Nigeria is rich is solid mineral resources, such as: Kaolin, gypsum, mica, clay, tantalite, iron ore, gemstone, silica sand.
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Recycling concrete &building rubble is not only able to bring profit to investors, but also good for environment protection.
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By absorbing the advanced technology from the world, we researched and designed PF series impact crusher.…
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Base on the plentiful experience of producing and marketing of impact crusher, Sofol R&D institution…
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Adopting technology from the world, PY Series spring cone crusher has an excellent performance in secondary…
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The vibrating screen is a kind of sieving equipment of international advanced level, developed by our…
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Sofol VSI Series vertical shaft impact crusher is designed by reputed German expert of Sofol and every…
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Figure 5 shows the variation in water absorption of the RCA produced by the jaw crusher for all of the considered compositions. These results are concordant with the trend observed for the cement paste content. The larger the granular fraction, the lower the water absorption, which is logical given the lower cement paste content.
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Crushing waste concrete and using it directly as RAs has the disadvantages of high porosity and high water absorption. To achieve the reuse of resources, the researchers use microbial mineralization methods to further reinforce RAs. In this paper, the effect of the microbial carbonic anhydrase mineralization method on the water …
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Crushing of waste concrete has often used the rock crushing process, with traditional mechanical crushing using a jaw crusher, cone crusher, or impact crusher (vertical- or horizontal- shaft impact crusher). There are no specific crushing methods for recycling waste concrete. ... The water-absorption coefficient was determined using a …
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NA generally has low water absorption due to low porosity, but the adhered mortar on RCA has greater porosity which allows the aggregate to hold more water in its pores than NA. Shayan and Xu ( 2003 ) found water absorption values of 0.5–1 % for NA and 4–4.7 % for RCA in the saturated surface dry condition, up to a 4.2 % difference.
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1. SCOPE. 1.1 This standard covers the requirements for aggregates, crushed or. uncrushed, derived from natural sources, such as river terraces and river- beds, glacial deposits, rocks, boulders and gravels, for use in the Production of concrete for normal structural purposes including mass concrete works. 4.
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1.1 This standard lays down the procedure for determination of water absorption, apparent specific gravity, apparent porosity and true porosity of building stones used for …
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Water absorption of clay brick; Field Test: Rebound Hammer Test; Ultrasonic Pulse Velocity (UPV) Test; Windsor Probe Test; Concrete coring & compressive strength of concrete core; Rebar Scanning (Ferroscan) Aggregate & Crusher Run: Partical Size Distribution / Sieve analysis; Silt, dust & clay content; Los Angeles abrasion value; …
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The results of the water absorption test are shown in Fig. 7. The water absorption of basalt aggregates varies from 0.84% to 3.50%, with an average of 1.77%, (Table 2). All absorption values were found below 3.5% for aggregates. The water absorption values of basalt aggregates were found higher than limestone. Download : …
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STANDARD SPECIFICATIONS AND CODE OF PRACTICE FOR WATER BOUND MACADAM 1. INTRODUCTION 1.1. This standard was originally published in 1966. The first revision of the standard was approved by the Specifications and Standards Committee in their meeting held on the 29 th & 30 th September, 1972, by the Executive Committee …
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Water absorption of recycled concrete aggregate is the second important criteria for its quality assessment. ... For processing construction and demolition waste, the application of jaw crusher as primary crusher and impact crusher as secondary and tertiary crusher produce medium and low-quality recycled concrete aggregate. Its …
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The capacity of the crusher, reduction ratio, hardness, fragment size, moisture content, plasticity and abrasiveness of the material are important factors affecting the choice of the size reduction machines and methods for dealing with it. ... Other such indications are the proportion of expanding clay minerals and the water absorption ...
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Context 1. ... water absorption test results of hollow concrete blocks were taken at the age of 28 days of curing as shown in Fig. 5. Different results as described in Fig. 5, where the...
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The water absorption of crushed concrete aggregates (CCA) has a major influence on concrete workability. ... Aggregate fractions are replaced with concrete rubble crushed using a jaw crusher and sieved to CCA fractions of 8/11.2 mm and 0/8 mm. The grading curves for the natural aggregates and the CCA are assessed according to SS …
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This study examined the effects of various treatment methods by testing the aggregate impact value (AIV) and water absorption (WA) of recycled coarse aggregate before …
Detailslarge amount of water for ingredients to get closer packing. Fig. 1. Compaction factor of quarry dust concrete [6] Shaman and Srivastava [35] reported that the workability of concrete decreases rapidly with an increment of stone dust in concrete. At the higher (i.e., no slump) due to the more water absorption
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Pengujian water absorption mengacu pada standar NF EN 1097-6:2001 (European Standard). Hasil penelitian menunjukkan bahwa peningkatan ukuran butir maksimum dari dmax 2,0mm ke 4,75mm untuk material ...
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Let us make an in-depth study of the absorption of water in plants. After reading this article you will learn about 1. Mechanism of Absorption of Water 2.External Factors Affecting Absorption of Water 3.Relative Importance of Active and Passive Absorption of Water 4.Field Capacity or Water Holding Capacity of the Soil 5.Permanent Wilting …
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DetailsWater absorption decreases with increase in content of SCD and may replace river sand in conventional paver blocks. Porosity of the paver blocks decreases with increase …
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Water absorption capacity is one of the most important properties of aggregate. especially in case of RAC, which it has to be determined at earl y stages like in job mix. design stage [18]. It ...
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Water absorption development is measured at 0 min, 15 min, and 24 h. About 90% of the 24-h water absorption occurs in 15 min, value which is introduced. in the concrete recipe; slump flow and ...
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The coarse aggregates obtained by different crushing mechanisms (jaw and impact crushers) show very similar characteristics in terms of binder content assessed by acid leaching (27.5 and 26.6 wt.%), water absorption (8.76 and 9.75 wt.%) and porosity (18.6 and 20.2 vol.%).Thus, it is not possible to conclude that any of these mechanisms …
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The water absorption for the two series of concrete is shown in Table 5 and Fig. 2. It can be seen in the table that the water absorption, for both series, increases as the W/C ratio increases. The maximum absorption was observed at W/C ratio of 0.55. As the W/C ratio becomes larger than 0.55, water absorption decreases.
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This test helps to determine the water absorption of coarse aggregates as per IS: 2386 (Part III) – 1963. For this test a sample not less than 2000g should be used. The apparatus used for this test are :-. Wire basket – perforated, electroplated or plastic coated with wire hangers for suspending it from the balance, Water-tight container ...
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The pycnometer method is widely used to measure the water absorption of coarse and fine aggregates by immersing the aggregate fractions in water for 24 h according to SS-EN …
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main findings of the present study that, the Los Angeles index and water absorption of crushed aggregate is affected by the coarse recycled concrete aggregate dosage in its …
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Their water absorption is higher than 4.7 % ( Table 4 ) and it is, therefore, challenging to achieve good hardened properties of new concrete with such aggregates ( Mylonas, 2021 ).
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This study presents a liberation process for recycling high-quality coarse aggregates from waste concrete by impacting with steel grits. Considering the mortar liberation ratio and specific energy for the liberation process as well as the water absorption and apparent density of the recycled coarse aggregates (RCA), the effects …
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Choosing a vehicle (eg, water, applesauce, pudding) to deliver a crushed medication can affect its biochemistry and absorption . The care team must also decide how to administer multiple medications, while maintaining compliance with governmental or local regulatory guidance [12, 40]. Variation in each aspect of delivering a crushed …
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This test helps to determine the water absorption of coarse aggregates as per IS: 2386 (Part III) – 1963. For this test a sample not less than 2000g should be used. The …
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The low water absorption of coarse RCA can be obtained also by an ordinary jaw crusher if the input concrete is recycled from one source and it has higher strength than 70 MPa. (6) Based on selective demolition, energy consumption in recycling can be controlled because of known material input properties.
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PE series jaw crusher is usually used as primary crusher in quarry production lines, mineral ore crushing plants and powder making plants.
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