About Us

MINEVIK Machinery is a leading and pioneering enterprise with the most advanced international level in R&D, manufacturing and selling of large-scale crushing & screening plants and beneficiation plants.

large-scale crushing & screening plants and beneficiation plants.

All of our equipment have got ISO international quality system certification, European Union CE certification and Russian GOST certification.

  • In central China-Zhengzhou, covering 140 thousand square meters
  • Win-win cooperation and create more value to customers
  • Exported large quantities and high-end mobile crushing plant and milling equipments to Russia, Kazakhstan, Indonesia, Ecuador, South Africa, Nigeria, Turkey more than 100 countries .

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Our Products

AS a leading global manufacturer of crushing and milling equipment, we offer including quarry, aggregate, grinding production and complete stone crushing plant. We also supply individual crushers and mills as well as spare parts of them.

Services

Our goal is to guarantee the excellent operation equipment with high safety for our customers and minimize the downtime of the machine by predictive maintenance. Kefid service and original accessories can be 100% trusted at the time of maintenance.

SERVICE AND SUPPORT

Minevik service and original accessories can be 100% trusted at the time of maintenance.

ACCESSORIES CENTER

striving to enable customers to get the parts in the nearest place.

SALES MARKET

Our sales market is spread all over more than 100 countries and regions

recycled aggregate higher water absorption

Recycled Aggregate an overview | ScienceDirect Topics

As the recycled aggregates present have a higher water absorption capacity, a higher content of fine materials, and a rougher surface (larger surface area), the water content of the mixture needs to be modified in order to obtain matrices with the same consistencies of those determined when using natural aggregates 78,79.

Water Absorption Study in Recycled Aggregates for Use as

because of its high water absorption rate [4]. Investigations were carried out on 11 RA samples obtained from 10 demolition sites and a recycling plant. The study revealed that in most samples, the water absorption of 10 mm aggregates was higher than 20 mm aggregates. It was inferred that smaller size aggregates had more cement

Recycled Concrete Aggregate an overview | ScienceDirect

However, the use of fine RCA below 2 mm is uncommon in recycled aggregate concrete because of the high water demand of the fine material smaller than 150 μm, which lowers the strength and increases the concrete shrinkage significantly. This high water absorption and high cohesion of fine RCA also makes concrete quality control very difficult.

Crushed Concrete Aggregates – Properties and Uses of

Water absorption of recycled aggregate influence both fresh and hardened concrete properties. Recycled sand will be avoided, due to its absorption capacity, which would no doubt produce a shrinkage effect. Workability of recycled aggregate concretes is affected by the absorption capacity of the recycled aggregates.

Water absorption variability of recycled concrete aggregates

One important difference between CRCA and natural aggregates is water absorption. The high water absorption of CRCA is linked to the presence of old mortar (de Juan and Gutierrez, 2009). Dry recycled aggregates behave like sponges in fresh concrete, thus impacting on the water

A paper submitted to Griffith University

The higher water absorption of the coarse aggregate resulted from the higher absorption rate of cement mortar attached to the aggregate particles [22-24]. This characterizes concrete made with higher water absorption recycled aggregate reduced compressive strength and resistance to freezing and thawing than with ordinary aggregate [23

Water absorption variability of recycled concrete

With this criterion, aggregates with bulk specific density higher than 2160 kg/m3, water absorption lower than 8% and Los Angeles abrasion loss under 40%, are obtained.•The results can also be

Experimental Study on the Influence of Water Absorption

4/04/2015· In this paper, three recycled coarse aggregates (RCAs) with different 24-h water absorptions (5.67, 3.12, and 1.98 wt%) were used to produce recycled coarse aggregate concretes (RCACs). Different water absorption rates were obtained by modifying the surface of RCAs with low and high concentration of alkaline organosilicone modifier that is

Recycled Concrete Aggregates: A Review | International

29/03/2013· Yang et al. attributed a reduction in compressive strength for RCA concrete to the increased water absorption of the aggregate and found that at relatively low water absorption (relatively low RCA fraction) concrete had equivalent compressive strengths while higher RCA fractions and absorption compressive strengths were 60–80 % of that of

Use of RECYCLED AGGREGATES In CONCRETE- A

The use of recycled aggregates in concrete prove to be a valuable building materials in technical, environment and economical respect Recycled aggregate posses relatively lower bulk density, crushing and impact values and higher water absorption as compared to natural aggregate. The compressive strength of recycled aggregate concrete is

Effects of Recycled Aggregate on Concrete Mix and

Concrete mix with 30% recycled aggregate had the lowest chloride penetration after 2 weeks of saturation and performed better than a concrete mix with 100% natural aggregate. Owing to the lower density and higher water absorption of recycled aggregates, chloride ion diffusion increased with increasing recycled aggregate content beyond 2 weeks.

Cement paste content and water absorption of recycled

Some studies con- cluded that water absorption of recycled coarse aggregate can vary in the range of 3-12%, which is compatible with the present study reporting an increase of 9% in water

Study of recycled concrete aggregate quality and its

density and absorption. Moreover, the study analyses how the recycled aggregate (both percentage and quality) and the mixing procedure (pre-soaking or adding extra water) influence the recycled concrete strength of dif-ferent categories (high or low water to cement ratios). When recycled aggregate absorption is low (under 5%),

Recycled Concrete as Aggregate for Structural Concrete

aggregate. Because of the attached mortar, recycled aggregate has significantly higher water absorption than natural aggregate. Therefore, to obtain the desired workability of RAC it is necessary to add a certain amount of water to saturate recycled aggregate before or during mixing, if no

Nanosilica Improves Recycled Concrete Aggregates

relatively higher water absorption. Compressive strength of untreated recycled aggregate concrete can be lower by about 15% compared to original concrete. Properties of Recycled Concrete Aggregates and concrete made with them are enhanced by addition of appropriate nano-materials such as

Influence of Water Absorption of the Ceramic Aggregate

The Present paper investigates the influence of water absorption of ceramic waste aggregate on strength properties of ceramic aggregate concrete. Compressive strength and split tensile strength of concrete made with ceramic waste aggregate is studied with replacement of natural coarse aggregate by ceramic waste aggregate at 0%, 20%, 40%, 60%

Removal of Cement Mortar Remains from Recycled Aggregate

RA is the large amount of cement mortar remains on the surface of the aggregate, resulting in higher porosity, water absorption rates and thus a weaker interfacial zone between new cement mortar and aggregates, which weakens the strength and mechanical performance of concrete made from RA. This paper attempts to study three pre-soaking

IMPLICATIONS OF USING RECYCLED CONSTRUCTION

The recycled aggregate have higher content of fine materials, and water absorption. Consequently they require much lower water to cement ratio (W/C) than natural aggregates in order to achieve comparable concrete strength class. However, less W/C reduction is required when fly ash is added to concrete mixture, because of its pozzolanic activity. Anyway in the presence of recycled aggregate, a

Estimation of Water Absorption Capacity of Hardened

Recycled construction and demolition waste, especially recycled concrete, is able to use as an aggregate for concrete. The high water absorption capacity (WA) of recycled aggregate has a negative impact of concrete mix workability and influences the water-cement ratio. This paper presents results of experimental measurement of WA of recycled aggregate and recycled concrete.

Recycling | Free Full-Text | Strength Development and

Recycled roof tile aggregate has higher water absorption, crushing values and abrasion values than the normal aggregate but exhibits lower specific gravity and bulk density, as shown in Table 2. Aggregates with such characteristic are generally referred to as low-quality aggregates due to the inferiority of such properties to normal concrete

High quality recycled aggregate kayasand

=High quality recycled aggregate production system= ・Higher water absorption ・Higher density ・Lower water absorption 5 Lowe quality Fickleness Higher quality Stability. Cement paste Density Non processed recycled coarse aggregate (Nitric acid with 25% of concentration was used for dissolving cement paste) ・Un removed cement paste varies from 25% up to 54%. ・The more cement paste

Effect of Recycled Coarse Aggregate on Concrete

This is due to the migration of water absorbed by the aggregate to the paste around particles of aggregates, then, the water absorption will influence volume of water and pores in the paste. Recycled fine aggregate has high water absorption because it contain a large quantity of hydrated cement paste from the demolished concrete. Increasing the

EFFECTS OF RECYCLED CONCRETE AGGREGATES ON PROPERTIES

aggregates due to the cement paste attached to the surface of the original natural aggregates after the process of recycling. This highly porous cement paste and other contaminations contribute to the lower particle density and higher porosity, variation in the quality of the RCA and the higher water absorption. This paper presents some of the

Mix Design and Properties of Recycled Aggregate

26/08/2014· It can be noticed in Table 2 that recycled aggregates have a significant higher water absorption capacity and a lower density than natural ones. In spite of the high water absorption capacity of the used RCA, it remains within the range recommended by the design standards (McNeil and Kang 2013; Kang et al. 2014).

Prediction Adequacy of Creep of Recycled Concrete

A recycled concrete aggregate (RCA) has much higher water absorption content compared to a natural aggregate and could significantly influence the creep properties and durability of concrete. This article investigates the influence of RCA and its water absorption content on the creep properties of concrete and develops a model to predict the

Characterization of Recycled Coarse Aggregate (RCA) via

20/05/2014· Recycled coarse aggregate (RCA) made from waste concrete is not a suitable structural material as it has high absorption of cement mortar, which adheres on the aggregate surface and on the tiny cracks thereon. Therefore, when using RCA made from waste concrete, much water must be added with the concrete, and slump loss occurs when transporting

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