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(–) compactness of aggregate w / c ratio of the weight of water to the weight of cement 272 D.H. Nguyen et al. / Construction and Building Materials 73 (2014) 271–282

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(–) compactness of aggregate w / c ratio of the weight of water to the weight of cement 272 D.H. Nguyen et al. / Construction and Building Materials 73 (2014) 271–282

But for SCC with recycled coarse aggregate (RCA), a significant increase in T 500 time of about 38.89% and 116.67% was observed at 10% and 20% RP respectively. This can be attributed to trade-offs between full replacement of FA by RP, leading to a higher interlocking between the particles in a fresh state and the agglomeration of the ...

compactness of coarse aggregate, the higher of the void ratio, the poorer of compactness of coarse aggregate. It can be seen from Table 1 that the void ratio of RCA is higher than NCA. Table 1. Physical properties of the coarse and fine aggregate. Aggregate Type Apparent Density (kg/m 3) Loose Packing Density (kg/m 3) Dry-Rodded Density (kg/m3 ...

Sep 05, 2018· An effective compactness-monitoring method for DCL compound concrete is needed urgently. In this study, a simple and rugged lead zirconate titanate (PZT)-based smart aggregate (SA) for monitoring compactness using transient excitation was tested in the laboratory. The same type of sensor was used as both the excitation and the receiver transducer.

The local natural medium-coarse sand was used as the fine aggregate, with a fineness modulus of 2.9, an apparent density of 2640 kg/m 3, and a sand ratio of 38% . The coarse aggregates were selected from local pebbles, and the particle size was adjusted to …

the maximum compactness of aggregates such as Fuller-Talbol's. ... The concepts rely on coarse aggregate for the skeleton of the mixture with the proper amount of fine aggregate to provide a ...

Jun 20, 2020· With the contribution of coarse and fine aggregate, composition of gradation, and the plastic strain calculation model of single-size gravels, the plastic strain prediction model of graded gravel mixture was established as follows: (3) ε p = 1 FI ∑ i = 1 n ρ i ρ 0 M i ε pi + 1 + d f M f ε pf where, FI is the skeleton index of coarse ...

Although steel fibre-reinforced recycled coarse aggregate concrete (SFRCAC) is a promising structural material owing to its good mechanical properties and minimal environmental impact, there are ...

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)

Mar 30, 2016· Cem Concr Aggregates 2001; 23(1): 3–10. [3] Basri HB, Mannan MA, Zain MFM. Concrete Using Waste Oil Palm Shells As Aggregate. Cem Concr Res 1999(29): 619–22. [4] Padmini AK, Ramamurthy K, Mathews MS., Behaviour of Concrete With Low-Strength Bricks As Lightweight Coarse Aggregate. Mag Concr Res 2001; 53(6):367– 75.

particles which increase the compactness of concrete and fills the spaces in the concrete mortar. Using fly ash in the concrete generally increases the workability, decreases the bleeding, ... Coarse aggregate – crushed 20mm maximum size – IS383 – 1970 .

Effect of coarse basalt aggregates on the properties of ... The powder content effect on compactness and strength of UHPC with coarse basalt aggregate is analysed and discussed, and optimum powder content and corresponding value of distribution modulus q are suggested.

A lower coarse-aggregate angularity leads to a smaller skid resistance of the asphalt mixture. ... allowed the mixture to reach the requir ed degree of compactness. with less compaction time. In ...

Aggregates Are Mainly Classified into Two Categories: Fine aggregate; Coarse aggregate; The fine aggregate is natural sand that has been washed and sieved to remove particles larger than 5 mm, and the coarse aggregate is a gravel that has been crushed, washed and sieved so that the particles vary from 5 to 50 mm in size. The fine and coarse ...

smaller sized coarse aggregate produces higher strengths for a given water-to-cement ratio. In fact, it is generally agreed that, although larger coarse aggregates can be used to make high-strength concrete, it is easier to do so with coarse aggregates below 12.5 mm (Y, in.) (ACI 363-95).

The void ratio of coarse aggregate is calculated by the difference between their apparent density and bulk density. The void ratio mainly reflecting the compactness of coarse aggregate, the higher of the void ratio, the poorer of compactness of coarse aggregate. It can be seen from Table 1 that the void ratio of RCA is higher than NCA.

Natural aggregate), low specific gravity(0.9 as compare to 2.74 for Natural aggregate), and density value(0.81 as compare to 3.14 for Natural aggregate), as compare to Natural coarse aggregate. Their test results were based on 20% substitution of natural coarse aggregate with plastic aggregate.

Then, UHPCs applying coarse basalt aggregate are designed by using the particle packing theory and optimal mineral proportion. The basalt aggregate size effect on mechanical strength is measured and analysed. The powder con-tent effect on compactness and strength of UHPC with coarse basalt aggregate is analysed and discussed, and optimum powder

reflecting the compactness of coarse aggregate, the higher of the void ratio, the poorer of compactness of coarse aggregate. It can be seen from Table 1 that the void ratio of RCA is higher than NCA. Table 1. Physical properties of the coarse and fine aggregate. Aggregate Type Apparent Density (kg/m3) Loose Packing Density (kg/m3) Dry-Rodded ...

Furthermore, a distribution modulus q of 0.19 for the modified Andreasen and Andersen model is recommended for designing UHPC with coarse aggregates. The optimal powder contents are the same for UHPC without and with 2 vol% steel fibre, and longer fibre is suggested for UHPC with coarser aggregate. KW - Coarse aggregate. KW - Compactness

The powder content effect on compactness, strength and distribution modulus of UHPC is analysed. • The interaction between coarse aggregate and steel fibre in UHPC is discussed. Abstract. In the present research, Ultra-high Performance Concretes (UHPCs) applying coarse basalt aggregate with a maximum particle size of 16 mm are designed by ...

And a gradation design model was developed for the coarse aggregate skeleton. 4.75mm was deﬁned as the dividing size between coarse ... the maximum compactness of aggregates such as Fuller ...

aggregate to coarse aggregate. Including the rheology of SCC, it has been specified a moderate plastic viscosity and a low yield shear stress that have the influence of particle packing, the content of fine materials and the problem of the high coarse aggregate volume in the stability of the concrete [1, 7]. These differences can be better observed

optimal compactness of RCC mixture is determined by optimization of the sand to aggregates ratio (S/G) and the water content corresponding to the highest compactness [12]. The coarse aggregates are soaked into water for 24 hours before mixing. The RCC mixing procedure is about 6 minutes long. At the end of mixing, the concrete is put in

with higher coarse aggregate size i.e., 20mm was highly workable than 16mm and 12.5mm. Among 20mm, 16mm and 12.5mm the dispersion of the particles for 12.5mm would be difficult for the same amount of super plasticizer because the smaller size coarse aggregate has more specific surface area than the larger size aggregate. Table 3.

Even if all the coarse aggregates are RCAs, as long as the strength and surface compactness satisfy the requirements for structure concrete, the durability of SFRCAC can satisfy the requirements. With the proper mixture design method, the RCA can replace the NCA for fabrication of …

In the concrete preparation, natural quarzitic sand was used as fine aggregate, with density of 2.64 g/cm 3 and fineness modulus of 1.64. Granitic gravel was used as coarse aggregate, with density of 2.68 g/cm 3, fineness modulus of 6.01 and 4.75–12.5 mm in size. Fig. 6 shows the PSD of the aggregates. Download : Download high-res image (88KB)

Both natural coarse aggregates and recycled coarse aggregates have a continuous grain size distribution of between 5 and 20 mm. The main properties of coarse aggregates are summarized in Table 2 . River sand was extracted as fine aggregates, with a fineness modulus of 2.52, a water absorption rate of 0.8%, and a specific gravity of 2.69.