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This study presents results on the influence of specific gravity of coarse aggregate on the interfacial transition zone, permeability, and strength of concrete. The aggregate variables studied in this work were specific density (0·85, 1·20, 1·80, 2·65) and water / …


Test results indicate that the workability of ceramic waste coarse aggregate concrete is good and the strength characteristics are comparable to those of the conventional concrete. View Show abstract


AggregatesAggregates • Aggregates generally occupy 65- 80% of a concrete'sAggregates generally occupy 65- 80% of a concrete's volume.volume. Aggregates are inert fillers floating in theAggregates are inert fillers floating in the cement paste matrix for concretes of low strength. Thecement paste matrix for concretes of low strength.


The variables in the test program are replacement rate (0%, 30%, 60%, and ) of recycled aggregate and shear span-to-depth ratio (2.0, 2.5, 3.0, 4.0, and 5.0). This work compares the experimental results with results obtained using current code equations found in American Concrete Institute (ACI) 318 (2014) and equations proposed in the ...


This paper studied the effect of aggregate properties on the crushing strength of concrete. In order to achieve the study objective, three types of coarse aggregates, brick khoa, shingles stone, and black stone were used to test. And the test results show that concrete made from black stone has the highest workability followed by shingles stone & brick khoa of aggregates.


equivalent volume of the percentage of the coarse aggregate to be replaced. For coarse aggregate replacement by coconut shell, the percentage replacement was 25% while for waste rubber tyre, the coarse aggregate replacement was 10%. Concrete beams for the Shear Strength tests were cast in wooden moulds shown in Figure 2. Figure 2.


The strength of concrete mix is dependent on many parameters like cement type, coarse aggregate and the interface between aggregate and mortar. However, generally the coarse aggregate is treated as an inert material and only its physical properties like shape, size, water absorption and specific gravity are studied.


as coarse aggregate gave values nearer to that of conventional aggregate concrete. Similarly, the ceramic aggregate concrete gave the next higher strength. Fig 3. Split tensile test 4.3 Flexural strength The flexural strength results were found in the range of 8.699 MPa to 10.368 MPa for 7 days and it is from 13.945 MPa to 18.015 MPa for 28 days.


Performance of Recycled Asphalt Pavement as Coarse Aggregate in Concrete Fidelis O. OKAFOR 52 Figure 1.b. Water/cement ratio 0.60 Figure 1.c. Water/cement ratio 0.70 Figure 1. Relationship between compressive strength and age (mix 1:2:4) A closer examination of Figure 1 reveals that the strength of RAP concrete remained


As the percentage of crushed concrete coarse aggregates and crushed brick fine aggregates is increased, Coarse aggregate is replacement level of 25% & 50 % brick waste in concrete mixes was found to be the level to obtain higher value of the strength and durability at the age of 28 days. 25% & 50 % concrete waste in concrete mixes was found ...


While we talk about the strength of coarse aggregates it refers to the crushing strength of the aggregate itself. However, the required information on strength of coarse aggregates can be obtained from indirect tests: crushing strength of prepared rock samples, crushed value of bulk aggregate, and performance of aggregate in concrete.


ABSTRACT: This paper describes two laboratory based experimental studies to determine some plastic and hardened properties of concrete incorporating recycled concrete aggregates. One study examines the effects that the cleanliness of recycled coarse aggregate particles has on the concrete properties, where cleanliness relates to the amount of ...


Fine and Coarse Aggregates . Local mining sand was used as the fine aggregate, having a specific gravity, fineness modulus, water absorption, and maximum grain size of 2.68 g/m 3, 2.72, 0.97%, and 4.75 mm, respectively. The fine aggregate content was kept constant at 860 kg/m 3 for all mixes. OPS were used as the coarse aggregate in this study.


Basalt Aggregate as Coarse Aggregate in High Strength Concrete Mixes P.RAMTEJA P.G Student Siddartha Group Of Educational Acadamy Tirupati. Abstract: Concrete innovation has been changing quickly and continually since its revelation. The way toward selecting appropriate elements of concrete and deciding their relative sums with the goal of ...


Answer (1 of 2): Aggregate mixture ratios determine the properties of the cured concrete. Too much course or fine aggregate in the admixture will have detrimental effects on the strength of the cured concrete. The proper proportions and sizing will often include up to four different size ranges o...


recycled coarse aggregates from waste concrete can deal with these limits. 2.2. Adhered mortar The main differences between recycled concrete . aggregate and natural aggregate are due to the pres - ence of adhered cement mortar (110). This new material makes the aggregate density lower and the water absorption and Los Angeles coefficient


The volume fraction of coarse aggregate has a limited influence on the uniaxial compressive strength [24, 25], so the uniaxial compressive strength of concrete is approximately taken as the ...


Coarse aggregates containing more than approximately 20% of the particles having ratios of length to circumscribed thickness greater than three to one, as determined by ASTM D 4791, should be avoided when making high-strength concrete. Aggregate particles should be clean and free of any materials that would degrade, such as organic matter, clay ...


Answer (1 of 2): Fine aggregates are really sands, that is sharp sand, not the sort that you find on the beach which has rounded edges. Coarse aggregates can be used in more than one grade size. Again the more angular the aggregates to aid bonding with the liquid cement gel the better. The size o...


HIGH-PERFORMANCE CONCRETE: INFLUENCE OF COARSE AGGREGATES ON MECHANICAL PROPERTIES. Test results are reported from an experimental study in which the effect of four coarse aggregate types, locally available in central Texas, on the mechanical properties of low water-cement ratio mixes, namely compressive strength, elastic modulus, and flexural strength was investigated.


Aggregate is a granular material, such as sand, gravel, crushed stone, crushed hydraulic-cement concrete, or iron blast-furnace slag, used with a hydraulic cementing medium to produce either concrete or mortar. Those particles that are predominantly retained on the 4.75 mm (No. 4) sieve, are called coarse aggregates. Those particles passing the 9.5 mm (3/8 inch)


Answer (1 of 9): Consider concrete as a matter containing different particles(aggregates of different sizes) joined together by binder Material I.e. cement, flyash ...


🕑 Reading time: 1 minute Coarse aggregate is one of the essential components of concrete and occupies the largest volume in the mix. That is why it greatly affects the concrete mix design. Its properties such as strength, maximum size, shape, and water absorption influence water demand, the quantity of cement and fine aggregate in […]


demolished waste as coarse aggregate 1. prepared by :-kishan thakkar ashish nagpal 2. demolished waste as coarse aggregate in concrete production 3. introduction • as urbanization is increasing over time, the demand for new buildings and infrastructure has sharply risen.


Cost of concrete mainly depends on coarse aggregate. 70% - 80% of volume of concrete is consumed by coarse aggregate. The conservation in natural resources is reduced by the replacement of over burnt brick bat in concrete. Over burnt brick waste reduces the weight of concrete maintains strength …


Concrete mainly consists of coarse aggregates which account for around 70–80% of the volume of the concrete mixture. Thus, the coarse aggregate plays a significant role in the strength and performance of concrete members.


To obtain high strength concrete, coarse aggregate size is usually held to a maximum size of 19 mm, but additional cement is required for the additional surface area. The fine aggregate can generally contain less material passing 300 um and 150 um sieve because of the higher cement content.


on the type of aggregate, especially for High strength concrete. Kalra [13] studied the effect of coarse aggregate size on strength of high performance concrete (HPC). Three sizes of coarse aggregates 10mm, 12.5mm and 16mm with two types of fine aggregate with fineness modulus 2.65 and 2.88 were used in the study.


to make high-strength concrete, it is easier to do so with coarse aggregates below 12.5 mm (Y, in.) (ACI 363-95). There has not been much research on the effects of coarse aggregate content


The produced coarse recycled concrete aggregate is sent to a rotary kiln for calcination, which can burn the combustible impurities into ashes. The calcined aggregate is then ground into powder by ball mills and Raymond mills. The calcination treatment method removes the combustibles in the recycled concrete aggregate and reduces the moisture ...


The CS concrete with 50% coconut shell as coarse aggregates replacement exhibited 21.45 MPa of compressive strength at the 28 th day under full water curing, which satisfied the requirement for structural lightweight concrete at 17 MPa. The average self-weight of CSC with 50% coconut shell as a coarse aggregates replacement also fell within the ...


Recycling of Brick Aggregate Concrete as Coarse Aggregate ... Jul 07, 2015· Also, in-situ strength of an old structure has been compared with the compressive strength of recycled aggregate concrete made with the recycled aggregate collected from the same structure.


For each type of coarse aggregate 25 numbers cubes (150x150x150mm) were cast to allow the compressive strength to be monitored at. 56 days. Test result show that concrete made from A type aggregate has higher compressive strength Keywords: Compressive strength, effect of Aggregate, Concrete, Alccofine.


This paper is related to a laboratory program for the shear strength of reinforced concrete corbels (RCC) cast with or without recycled aggregate (RA) by investigating the main parameters affecting the corbels behavior including the replacement aggregate recycling ratio, fcu, and shear span to effective depth ratio a/d. Eight specimens were cast and tested.