The main purpose of this paper is to study the feasibility of producing concrete made of recycled materials, by using coal fly ash (FA) or granulated blast-furnace slag …
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However, the compressive strength of concrete at the age of 28 days with partial replacement of fly ash shown improvement up to 10% by about 2.42% and 3.89% but, beyond …
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When 5% fly ash is added to the concrete then the strength and workability both increases but when we add 10% and 15% at both percentages the strength as well as the workability of the …
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Ample data are available for compressive strength of the concrete. Several researchers have studied these effects and reported the same in the literature. ... Bottom ash …
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In this connection, researchers have carried out investigations on effective utilization of fly ash in cement manufacturing, manufacture of concrete/autoclaved aerated concrete …
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Many concrete mixtures containing class C fly ash, up to 35%, have similar 28-days strength gain characteristics as plain cement concrete. ... Portland cement/ fly ash concrete can gain 50 to ...
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Replacing cement by fly ash in concrete brings several benefits. ... However, the long-term (after 90 days) compressive strength of FA60 is comparable to that of FA40, which is …
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The compressive strength of HVFA concrete has been reported to decreased as the percentage cement replacement increased, Table 1. ... The early age performance of …
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In recent years, attempts to increase the utilisation of fly ash to partially replace the use of Portland cement in concrete are gathering momentum.
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This paper discusses the effect of both partial and full replacement of natural coarse aggregates by coarse RCA in a fly ash concrete. Engineering properties and durability …
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shows the variations in compressive strength of concrete with various percentages of FA at 3, 7, and 28 days. For FA0, the compressive strength increased from 18.6 MPa to 24.0 …
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Several researchers have reported ... weight of cement the increase in 28 days compressive strength was 7% while the increase was about 9% when ... "Heat evolution of high volume fly ash ...
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Lohani et al. [23] replaced fly ash in recycled concrete with OPC at levels of 0–, by weight and activated with NaOH solution. The results indicated lesser workability, …
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Several experimental studies have ... The replacement of cement with fly ash concrete could be up to 20% to produce high strength concrete. ... Concrete compressive …
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The amounts of scaling were unacceptable for several mixtures with high dosages of fly ash. ... showed that if using a relatively rapid hardening binder combination (2 days …
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cement and fly ash, which was obtained with X-ray Fluorescence (XRF) analyses. As it is possible to see, the composition of this fly ash is rich in Si and Al oxides, with few quantities of calcium …
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At the curing age of 28th days, the concrete containing 5% and 10% fly ash as cement gained 1.66% and 2.97% of strength, respectively. This study suggests that the partial …
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14: 90% Base 1 and 10% fly ash 100 16: 90% Base 1, 5% fly ash, and 5% cement 462 Mixes that incorporated either fly ash or fly and cement performed better than the soil …
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This paper presents the results of an experimental investigation to evaluate the mechanical properties (workability and compressive strength) of concrete mixtures in which …
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These results are similar to those of Siddique (2003) who reported that, when fly ash was used as an addition of cement (i.e. 28% by weight of cement) in concrete, there was a 23% gain in strength ...
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Fly ash use in concrete improves the workability of plastic concrete, and the strength and durability of hardened concrete. Fly ash use is also cost effective. When fly ash is …
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containing 10 % of fly ash, related to cement mass, gained a compressive strength about 6 % higher than the concrete addition for Ordinary Portland cement. For fly ash blends greater than …
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Hence, it may be inferred that though the compressive strength of concrete mixes at 7, 28 and 90 days are less than that of control concrete mix (CS-00) except 7 day …
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The addition of fly ash in cement concrete has been observed to slow down the process of strength gain, especially in cold regions, due to which the compressive strength of …
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Concrete is a very adaptable building material with minimal maintenance requirements over its service life. However, the durability of ordinary Portland cement (OPC) …
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These various specimens of fly ash and nanosilica cement concrete are to be tested 7 days, 14 days and 28 days to find compressive strength and also analyze through SEM.
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To quantify and propose a systematic multiscale model for predicting the compressive strength of cement concrete containing up to fly ash, with varying coarse …
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Fly ash is a fine powder from the combustion of pulverized coal. About 12.8 million metric tons or 36% of the total fly ash produced in the United States in 2017 was used as a …
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According to several reports, cement manufacture is one of the largest sources of carbon dioxide in the concrete sector. ... properties beyond 28 days. The reactivity of fly ash [500 µm] is ...
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The production process of PC directly contributes towards several environmental impacts including consumption ... reported a compressive strength equivalent to 78% of the …
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