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The density, thermal conductivity, flexural and compressive strength of ed concrete with different mass percentages of RPP agent are exhibited in Figure 1 and 2. It can be found that addition of . ... The flexural and compressive strength of specimens with agent added. 3.2. The effects of stabilizer in ed concrete Figure 3.
The study is focused on ultra-light concrete (FC) aimed as a thermal insulation material. Two important properties of such material were investigated: compressive strength and thermal conductivity. In the conducted tests, the influence of the air-dry density (200–500 kg/m3), type of ing agent (synthetic and protein) and binder …
This study aims to obtain the relationship between density and compressive strength of ed concrete. ed concrete is a preferred building material due to the low density of its concrete. ... It was shown that the compressive strength of 20% dosage was highest with 8.8 MPa, followed by 25% (7.5 MPa), 30% (4.2 MPa), and 35% …
The objective of this paper is to propose prediction relations for the compressive strength of concrete by extending two of the well-known relations …
In general, it is reported that the ratio of tensile strength to compressive strength of ed concrete ranges between 0.2 and 0.4 which is higher compared to …
Further, improved microstructure with smaller air voids in concrete with NPE + CMC results in 10%–25% relatively higher compressive strength than SLS + CMC concrete mixes. Factors influencing the performance of cement emulsified asphalt mortar – A review
ed concrete (FC) is a kind of lightweight concrete composed of cement, water, filler and . With the advantages of low density, good fluidity and good fire resistance [1,2,3,4], FC is widely used as a building material in insulation walls, sound-absorbing materials, road base backfill, etc.In pavement and bridge engineering, using …
The images indicate that, because of the high amount of in the mix, the bubbles were very close to each other, explaining the low compressive strength of concrete. Also, [ 13 ], using SEM images, showed protein-based ed concrete has unconnected isolated pores of smaller size, circular with a well-defined boundary …
Liu et al. reported that the compressive strength of concrete showed an inverted V-shaped change with the increase in the water/cement ratio. If the w/c ratio is below the optimal limit, thinner-walled and irregular s occur, and the compressive strength is negatively affected. The use of the w/c ratio above the optimal limit results in ...
concrete is a type of concrete that stands out with its lightness, waste potential, controlled low strength, thermal insulation, acoustics performance, and …
concrete is a promising material in building and construction applications, providing such outstanding properties as high specific strength, excellent thermal insulation, and effective acoustic absorption in human-inhabited buildings. However, because the porosity and permeable water absorption properties of concrete are …
Indeed, the compressive strength value is affected in a complex manner by the volume of entrained and entrapped air provided by the (air/cement ratio), which is not relevant to normal-weight concrete but of interest in lightweight concrete, especially in the low density range as the one analyzed in this study [37].
The entraining and distribution of air voids in the concrete matrix is a complex process that makes the mechanical properties of lightweight ed concrete (LFC) highly unpredictable. To study the complex nature of aerated concrete, a reliable and robust prediction model is required, employing different machine learning (ML) …
The dry density, water absorption, and compressive strength of concrete are tested according to the methods specified in the specification of concrete (JG/T 266-2011), as shown in Formulas (2)–(4). The size of the concrete sample is 100 mm × 100 mm × 100 mm, with three samples for each group. ...
The compressive strength, dry density and specific strength of geopolymer-based concrete at the age of 28-day are shown in Figure 2. It can be found that the compressive strength and dry density of the geopolymer-based ed concrete decreases continuously with the increase of the content.
Its compressive strength is similar to sandy soil. A 4" slab contributes about 50 psf of load; add a 40lb live load and you're still below 1 pound per square inch. The compression curve for plastic is usually pretty straight, so insulation rated at 15 psi would compress somewhere in the neighborhood of 0.015 of its thickness.
A typical variation of strength with dry density for concrete with a filler–cement ratio 1 at different ages is plotted in Fig. 6. For both cement–sand and cement–fly ash–sand mixes, compressive strength increased with increasing dry densities, as expected, due to the lower pore volume.
The 28 d compressive strength, thermal conductivity and strength retention coefficient of the MPC concrete prepared with dry densities varying from 300 to 1000 kg/m3 are 1.8–21.6 MPa, 0.136 ...
The total volume of pores, namely porosity, correlates with density and plays an important role that affects the compressive strength of concrete (Matusinović et al., 2003). In this study, the connectivity of pores refers the interaction of introduced voids, and this characteristic determines the strength and permeability of concrete.
In a previous study, the static compressive strength of CF- concrete with the same mix design has been tested and obtained. The result showed that with CF content growing from 0.0 to 2.5%, the static compressive strengths first increased and then decreased, the values of which were 0.82, 0.96, 1.20, 1.51, 1.42, and 0.73 MPa, respectively. ...
In ed concrete, the compressive strength reduces with decreasing density. Generally, a denser ed concrete produces higher compressive strength and lower volume of voids. In the present study, the tests were carried out in stages in order to investigate the effect of sand-cement ratio, water to cement ratio, dosage, and …
The novelty and significance of the present study are concerned with the prediction and estimation of LFC compressive strength against different combinations …
1. Introduction. concrete (FC) is a kind of lightweight concrete that is often prepared by adding preformed to cement slurry [1], [2].FC has been widely used in recent years due to its high flowability, low cement content, cost reduction, and excellent thermal insulation [3], [4], [5].In practice, FC has been commonly used for slab structures, …
concrete (FC) has the potential of being an alternative to ordinary concrete, as it reduces dead loads on the structure and foundation, contributes to energy conservation, and lowers the cost of production and …
high-strength concrete, otherwise the strength of the resultant concrete will be drastically reduced. Kearsley and Visagie [1999] reported that, using unclassified fly ash, of which around 40% of the particles have diameters exceeding 45 μm, the 56 day compressive strength of concrete with wet density of 1500 kg/m3 could achieve ...
Apart from that, there are still some existing challenges that obstruct the application of ed concrete. The main issue is the lower compressive strength of ed concrete compared with conventional concrete. In the range of 400–1600 kg/m 3 dry densities, the compressive strength of up to 15 MPa can be achieved . Another …
In this study, a strength - porosity model for concrete is developed by adopting the. generalized model of Balshin which can be expressed similar to the form. σ. =. σ. (1 ) n −. In the ...
This contribution aims to highlight, from an experimental point of view, the key factors affecting the compressive strength of ed concrete. An experimental campaign has been conducted on a...
At the same compressive strength, it can be found that the flexural strength of LCC was similar to LWAC and greater than conventional concrete. The ratio between flexural to compressive strength of LCC was from 0.10 to 0.24 which is greater than that of traditional concrete (0.06 to 0.10).
The article presents a deep neural network model for the prediction of the compressive strength of ed concrete. A new, high-order neuron was developed for the deep neural network model to improve the performance of the model. Moreover, the cross-entropy cost function and rectified linear unit activation function were employed to …
Porosity is considered to have a significant impact on compressive strength of concrete [].In this study, a strength-porosity model for concrete is developed by adopting the generalized model of Balshin which can be expressed similar to the form σ y = σ o (1−n) b.In the cellular concrete model of concrete made of neat …
The effects of ed concrete density, cement type and content, water/cement ratio, type and curing regime will influence the compressive strength. ed Concrete Density Historically, the definition of a ed concrete is a material that has an air content of over 20% by volume.
Amran et al. [57] performed a study on fibre-reinforced concrete produced from polypropylene fibres, silica fume, and fly ash. It is visualized that by the inclusion of fly ash, polypropylene fibres present in concrete have improved the compressive strength. There was an 80 to 90 percent increase in strength.
1. Introduction. ed concrete, belonging to the wider class of lightweight concrete, is a special type of concrete that typically includes cement, water, preformed and fine sands, in conjunction with other sand-like fine particles such as fly ash or silica fume [1].The components mixed with the cement paste give rise to the …
C869/C869M-11(2016) Standard Specification for ing Agents Used in Making Preformed for Cellular Concrete . C1622/C1622M-10(2016)e1 Standard Specification for Cold-Weather Admixture Systems . ... C873/C873M-23 Standard Test Method for Compressive Strength of Concrete Cylinders Cast in Place in Cylindrical Molds .
