To improve the high brittleness of recycled aggregate concrete containing iron ore tailings (TRAC), the feasibility of adding polypropylene fiber (PPF) to TRAC was studied by performing a compression stress–strain curve test, scanning electron microscope characterization, and a freeze–thaw cycle test. The results indicated that PPF had a beneficial impact on reducing the brittleness of TRAC.
The compressive aggregate strength is an important factor in the selection of aggregate. When determining the strength of normal concrete, most concrete aggregates are several times stronger than the other components in concrete and therefore not a factor in the strength of normal strength concrete.
Nov 11, 2014 This study examined that compressive and flexural strengths of recycled aggregate concrete at 7 and 28 days and compared the strength with control mix with natural aggregates. The strengths showed very minimum fluctuations between the mixes. The compressive strength of all mixes exceeded at the age of 28 days.
This paper investigates the effect of recycled coarse aggregate incorporation on the relationship between 150 mm cubic and Փ 150 mm cylindrical compressive strength (the reference strength of standards) by comparing data from recycled and natural aggregate concrete compositions in which both cubes and cylinders were tested.
However, the compressive strength of mixes with 10, 15, 20, and 25% of coarse coal waste aggregates (coal waste replacing natural coarse aggregates) is decreased by 1.7, 1.1, 13.9, and 22.8%, respectively, in comparison with the control specimen.
compressive strength. There are many variables that influence recycled concrete compressive strength (grading curves, maximum size fraction, natural aggregate source, cement class, possible admixtures, etc.) which have not been taken into account. In fact, it is really difficult to take all these variables into account.
highest compressive and tensile strength values were 80.5MPa and 4.77MPa respectively. These values were attained when the electric arc furnace steel slag was used as a coarse aggregate with the ordinary Portland cement for 0.4 water to cement ratio. Keywords: concrete, electric arc furnace slag, aggregates, cement, compressive strength ...
Feb 01, 2009 From Fig. 3, it is clear that the strength for the concrete mix made with recycled coarse aggregates from stronger concrete produced almost the same compressive strength as that of the concrete made with natural coarse aggregate. The concrete made with recycled aggregates from weak or unknown strength, however, resulted in lower strength.
Primary concrete of pebble coarse aggregate were used as the source of recycled aggregate concrete for pebble recycled coarse aggregate. Replacement rate of recycled aggregate for change parameter, 99 specimens were designed. The prism compressive strength, cube compressive strength and flexural strength were tested and achieved. The test results show that damage process and form of …
Moreover, this behaviour does not depend on the aggregates size for concrete made with aggregates size 12.5 mm. (iv) The substitution of natural aggregates with 25%, 50%, and 100% of recycled aggregates decreases the compressive strength by about 15%, 25%, and 32%, respectively.
Therefore, a possible correlation between compres- of natural and recycled aggregates on the slump and compressive strength of concrete. Cement and Concrete Research 34 (1), 31–36. sive strength (reported in this paper) and durability (not covered Qian, Z., (Ph.D. Thesis) 2012.
Dec 29, 2017 The use of stone dust in concrete provides environmental benefits by reducing the impacts produced by the extraction of natural sand. The use of this material can also offer economic advantages, since the product is less costly than natural sand. In this way, the present work evaluated the compressive strength of concretes made with stone dust in different replacement levels (30% …
Jan 02, 1992 It was found that these soaked aggregates achieved an 80%–90% degree point of saturation. A comparative study between the behavior of RAs and natural aggregates employed in SCC has determined that the RAs concrete has a higher compressive strength at 28 days which is even greater at 90 days. This is attributed to internal curing due to the water absorption and retention of the …
Apr 25, 2014 At the same time, the compressive strength at 20 % replacement is found to be 38.96 N/mm2. Also, there is sudden fall in strength at 40% and 60% replacement, as the quantity of RCA increases. At 60% replacement, the compressive strength is about 29.52 N/mm2which is less that 31.6 N/mm2. Table 7: Result of slump test