made sand concrete in different environments, the effect of different stone powder content on machine-made sand concrete shrinkage, chloride ion permeability and crack …
2 Aggregate (1) The fine aggregate is a mixed sand made of machine made sand and iron tailing sand, among which machine-made sand is made locally in Jinan, with a fineness modulus of 3.1-3.3, a stone powder content of less than 10.0%, and a methylene blue test qualified ; The iron tailing sand is produced in Changqing area, Jinan, with a ...
linear relationship between the value of machine-made sand and the stone powder content. It can be seen from Table 2-5 that the selected machine-made sand has high calcium oxide content, all exceeding 40%, and the highest content is 51.43%. The silica content is the second, indicating that the machine-made sand is a calcium oxide rock.
Stone powder can fill the pores in the MSC, improve the overall grading of mechanism sand concrete, improve its working performance, and help to improve the mechanical strength of MSC. The optimum value of stone …
When the fineness modulus of machine-made sand concrete is greater than 2.7 and the stone powder content is less than 4%, the mechanical properties of machine-made sand concrete are better than those of river sand …
The chloride ion permeability coefficient of machine-made sand concrete at 28d are less than 182×10-14m2/s, showing that the C40 machine-made sand concrete has good resistance to chloride ion ...
One of the south-to-north water diversion project sections is on the remote location.In order to solve the problems of high price and environmental protection induced by natural river sand concrete,the performance of the coarse and fine aggregate,sand gradation,cement,additives and so on were tested.Different strength grade full machine-made concretes with different mix …
Sand and gravel aggregates account for 70% of the concrete volume and 80% of the mass. Doing a good job of concrete machine-made sand and gravel aggregate can not only meet the high-standard concrete production requirements, improve the quality and performance of concrete products, reduce the loss of concrete slump, and reduce the pumping pressure.
Based on appropriate assessment methods and indexes of self-compacting concrete proposed, properties of concrete made with river-sand and machine-made sand was firstly compared in different mix ...
Under the same water-binder ratios investigates full solid waste-based concrete composed of machine-made sand and a mixture of full solid waste-based concrete blended with 150 kg/m 3 of iron tailing sand and machine-made sand. And assess the workability properties of full solid waste-based concrete produced from waste rock with.
Download scientific diagram | C20 -C50 pumping concrete 50% machine-made sand substitution rate test ratio. from publication: Application Research of Gravel and Machine-Made Sand along the KKH-2 ...
It discusses the problems existing in the current machine-made sand industry, such as slow overall application, uneven quality and low application of high-grade concrete, and puts forward many ...
The paper mainly studies that Influence of stone powder content in machine-made sand on mortar concrete. By changing the amount of stone powder in the machine-made sand, the ratio of cement to ...
3. Powder content requirements. When ordinary limestone is used as raw material to produce machine-made sand below 2.36mm through an impact sand-making machine and vibrating screen, the content of stone powder produced is generally between 20 and 25%.
C60 manufactured sand concrete was prepared with different kinds of manufactured sand with different content of limestone powder. The influence of the types of manufactured sand (granite, sandstone, limestone pebble) and the content of limestone powder of granite manufactured sand (5%, 7%, 10%, 15%) on the creep of concrete at 150d were studied.
Only high-quality machine-made sand can prepare high-performance machine-made sand concrete. We will discuss how to produce high-quality machine-made sand in this post ... the parent rock's compressive strength ratio to the concrete's strength grade should not be less than 1.5. It is essential to control the mud content in raw materials ...
Natural sands are gradually depleted and manufactured sand concrete in engineering is becoming increasingly important. However, manufactured sands generally have the higher micro fines content, which limits wide applications of manufactured sands. This paper aims to study the effect on the Stone powder content on concrete workability, compressive …
Manufactured sand (MS) is a kind of artificial sand which is broken by rock crusher and has been applied in many projects. MS has the characteristics of particle morphology, stone powder content and parent rock, resulting in some differences in the performance of MS and NS concrete [7].Nanthagopalan et al. [8] successfully prepared self-compacting concrete …
powder into machine-made sand concrete to improve the overall performance of concrete. The machine-made sand contains stone powder with a particle size of less than 0.075 mm, which is one of the significant differences between machine-made sand and natural sand[4]. Stone powder is a by-product of machine-made sand. If it is not used, it will cause
The results indicate that the proportion of machine-made sand is 40% in C30 concrete, which makes the concrete show the best performance and the maximum compressive strength.
The effect of stone powder content in the machine-made sand on the workability of mortar and concrete is very significant. For now, the research on the machine-made sand concrete properties is still controversial. In addition, most studies are limited to limestone and granite machine-made sand, and there is little research on siltstone concrete ...
[0022] A machine-made sand C120 ultra-high-strength concrete that is easy to pump in super-high-rise buildings. The dosage ratio and performance of the concrete are as follows: [0023] [0024] [0025] The machine-made sand is basalt machine-made sand with a fineness modulus of 2.8, a bottom powder content of 4%, and an value of 0.8. The ...
Most of the mud particles are smaller than 0.016 mm, while most of the stone powder particles are between 0.0116 and 0.075 mm. Mud is adsorbed on the surface of sand and hinders the bonding between sand and cement; and a proper amount of stone powder can be filled in the gaps between cement and fine sand to enhance the workability of machine ...
machine-made sand cement concrete C50 reached the best when the machine-made sand cement content was 5%. Yang Lu [17] et al. conducted the study on the performance of machine-made sand
It can be seen from Table 2-4 that there is no obvious linear relationship between the value of machine-made sand and the stone powder content. It can be seen from Table 2-5 that the …
Manufactured sand crushed from stone or gravel, also known as machine-made sand, artificial sand or crushed-stone sand, has been used as a substitute of natural sand in concrete [1], [2], [3]. This is also becoming a global trend to produce concrete by using manufactured sand in the safeguarding of limited natural sand resources [4], [5], [6 ...
To study the efect of stone powder content on the basic mechanical properties of mechanism sand concrete, the efect of stone powder content of 0%, 3%, 5%, 7%, 9%, 12%, and 15% …
High mud content will reduce the workability and strength of concrete and increase the risk of shrinkage and cracking of concrete. Stone Powder Content: It refers to the content of particles smaller than 0.15mm in machine-made sand. An appropriate amount of stone powder can improve the fluidity of concrete, but excessive stone powder will ...