were used to investigate the performance of machine-made tuff sand concrete. The optimal concrete mix ratio of machine-made sand was obtained by orthogonal test and its working performance was ...
The carbonation test was carried out following the standard of Test Method for the Long-term Performance and Durability of Ordinary Concrete (GB/T 50082-2009) 22. For each kind of concrete, three ...
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 compressive strength, tensile strength, …
model of the concrete of machined sand containing stone dust. 2 Raw Materials and Test Schemes 2.1 Test Raw Materials 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 rock
The content of needle flakes in machine-made sand is most sensitive to the crushing index value. The crushing index value of machine-made sand is generally above 30%, or even higher. For mixing ordinary concrete, machine-made sand …
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 ... 50080-2016 "Standard for Performance Test Method of Ordinary Concrete Mix" to identify the point at which flow ceases, with the average expansion diameter serving as an indicator of ...
The innovations of this paper lie in three aspects: (1) RF models are trained based on the data of the selected concrete mixture indicators to obtain efficient and accurate concrete durability prediction models (2) A mapping function obtained through RF training is used as the surrogate model for iterative optimization calculations to reduce ...
The MSC cubes were tested by the splitting tensile method, the influences that the water-cement ratio and the stone powder content have on the tensile strength development of …
Semi-destructive concrete exposure methods were used to determine resistance parameters: the impact echo test to determine internal structure, the Figg test for air permeability, the initial ...
Several Misunderstandings Of Machine-made Sand To Prepare Concrete? - Oct 01, 2022-1 Characteristics of machine-made sand. According to GB/T 14684-2011 "Sand for Construction", artificial sand (artificial sand) does not include soft and weathered particles, but refers to the particle size not exceeding 4.75mm, which has undergone soil removal treatment, mechanical …
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 ...
The replacing products especially the machine-made sand successively occupied the sand markets [1]. However, as the design codes for concrete structures were made on the basis of ordinary concrete ...
concrete. The results point out the direction for the quality control of tunnel slag machine-made sand concrete. Keywords: machine-made sand; mortar; stone powder; tunnel slag; gray-correlation ...
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 ...
machine-made sand substitution rate showed the maximum compressive strength loss rate. Wang Weiwei et al. [4] studied the change law of mass loss and compressive strength of concrete with different iron tailings sand content after high temperature, and the results
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-made sand. The ordinary concrete with natural river sand in the same strength grade was tested at the same time for comparison.
Concrete; 7 Methods for Testing Concrete Strength. There are many different practices aside from cylinder break tests that can be used.
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 ...
are obvious differences between machine-made sand and natural river sand. So, there are some problems in the performance of concrete prepared with machine-made sand. At present, the machine-made sand is often mixed with natural river …
Ordinary Portland Cement (OPC) concrete is your go-to material for countless construction projects. It's made from cement, water, sand, and gravel, and it stands out for its strength, durability, and versatility. You'll find it in important …
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 ...
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 ...
This paper mainly studies the influence of various performance indexes of machine-made sand on the adaptability of polycarboxylic acid and the work performance of concrete, which …
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 compressive strength, tensile …
Rebound Hammer Test. The Rebound Hammer Test is a non-destructive testing method used to evaluate the surface hardness and compressive strength of concrete by measuring the rebound of a spring-loaded hammer. The test involves striking the surface of the concrete with the rebound hammer and measuring the rebound distance using the graduated …
O 2 t of Mu Us desert sand is r to that of ordinary . e [] d t a test of mortar d concrete made of Mu Us desert, d e s d that e Mu Us desert sand n be used as - g. In r to y e inLuence of desert sand on e mechanical properties of, e c compres-sion s on concrete made of desert sand were dout.TwogroupsofsdasM1dM6 were.rcomparison,eordinaryconcrete
The test objects made were tested for compressive strength. There were 6 test objects made in this study with a size of 15 cm x 30 cm. In detail, 3 test objects were made of pumice sand, while the other 3 test objects were made of ordinary sand. The coarse aggregate for all test objects was crushed stone.
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...
With the continuous development of nuclear technology, it is necessary to urgently solve the nuclear safety problem. γ-rays have a strong penetrating power. The γ-ray-shielding performance of ordinary concrete prepared with natural sand is weak and cannot meet the practical application of engineering. The γ-ray shielding performance of concrete can be …
Detailedly, the ordinary concrete is totally destroyed when impact velocity is 10 m/s, but the desert sand concrete still maintains the cone shape at impact velocity of 18 m/s, which indicates ...
This article presents 755 groups splitting tensile strength tests data of concrete with manufactured sand (MSC) in different curing age ranged from 1 day to 388 days related to the …
In order to investigate the influence of carbonation treatment on the rebound strength measurement curve of machine-made sand concrete, this study conducted research on the carbonation mechanism sand concrete rebound strength measurement curve through rebound and compressive strength tests using carbonation degree and concrete strength …
Machine-made sand self-compacting concrete is a kind of self compacting concrete with machine-made sand as fine aggregate, which could fill formwork only by its own gravity, without concrete vibration. ... This paper discusses the characteristics and construction differences between machine-made sand self-compacting concrete and ordinary ...
In this paper, the temperature field during the pouring process of machine-made sand concrete is numerically simulated, and the variation law of the temperature field with …