scholarly journals Effect of matrix particle size on EPS lightweight concrete properties

2018 ◽  
Vol 251 ◽  
pp. 01027
Author(s):  
Duc Hoang Minh ◽  
Ly Le Phuong
Keyword(s):  
Particle Size ◽  
Compressive Strength ◽  
Lightweight Concrete ◽  
Aggregate Size ◽  
Expanded Polystyrene ◽  
Coarse Aggregates ◽  
Concrete Mixtures ◽  
Maximum Particle Size ◽  
The Matrix ◽  
Maximum Particle

Expanded polystyrene lightweight concrete is a composite which can be made by adding expanded polystyrene aggregate in normalweight concrete (as matrix). The research was focused on the effect of properties and volume of the matrix on the properties of lightweight concrete. The results show that properties of structural polystyrene concrete, such as workability and compressive strength, depend on the aggregate size of the matrix. It also shows that decreasing aggregate size of the matrix is the effective way to increase workability and compressive strength of lightweight concrete. When the density of concretes decrease by 200 kg/m³, slump values decrease by about 20 to 30 mm with lightweight concrete mixtures using maximum particle size of 0.63 mm, while slump values decrease by about 40 mm with the mixtures using maximum particle size of 20 mm. At the same density, the compressive strength of the structural polystyrenre concrete significantly decreased when the coarse aggregate diameter greater than 10 mm. Therefore, coarse aggregates with diameter size are smaller than 10 mm was recommended to use for matrix. In the result, expanded polystyrene concrete with density from 1,400 kg/m³ to 2,000 kg/m³ and compressive strength more than 20 MPa for structural application was made.

Effects of maximum particle size of coarse aggregates and steel fiber contents on the mechanical properties and impact resistance of recycled aggregate concrete

2021 ◽  
pp. 136943322110179
Author(s):  
DongTao Xia ◽  
ShaoJun Xie ◽  
Min Fu ◽  
Feng Zhu
Keyword(s):  
Mechanical Properties ◽  
Particle Size ◽  
Steel Fiber ◽  
Impact Resistance ◽  
Recycled Aggregate Concrete ◽  
Recycled Aggregate ◽  
Aggregate Concrete ◽  
Coarse Aggregates ◽  
Maximum Particle Size ◽  
Maximum Particle

Fiber reinforced recycled aggregate concrete has become a new type of green concrete material. The maximum particle size of coarse aggregates and steel fiber contents affect the mechanical properties and impact resistance of recycled aggregate concrete. However, such studies are rare in literature. The present paper shortens the gap through experimental study. A total of 144 specimens of 12 kinds of concrete mixtures were tested, which adopted different steel fiber volume admixtures (0%, 0.8%, 1.0%, 1.2%) and recycled coarse aggregates in different maximum particle sizes (9.5, 19, 31.5 mm) replacing 30% natural coarse aggregate. The compressive strength, splitting tensile strength, and impact resistance of the 12 concrete mixtures were tested. The results showed that the compressive strength, splitting tensile strength, and impact resistance of recycled aggregate concrete increased first and then decreased with the increase of the maximum particle size. The recycled aggregate concrete with the maximum particle size of 19 mm had the highest mechanical properties and impact resistance. Besides, with the increase of steel fiber content, the compressive strength, splitting tensile strength, and impact resistance of recycled aggregate concrete showed an increasing trend. Considering a large amount of experimental data and the coupling effect of steel fiber contents and the maximum particle size of coarse aggregates, the Weibull distribution function was introduced to analyze the impact test results and predict the number of resistance to impact under different failure probabilities. The results showed that the number of blows of the recycled aggregate concrete followed a two-parameter Weibull distribution, and the estimated value of the number of resistance to impact for failure increased with the increase of the failure probability.

Influence of Maximum Particle Size, Fines Content, and Dust Ratio on the Behavior of Base and Subbase Coarse Aggregates

2017 ◽  
Vol 2655 (1) ◽  
pp. 20-26 ◽  
Author(s):  
Rabindra Chaulagai ◽  
Abdolreza Osouli ◽  
Sajjad Salam ◽  
Erol Tutumluer ◽  
Sheila Beshears ◽  
...  
Keyword(s):  
Particle Size ◽  
High Strength ◽  
Maximum Size ◽  
Fines Content ◽  
Coarse Aggregates ◽  
Maximum Particle Size ◽  
Maximum Particle ◽  
Improved Performance ◽  
Aggregate Base

Unbound aggregate base and subbase layers are the main load-bearing layers in a pavement structure. Size and shape properties of these aggregate materials should be controlled to ensure proper workability during construction and improved performance for pavement longevity. The effects of gradation, maximum particle size, fines content (percentage passing the No. 200 sieve), and dust ratio on the quality of aggregates were investigated by performing many soaked California bearing ratio tests on a crushed limestone material. The dust ratio represents the amount of fines content divided by the amount of minus No. 40 sieve material. The dust ratios studied were 0.4, 0.6, and 1.0. Two gradations commonly used in Illinois, with maximum particle sizes of 1 in. and 2 in., were studied to analyze the effect of fines content with respect to maximum particle size in the gradation. A typical range of fines contents (i.e., 5%, 8%, and 12%) was also considered. The results show that the gradation, dust ratio, and fines content should be taken into account in the selection of aggregate properties for stability requirements. Aggregates with larger maximum size particles provide high strength, and they are not affected as much as aggregates with smaller maximum size particles by an increase in fines content. The aggregates with smaller maximum size particles provide lower strength. It was also concluded that samples with a dust ratio of 1.0 do not necessarily result in an aggregate material with low strength.

Influence of Aggregate on Workability of Self-Compacting Concrete

2012 ◽  
Vol 482-484 ◽  
pp. 1101-1104
Author(s):  
Huan Qiang Liu ◽  
Xi Chen
Keyword(s):  
Particle Size ◽  
Compressive Strength ◽  
Particle Shape ◽  
Shape Index ◽  
Self Compacting Concrete ◽  
Aggregate Gradation ◽  
Self Consolidating Concrete ◽  
Maximum Particle Size ◽  
Maximum Particle

The workability of self-compacting concrete is influenced greatly by aggregate. In this study, the effects of aggregate gradation, maximum particle size, sand percentage and particle shape on the workability of self-consolidating concrete were investigated. The results showed that the compressive strength and workability of self-compacting concrete were increased by increasing the particle size of aggregate, optimizing gradation, choosing proper sand percentage and increasing shape index in a certain range.

Study on Compressive Strength of Recycled Aggregate Brick with Construction Waste

2011 ◽  
Vol 477 ◽  
pp. 301-307
Author(s):  
Li An Zhou ◽  
Jia Long Chen
Keyword(s):  
Particle Size ◽  
Compressive Strength ◽  
Fine Particle ◽  
Curing Temperature ◽  
Recycled Aggregate ◽  
Particle Content ◽  
Construction Waste ◽  
Maximum Particle Size ◽  
Maximum Particle ◽  
The Impact

Recycling and reusing construction waste has become one of the focus issues which should be solved urgently in China with the rapid urbanization, construction of new countryside and large scale urban renewal. There are some researchers take study on the recycling and application of construction waste, but hasn’t systematic study about compressive strength of recycled aggregate brick until now though production and application of recycled aggregate brick is an important approach to reuse construction waste. This test has discussed the impact on the compressive strength of recycled aggregate brick due to recycled aggregate maximum particle size and fine particle content, water-cement ratio, cement-aggregate ratio, forming pressure and curing mode. These results showed that the finer maximum particle size, the higher fine particle content, forming pressure, curing temperature and humidity have notable impact on the compressive strength of recycled aggregate brick.

Properties of Cement-Based Materials Containing Melting Incinerator Bottom Ash

2011 ◽  
Vol 250-253 ◽  
pp. 834-838 ◽  
Author(s):  
An Cheng ◽  
Hui Mi Hsu ◽  
Sao Jeng Chao ◽  
Wei Ting Lin ◽  
Hao Hsien Chen ◽  
...  
Keyword(s):  
Experimental Investigation ◽  
Particle Size ◽  
Compressive Strength ◽  
Portland Cement ◽  
Bottom Ash ◽  
Pozzolanic Activity ◽  
Unit Weight ◽  
Maximum Particle Size ◽  
Cement Based Materials ◽  
Maximum Particle

This paper presents an experimental investigation on the effect of incinerator bottom ash (IBA) fineness and the cooled process of molten IBA on fresh mortar properties and compressive strength of hardened mortars. IBA with two finenesses, an original IBA, and a pulverizing incinerator bottom ash (PIBA) powder, with maximum particle size of 4.75 and 0.074 mm respectively were used to partially replace sand and Portland cement at 0%, 10%, 20%, 30%, and 40% by weight. The pozzolanic activity characteristics of powder were obtained from melting the above PIBA in an electric-furnace at 1450 °C for 1 h. and chilled by quenching in water (WIBA) and air (AIBA). Results indicate that incinerator bottom ash caused a reduction in compressive strength, unit weight, and flowability values when used as a replacement for sand and cement. However, IBA can be processed by melting to regain reactive pozzolanic activity, which may be used to partially replace cement.

scholarly journals Effects of Uncrushed Aggregate on the Mechanical Properties of No-Fines Concrete

2018 ◽  
Vol 8 (3) ◽  
pp. 2882-2886 ◽  
Author(s):  
M. A. Memon ◽  
M. A. Bhutto ◽  
N. A. Lakho ◽  
I. A. Halepoto ◽  
A. N. Memon
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Coarse Aggregate ◽  
Lightweight Concrete ◽  
Aggregate Size ◽  
Unit Weight ◽  
Conventional Concrete ◽  
Major Aspect ◽  
Coarse Aggregates ◽  
Cellular Concrete

Concrete’s self-weight is a major aspect of a structure’s overall weight. Recently, the use of lightweight concrete (no-fines, foamed and cellular concrete) has been increased. Normally no-fines concrete is produced with crushed coarse aggregate of uniform gradation. This study aims to investigate experimentally the effects of the use of uncrushed coarse aggregates on unit weight, compressive and tensile strength of the no-fines (NFC) as well as conventional concrete (CC). In addition, the effects of coarse aggregate size on the mechanical properties were also studied. Four gradations of uncrushed coarse aggregates ranging between (5.5-4.75) mm, (10-4.75) mm, (20-4.75) mm and (25-4.75) mm were used for preparing the concretes. The fixed cement-aggregate ratios of 1:6 (with w/c ratio=0.4) and 1:2:4 (with w/c ratio=0.5) were adopted for NFC and CC respectively. It was found that the gradation of uncrushed coarse aggregate has a significant effect on the mechanical properties of NFC. A maximum of 16% reduction in self-weight of the concrete without fines was obtained, as compared to that with fines. Moreover, the compressive strength of no-fines concrete significantly improved by replacing crushed with uncrushed coarse aggregate. The compressive strength increased by 16% for the batch of (25-4.75) mm.

A study on the behaviour of soil–geotextile systems in filtration tests

1996 ◽  
Vol 33 (6) ◽  
pp. 899-912 ◽  
Author(s):  
E M Palmeira ◽  
R J Fannin ◽  
Y P Vaid
Keyword(s):  
Particle Size ◽  
Soil Characteristics ◽  
Retention Capacity ◽  
Unidirectional Flow ◽  
Maximum Particle Size ◽  
Theoretical Predictions ◽  
New Apparatus ◽  
Maximum Particle ◽  
Gradient Ratio ◽  
Different Soils

The behaviour of soil–geotextile systems in filtration tests is reported for nonwoven geotextiles under unidirectional flow. A new apparatus was developed to preform filtration tests under an applied vertical stress, and tests were then conducted with different soils and nonwoven geotextiles in order to evaluate the clogging potential and retention capacity of these materials under rather severe combinations of geotextile and soil characteristics. Results show that the geotextiles perfomed well and that observed permeability losses were acceptable even for gradient ratios close to 3. No progressive piping was observed, and it is believed that the retention capacity of the geotextiles may be influenced by their manufacturing process. In general, theoretical predictions for the maximum particle size passing through the geotextile compared well with measurements. Key words: geotextiles, filtration, gradient ratio, permeability, soil retention, clogging.

Performance Evaluation of Al2O3 Powder Dispersion by Bead and Ball Mills

2014 ◽  
Vol 682 ◽  
pp. 32-34 ◽  
Author(s):  
N.S. Belousova ◽  
O.A. Goryaynova ◽  
E.V. Melnikova
Keyword(s):  
Particle Size ◽  
Performance Evaluation ◽  
Ball Mill ◽  
Aqueous Suspension ◽  
Ball Mills ◽  
Powder Dispersion ◽  
Maximum Particle Size ◽  
Bead Mill ◽  
Maximum Particle

In this paper the results of alumina aqueous suspension disaggregation with the help of bead and ball mills are shown. The changing of maximum particle size for50 wt. % and 90 wt. % of powder (from lowest to highest size) in suspension dispersed by a bead mill for one hour and ball mill for 48 hours was fixed. In order to achieve powder parameters given by the manufacturer disaggregating process sets was defined.

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