— The techniques such as optimization of basic parameters of concrete, admixture composition, large-volume mineral admixtures addition etc. for preparing machine-made sand self-compacting concrete ...
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 sand, construction …
— The mechanical and working properties of the machine-made sand concrete reach the optimum condition when the mineral admixture is 20%, the sand rate is 46%, the stone powder content is 10% and the water–cement ratio is 0.30. ... They are designed to meet specific performance requirements [7,8]. On the other hand, ...
— The addition of sand increases water consumption, and the initial setting time of machine-made sand concrete is 10-25 minutes longer than that of natural sand concrete. For the mixing of machine-made sand that meets the requirements of stone powder content into concrete, the hydration degree of cement in machine-made sand …
— Based on this, this paper calculates the life cycle of manufactured sand concrete, compares it with concrete configured with natural sand, establishes an …
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
— 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 concrete mix ratio are analyzed. These factors to be optimized are used. Materials 2022, 15, 3516 3 of 18 ... which meets the requirements of Chinese national standards. The fine aggregates are selected from machine-made tuff sand (number NH),
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 …
concrete Select machine-made sand with different stone powder content, adjust the concrete sand ratio to make the initial state of concrete similar, and determine the influence of machine-made sand powder content on the amount of water reducing agent, concrete loss over time and strength change. The test results are shown in Table 3-3,
— As the industrial waste from blast furnace ironmaking, air-cooled blast furnace slag (ACBFS) puts a lot of pressure on the environment. It is becoming more and more urgent to deal with the increasing ACBFS. In this study, the concept of "full-volume slag alkali-activated mortars (FSAM)" is proposed using ground granulated water-cooled …
— Concrete hollow blocks offer a cost-effective, durable, and versatile construction material that has become increasingly popular in recent years. Thanks to their lightweight design and uniform properties, concrete hollow blocks are an ideal choice for residential, commercial, and industrial building projects. They boast high compressive …
— 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 …
— 04. Requirements for manufactured sand. The particle size of manufactured sand is between 4.75-0.15mm, and there is a certain proportion limit for stone powder less than 0.075mm.
— 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.
machine-made sand concrete was better than that of concrete with natural sand. This is ... The test determined that the tunnel slag meets the strength requirements of C40 and below concrete for ...
— 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 …
Workability properties of concrete with river sand and machine-made sand were investigated. According to the results shown in Table 3 and observa-tions during test, …
used. Large production machines may require a minimum slab thickness of 150mm. Concrete: For concrete ordered from a readymix supplier such as AfriSam, specify a strength of 30MPa at 28 days and 19mm stone. Slump should be 100mm if the concrete is to be compacted by machine vibration and 125mm for hand compaction. A wood-floated
— The test determined that the tunnel slag meets the strength requirements of C40 and below concrete for parent rock. Three types of parent materials were selected and sent to the testing center of the Geological Engineering Survey Institute for rock and mineral identification. ... Machine-made sand concrete with different fineness modulus and ...
Does the machine-made sand used to make concrete meet the requirements? October.04,2020. It is possible to consciously choose hard rock to produce machine-made sand, avoid soft and weathered rocks, and at the same time, the amount of mud (lumps) can be manually screened and controlled.
— Concrete with manufactured sand (MSC) is a potential environmental friendly building material. As the limited study on tensile strength development of MSC, the findings of research work are presented in this paper.
machine-made sand is finer, but the surface roughness affects the workability of concrete products [8-9]. ... Then, mix the concrete according to the mixture ratio and requirements of concrete in table 3, and test the main technical properties of each concrete, such as flowability, cohesiveness, water retentiveness
— The finished product of machine-made sand is more regular and can be processed into different sizes of sand, which can better meet the needs of construction sand. The artificial sand is of uniform and stable material, and the sand is clean, free of mud and other harmful impurities, has stable performance and good particle size The …
improve the engineering quality of the machine-made sand concrete. 1 Introduction In recent years, with the Chinese government investing ... requirements of the parent rock. After treatment, it is mechanically broken, screened and shaped to make the particle size less than 4.75mm. At the same time, its
— Aggregate micro fines (AMF) were usually included in the machine-made sand during the stone breaking process. Different AMF contents could be included in different batchs of machine-made sand, and thus causing different concrete properties, like the volume stability. In order to explore the influence of AMF contents in machine-made …
— The properties of machine-made mortar with different stone powder content were analyzed through experiments. By analyzing the performance of machine-made sand concrete with equal amounts of …
— With the rapid development of concrete technology, high-performance concrete has higher requirements for the quality of aggregates. It requires stable quality, gradation, and good shape, while less and less natural sand meets the requirements. ... Machine-made sand has unlimited development space and broad investment prospects, …
— 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 ...
— 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 mechanical and working properties of the machine-made sand concrete reach the optimum condition when the mineral admixture is 20%, the sand rate is 46%, the stone powder content is 10% and the ...
— 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 2.Both AMF and MS were made from limestone. The XRD pattern of AMF was shown in Fig. 1, and the specific surface area was 353 m 2 /kg. MS had a fineness modulus of …
— 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 ...
Basic Mechanical Properties of Concrete with Machine-Made Sand and Recycled Coarse Aggregate p.1102
sand with energy saving materials, machine-made sand and superfine Yangtze River sand. Based on the determination of two kinds of sand, an experimental research scheme is …
