Manufactured sand (MS) refers to rock particles (excluding soft and weathered particles) with a particle size of less than 4.75 mm, which can be obtained by mechanical crushing and screening after soil removal treatment. Compared with natural sand, MS has...

The optimum content of stone powder in machine-made sand is 9% in this study of concretes in strength grades of C30, C40 and C50. The reasonable content of water-reducer …

The loose bulk density and apparent density of machine-made tuff sand are close to that of river sand, but smaller than that of machine-made limestone sand. The fineness modulus of all batches of fine aggregates …

Properties of Self-Compacting Concrete with Machine-Made Sand and High-Volume Mineral Admixtures Zhengwu Jiang1,*, Shilong Mei 2 ... mum size of 25 mm, apparent density of 2.64g/cm3, bulk density of 1.52g/cm3, crushing index of 11.4% and soil con-tent of 0.8% was used. To realize best aggregate gradation

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 ...

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. 8, it can ...

2.1 Raw materials. Ordinary Portland cement grade 42.5 (conforming to Chinese national standard GB175-2007) [] was used.The physical properties and chemical compositions of cement are listed in Tables 1 and 2, respectively.Coarse aggregates are limestone with a continuous grading of 4.75–26.5 mm. Fine aggregates are limestone machine-made sand …

This paper introduces a theory-guided machine learning (TGML) framework, which combines a theoretical model (TM) and a machine learning (ML) algorithm to predict compaction density under cyclic loading. Several 1-D tests were conducted on uniformly graded fine sand compacted at varying moisture contents $$left( w right)$$ w, stress levels $$left( …

As many differences of machine-made sand from natural sand in particle shape, surface characteristics and particle size distribution (i.e. grading), especially in larger content of stone powder ...

2.1 Test Raw Materials. Machine-made sand: self-produced high-quality machine-made sand was produced by the parent rock of Pingkan tunnel excavation. The compressive strength of the parent rock was 102 MPa, the apparent density was 2723 kg/m 3, and the moisture content was 0.6%.The crushing index of machine-made sand was 18%, the …

The MC0 as the control mixture, and the water/binder ratio and sand ratio are 0.4 and 45%, respectively. The content of TSP form tunnel slag is set as a variable, and equal mass replaces machine-made sand form tunnel slag. The content of TSP in machine-made sand are 0%, 4%, 8%, and 12%, respectively.

of sand-nes mixtures compared to the global void ratio and relative density. A comparison of the behavior of clean and silty sand with a constant ψ (= − 0.03) conrms that the sample with 10%

Lesser impurities and good working properties: Manufactured sand is free of silt and clay particles, and has denser particle packing than natural sand. It also offers higher …

The increase in flake particle content leads to greater elongation of machined sand. • High flaky particle content can lead to poor flowability of mortar. • There is a correlation …

The usual compaction tests are the standard Proctor [15] or the modified Proctor [16]; both consist of a very similar procedure, but varying the energy applied: 583 kNm/m 3 and 2632 kNm/m 3 (4.5 ...

In lean concrete and mortar mixtures with insufficient cement particles to meet workability requirements, the addition of these inert fine particles from artificial sand helps …

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 ...

The sand was sieved using a 4 mm wire mesh at the Durban University of Technology Projects Laboratory. This river sand is regarded as the most suitable material that is made use of in the building industry for the manufacturing of bricks and blocks. 2.3 Kaolin Clay as a …

The loose bulk density and apparent density of machine-made tuff sand are close to that of river sand, but smaller than that of machine-made limestone sand. The fineness modulus of all batches of fine aggregates ranged from 2.6 to 3.0, which was in the range of medium sands. Roughness is a measure of the fluidity and angularity of fine aggregates.

Mechanical Properties and Micromorphology of Calcium Oxide Expansion Agent on River Sand/Machine-Made Sand Concrete April 2022 Advances in Civil Engineering 2022(3):1-17

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. ... insufficient mechanical strength, ... Mix design and characteristics evaluation of high-performance ...

of Machine-Made Sand Concrete Hang He 1, ... of 5 to 25 mm with an apparent density of 2721 kg/m3, bulk density of 1562 kg/m3, void ratio of 42.6%, and a crushing value of 7.5%. The main ...

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 ...

In many countries, natural sand sources are becoming insufficient and environmental authorities prevents sand dredging (Kaya, 2009, Manning and Vetterlein, 2004). Manufactured sand (MS) is...

machine-made sand, there are fewer studies on the effect of machine-made sand quality ... and bulk density of 1.52 g/cm3. The gradation curve of fine aggregate is shown in Figure1.

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 ...

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 was 102 …

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

Abstract: This paper studied the influence of various performance indexes of machine-made sand on concrete work performance and admixture adaptability. The experimental results show: The …

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 ...