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machine-made sand, there are fewer studies on the effect of machine-made sand quality on the performance of concrete [35]. Therefore, further research is needed on the effect of quality variation of machine-made sand of different lithologies on performance. Therefore, in this study, the research on machine-made tuff sand concrete is carried
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, …
The key is to control the stone powder content in the machine-made sand. ... of machine-made sand to ensure that the machine-made sand can meet the requirements of high-grade concrete: (1) The ...
To enhance the application of machine-made sand (MMS) concrete in engineering, some performances of C30 ordinary concrete and MMS concrete are researched in this paper.
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 ...
2.4. Test results. Details of workability and unit weight of fresh MSC, and compressive strength of hardened MSC at 28 days are also presented in Table 1.Generally, when stone powder in manufactured sand was less than 13%, it had positive effects on the workability and compressive strength of MSC. 9% stone powder content was the best …
Note: the crushing value index is parameter crushing mount of the aggregate under a certain compressive load with a standard testing method; the Powder content is the content of particle under the 0.075 mm sieve; the Clay lump content of a …
The working performance and durability of medium and low strength machine-made sand concrete with different stone powder contents were studied, and the optimal range of stone powder content in ...
Therefore, stone powder in artificial sand cannot be regarded as a harmful substance. The comprehensive impact of stone powder content on artificial sand has been proved by decades of experiments: Guizhou Province began to study the use of artificial sand in the 1970s. When the stone powder content in artificial sand is 0-30%, it has little ...
In order to study the effect of polypropylene fibers on the frost resistance of natural sand and machine-made sand concrete, polypropylene fibers (PPF) of different volumes and lengths were mixed into natural sand and machine-made sand concrete, respectively. The freeze–thaw cycle test was carried out on polypropylene-fiber …
The current specifications for RAC in structural engineering primarily focus on the application of RAC prepared with RCA, with limited attention given to the use of recycled fine aggregate [9].The utilization of recycled fine aggregate is restricted due to its lower quality compared to river sand, resulting in decreased workability and mechanical …
To study the effect of stone powder content on the basic mechanical properties of mechanism sand concrete, the effect of stone powder content of 0%, 3%, 5%, 7%, 9%, 12%, and 15% on the cube ...
The invention provides a high-content stone powder full-machine-made sand C30-C55 concrete and a preparation method thereof. Wherein, in the high-doped stone powder full-machine-made sand C30-C55 concrete, each cube of the concrete contains the following raw materials by mass: 300-470 kg of cement, 45-70 kg of mountain flour, 850-950 kg of …
The proto-machine-made sand is a new artificial material for environmental protection with grain size smaller than 5 mm made of water cleaned crushed stones or gravels broken and separated by ...
Three strength grades of concrete C30, C40 and C50, and the contents of stone powder in machine-made sand of 5%, 9% and 13% in mass were considered in the mix proportion of concrete with machine ...
The paper introduces a series of test results of concrete in grade of C30 mixed with proto-machine-made sand. The contents of stone powder by mass of sand are 3 %, 7 % and 13 %, the cubic compressive strength were tested at ages of 3 d, 4 d, 7 d, 14 d, 28 d, 56 d, 90 d, 120 d, 150 d and 180 d.
Iron tailings powder (ITP) is a kind of solid waste, which pollutes the environment, without any treatment. The application of ITP in cement concrete is a good choice. In this study, the influence of ITP on the flowability, compressive strength, chloride ion permeability and the attenuation of the performance of cement concrete during …
Cement is manufactured from organic materials heated together at high temperatures to form a rock-like solid. Chunks are then ground into a fine powder. Site Search. A Sustainable Future Roadmap to Carbon Neutrality ... Cement & Concrete. An English bricklayer made the first portland cement early in the 19th century by burning powdered ...
Ready Mixed Concrete. Ready mixed refers to concrete that is batched for delivery from a central plant instead of being mixed on the jobsite. Each batch of ready mixed concrete is tailor-made according to the contractor's specifics and delivered to the site in a …
(5) The machine-made sand used in the experiment and its basic characteristics and mineral composition are shown in Tables 2-4 and 2-5: Table 2-4 Basic characteristics of machine-made sand
"Optimization and characterization of high-volume limestone powder in sustainable ultra-high performance concrete." Constr. Build. Mater. 242 (May): 118112.
manufactured sand, high silt content, and high powder content, which limits the application of manufactured sand in concrete [5] . A large number of studies have shown that poor gradation, high silt
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. …
2.2 Mix Proportioning and Casting. M25 grade SCC mix was prepared in this study, using 43 grade OPC, satisfying the requirements of EFNARC, 2005. The quantities of different materials in one cubic metre of SCC at water/binder ratio-0.44 were binder content-450 kg; sand-890 kg; coarse aggregate-750 kg; superplastisizer-6.75 kg.
Machine-made sand: self-produced high-quality machine-made sand was produced by the parent rock of Pingkan tun - nel excavation. The compressive strength of the parent …
Machine made sand is also called artificial sand, it is made of rock through a crusher, and a part of stone powder is inevitably produced during the production process, and the stone powder content of…
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.
Due to many different characteristics such as irregular polygon particle with pointed edges, rough surface and larger content of stone powder, machine-made sand has ignorable effects on the properties of concrete. As the basis for the design of concrete structures, the relations among the basic mechanical properties of concrete such as …
At the same slump, if a lower water consumption is used, it will inevitably lead to over-mixing of admixtures, resulting in high fluidity of machine-made sand concrete, but high viscosity and poor pumpability. Water is often added on the construction site to reduce viscosity. As a result, the quality of ready-mixed concrete cannot be guaranteed.
Electric flux test under different stone powder content. According to the analysis in Figure 1, the chloride ion impermeability of machine-made sand concrete with 10%~15% …
Manufactured sand concrete (MSC); stone powder content; experimental relations; mechanical parameters 1. Introduction The quantity needed for concrete aggregate has …
Machine-made sand: The granite lithologic machine-made sand produced by Shaanxi Dapu Construction Waste Resource Utilization Co., Ltd. is used, as shown in Fig. 2.The apparent density is 2721 kg/m 3, the bulk density is 1717 kg/m 3, and the content of particle size less than 0.075 is 3.7%, which is continuous.Gradation.
The versatility and strength of concrete have made it an indispensable ally in our quest to erect structures that not only reach towards the skies but also withstand the test of time. Definition of concrete. Concrete, a composite material, consists of cement, water, and aggregates like sand, gravel, or crushed stone.
Based on studying properties of materials for self-compacting concrete with machine-made sand, it analyzed current application of self-compacting concrete in China. Meanwhile, key issues in self-compacting concrete with sand-made sand, such as content of rock powder, principles of mixing proportion, quality of machine-made …
This study looked into the use of marble dust powder in concrete, with varied percentages of marble dust (0%, 5%, 10%, 15% & 20%) replaced by sharp sand in M20 grade concrete mixes, while the ...
proportion (kg/m3) was shown in Table 2. Machine-made sand was used to replace river sand with. 20%, 40%, 60%, 80%, and of sand mass respec tively. …
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 …