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Compressive strength of hardened concretes made from recycled concrete coarse aggregates was studied as a function Of the compressive strength of original concretes from which the coarse aggregates were derived Also studied were properties of fresh concretes made from recycled aggregates, gradings of crusher products, properties of recycled aggregates, and the amount of old mortar that remains .
The Recycled pathway material. As part of this commitment to sustainability, ULTITREC is a recycled pathway material produced from selected arisings from highway and maintenance works. It provides a versatile and cost effective surface for a variety of locations such as woodland paths, canal towpaths, footpaths, cycle ways, public parks and golf courses.
Recycled concrete aggregates (RCA) are used in new concrete mixes, termed recycled aggregate concrete. (RAC). Among losses in most fresh and hardened properties, literature reports that RAC suffers increased. levels of drying shrinkage compared to equivalent mixes .
unawane and Pimplikar (2013) studied the properties of recycled aggregates and compare it . with the natural aggregates. The basic mechanical properties like compressive strength, flexural strength and workability were tested. They reported that use of recycled aggregates up to 30% doesn't affect the functional properties of concrete. Akbari . et al.
RCA as Replacement of Coarse Aggregate. The recycled aggregate (RCA) from the crushing plant was further processed in a Los Angeles abrasion test machine by using steel balls and rotated a total number of 700 revolutions 33 rpm for each batch of total weight 10 .
This paper investigates the workability, compressive strength, and elastic modulus of normalstrength concrete with recycled concrete aggregate (RCA) as replacement for coarse natural aggregate (for example, crushed stone, gravel).
Dec 01, 2013· Free Online Library: Use of recycled concrete aggregate in concrete: a review.(Report) by "Journal of Civil Engineering and Management"; Engineering and manufacturing Aggregates (Building materials) Usage Waste management Concrete Chemical properties Mechanical properties Production processes Concretes Recycled materials
workability and consistency of the mix after the initial series of trials, 1/3 of the ... The density of concrete containing recycled aggregates was less than that of the normal CQncrete (2,400 kglm'). Furthennore, the density of concrete containing
standard mix (2) a mix with recycled aggregates to replace the coarse aggregates, (3) recycled aggregates and 10% Pozzolana, (4) recycles aggregates and 20% Pozzolana, (5) recycled aggregates and 30% Pozzolana. The fresh and hardened concrete mixtures were tested for workability, durability and compressive strength
of fresh recycled aggregate selfcompacted concrete (RSCC) were determined by different methods, which included the normal slump test, Vfunnel test and Jring test. The workability of recycled normal concrete (RNC) was determined by slump test. The concrete specimens were cast and kept at the steel moulds for 24 hours.
Jun 23, 2017· The expansion increases with the dosage of recycled glass in the mix, but also at the of gravel replacement with waste glass it remains lower than the limits prescribed by the rule for classifying the aggregate as reactive (at t = 14 days the expansion must be less than %), both with and without the hydrophobic admixture (Fig. 9).
assess the workability of the control concrete and the concrete containing rubber aggregates. It is worth men tioning that we measured the shrinkage of all mixtures F2 . Figure 1. Aggregates rubber used in the study. Table 1. Mix proportions of first control mix [14]. Materials (kg/m3)
Dec 20, 2018· In all mixes, coarse aggregates were totally replaced by recycled aggregates. For the fraction 0/2 mm natural sand was used. The water absorption of the recycled aggregates was taken into account by adding the sucking water to the mix. A mixture containing 100 % natural aggregates was used as reference. Concrete for pavements
This study presents the effects of recycled concrete aggregate (RCA) on the key fresh and hardened properties of concrete. RCA was used to produce highworkability concrete substituting 0 natural coarse aggregate (NCA) by weight. The slump and
tire chips can be used to replace coarse aggregate in concrete pavement mixtures. Two mixtures with 10% coarse aggregate replaced by tire chips and normal cement content had the best performance. The workability was comparable to the control mixture, and the air content reached 6%.
Oct 09, 2014· Utilizing recycled aggregate is certainly an important step towards sustainable development in the concrete industry and management of construction waste. Recycled aggregate (RA) is a viable alternative to natural aggregate, which helps in the preservation of the environment.
Aggregates can be produced by crushing hydraulic cement concrete and are known as recycled concrete aggregates (RCA). This report provides results from a New Jersey Department of Transportation study to identify barriers to the use of RCA in new Portland cement concrete and to provide a .
The Kansas and Wyoming recycled pavements included some recycled fine aggregates, resulting in a fine aggregate grading that was closer to the middle of the specified fineness modulus range ( and, respectively) than that of their corresponding control pavements ( and, respectively).
100 % of recycled aggregate was used in the mix as a coarse aggregate for the recycled aggregate concrete. Based on mix design by IS method, the target workability in this studied is between 3965 mm. Types and Use of Pozzolanic materials The benefits of pozzolana utilization in cement and concrete are threefold. First is the economic
workability more rapidly than the conventional concrete, because recycled aggregate is more porous than natural aggregate Thus concrete with recycled aggregate may require more mixing water to achieve the same workability as original aggregate Recycled aggregates produced from good quality concrete can be expected to. Get Info
workability. Recycled fines, when used, are generally limited to about 30 percent of the fineaggregate portion of the mixture. (1) Performance: Angularity of RCA: 1. Helps to increased structural strength in the base, resulting in improved load carrying capacity: 2. Building pads (residual cementation), provides a strong, durable platform for which
Properties of HighWorkability Concrete with Recycled Concrete Aggregate Using the same W/C ratio, S/A ratio and HRWR dosage of control concrete, four different concretes were designed with RCA 30
2011; 14(2) Properties of HighWorkability Concrete with Recycled Concrete Aggregate 253 can be obtained in the presence of RCA owing to good interfacial The modulus of elasticity of concrete is influenced by the moduli bond between aggregate and mortar matrix9.
workability and compressive strength properties of concrete containing recycled concrete aggregate This paper describes two laboratory based experimental studies to determine some plastic and hardened properties of concrete incorporating recycled concrete aggregates.
Nov 16, 2014· Recycled aggregate concrete 1. RECYCLED CONCRETE 2. Recycled concrete 3. Recycled concrete When a structure made of demolished or renovated concrete is called recycled concrete. Concrete aggregate collected from demolition sites is put through a crushing machine. Crushing facilities accept only uncontaminated concrete, which must be free
