Mud Content: It refers to the content of particles smaller than 0.075mm in machine-made sand. 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.
The most obvious difference between the machine-made sand and natural sand is that the machine-made sand will produce stone powder with particle size less than 0.075 mm. The limit value of stone …
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, 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 ... apparent density of 2.63 g/cm3 and bulk density of 1.52 g/cm3. The gradation curve of fine aggregate is shown in Figure 1. Table 1. Fine aggregate index properties ...
to solve the problem of insufficient supply of nat ural sand, ... Stack density kg/m3 ≥ ... Application technology and cost of machine-made sand[J].Journal of Highwa y transportation science and ...
LZZG sand washing machines include wheel, screw sand washer, sand washing and recovery equipment, the capacity is 20~350m³/h, small footprint. ... The product has the advantages of high compressive …
Type I ordinary Portland cement was used with a specific surface area of 362 m 2 /kg, the properties and oxide compositions of cement were shown in Table 1, Table …
By replacing the machine-made sand in different proportions, the work performance and compressive strength of concrete are studied. ... Crush Value /% Bulk Density /( kg/m 3) Fineness Modulus Mud ...
Since the stone powder content of machine-made sand is 5%, A1 is directly prepared by machine-made sand. The other three groups are prepared by sieving 8%, 11% Stone powder content of machine-made sand. A5 is ordinary river sand. The fineness modulus of river sand is 2.7, which is the same as that of machine-made …
However, to compete with natural sand, artificial sand must be added with a special blending agent. 1 Stone powder has been officially used as an important additive for machine-made sand due to its easy availability, low price, and excellent performance. Stone powder with small particle size and high density can penetrate the voids of …
machine-made sand concrete mix ratio are analyzed. These factors to be optimized are used. Materials 2022, 15, 3516 3 of 18 ... apparent density of 2.63 g/cm3 and bulk density of 1.52 g/cm3. The gradation curve of fine aggregate is shown in Figure1. Table 1. Fine aggregate index properties. Type Fineness Modulus Apparent Density/(g/cm 3)
In many countries, natural sand sources are becoming insufficient and environmental ... sand (MS) is popular as machine-made sand, ... Average bulk density value of river sand and
stone powder content (mass fract ion) is between 10% and 15%. In this range, the chloride ion permeability. of machine-made sand concrete decreases with the …
Influence of machine-made sand quality on concrete performance.[D] Social Sciences Edition,2016. Research on performance of artificial sand with different fineness modulus applied to concrete J Huang
Machine-made sand is gradually replacing natural sand to achieve sustainable development. Experimental studies and gray-correlation analysis were used to study the properties of tunnel slag machine-made mortar and concrete. ... The surface bulk density of mixed coarse aggregate was 1456 kg/m 3, and the crushing value was …
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With the depletion and increasing demand of river sand, machine-made sand could be used more and more in concrete. In order to improve the properties of machine-made sand concrete, the effects of the aggregate micro fines (AMF) content, aluminum sulfate, and polypropylene fibers (PPF) on the slump, compressive strength, …
In some aspects, concrete made with manufactured sand even outperforms that made with natural sand. However, it may also exhibit inferior properties such as brittleness, which is closely related to rock lithology and crushing processes [9,10,11,12]. The addition of various mineral admixtures has effectively improved the workability of concrete ...
The best mix proportion of solid waste-based super-retarded damp-shotcrete is as follows: cement: fly ash: machine-made stone: machine-made sand: earth-rock waste = 1: 0.25: 1.09: 0.44: 1.33. ... insufficient construction personnel, and poor working environment (Chen et ... and the charge density of anions increases, which increases …
The natural sand supply is limited under the environmental regulations. ... and the permeability of concrete decreased because the relative density of quarry stone powder is better than that of CC. ... and …
The usage of manufactured sand concrete is widespread in modern engineering, and it is important to study its performance to improve the overall engineering quality. This paper presents an experimental study on the working performance and durability of 12 groups of manufactured sand high-performance concrete (MSHPC) with …
At present, most of the machine-made sand is used as a last resort when the supply of natural sand is insufficient or because of the economic disparity. Comparison of artificial sand sand and natural sand. 1. Robustness and durability The firmness of machine-made sand is slightly worse than that of river sand, but it still reaches the …
A optimum prediction model of chloride ion diffusion coefficient of machine-made sand concrete based on different machine learning methods. Author links open overlay panel Wei Zheng a, Jiqi Cai b. Show more. Add to Mendeley. ... The scatter plot of the feature density obtained using the SHAP approach is shown in Fig. 8. From the Fig. …
Machine-made sand instead of natural sand has become an inevitable choice for the sustainable development of the concrete industry. Orthogonal experiment and grey correlation analysis were used to investigate the performance of machine-made tuff sand concrete. The optimal concrete mix ratio of machine-made sand was obtained by …
When a footing fails due to insufficient bearing capacity, distinct failure patterns are developed depending upon _____ a) Failure mechanism ... Punching shear may occur in loose sand with density less than _____ a) 45 % b) 50 % c) 35 % d) 20 % ... Machine Foundations. Mass Spring System Barkens Method Block Foundation.
With the lack of natural sand and stone resources, machine-made sand will be widely used in the building materials industry. By adjusting the proportion of machine-made sand and river sand, the ...
Its low content in iron oxides gives it an insufficient density ($2.8 g/cm 3 (Rodriguez ... By analyzing the performance of machine-made sand concrete with equal amounts of cement replaced by ...
However, the machine-made sand produced by the general sand field is slightly insufficient at 0.315mm, and at the same time more than 1.18mm, which brings certain difficulties to the preparation of pumped machine-made sand concrete.
The chloride ion diffusion coefficient (CIDC) is an important index to evaluate the durability performance of machined sand concrete. In this study, a database of CIDC is established for 82 sets of experimental data for 4 influence parameters. Meanwhile, different models with 4 input variables (Water to binder ratio, fly ash ratio, relative humidity and …
In many countries, natural sand sources are becoming insufficient and environmental ... sand (MS) is popular as machine-made sand, ... MS displays higher bulk density than …
2.1. Raw Materials. The cement used was Ningxia Saima Factory P.O42.5 ordinary Portland cement, and the fine aggregate was natural river sand with a fineness modulus of 2.76, water absorption of 2.67%, and bulk density and apparent density of 1490 kg/m 3 and 2660 kg/m 3, respectively.The size distribution of natural river sand is …
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% stone …
machine-made sand in the 1980s. An example of the application of machine-made sand in my country is the construction of the Three Gorges Dam. It is a high-volume machine-made sand concrete, which is a mixture of machine-made sand, fly ash, silica fume, etc[5]. and natural sand, but no stone powder is added. In view of
SiO 2 and Al 2 O 3 are mainly chemical compositions of AS with finer particle sizes compared to river sand or machine-made sand [9,10]. Based on this, several studies have extensively investigated the feasibility of AS fine aggregate. Much research demonstrated that the incorporation of AS can improve the mechanical strength and …
The optimal working performance of the machine-made sand concrete was achieved at the mineral admixture of 20%, sand rate of 46%, stone powder content of …
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 …
