Effects of carbon nanotube dosage and aggregate size …
Cemented rockfill is composed of waste rock aggregate, cement paste and pores [11].Against its material composition and internal structure, various methods have been developed to improve its mechanical property [12].The first category is achieved by strengthening the matrix performance of cemented rockfill [13].It includes enhancing the bonding property of cement …
Research on influence laws of aggregate sizes on pore …
In this study, artificial sand with 5 different particle sizes was used as aggregate, and the synthetic gradation formed by their coupling was compared. The pore structure …
Effect of water content, bulk density, and aggregate size on mechanical …
Tensile strength increased with decreasing water content in all sizes of aggregates. It decreased with increasing aggregate size at a relative low water content (3.2–7.3 %), but increased with increasing aggregate size at a relative high water content (10.6–14.8 %). The effect of soil moisture on soil strength varied with soil states.
Fine Aggregates: Types, Properties & Uses in construction
Size: Coarse Sand: 2.0mm – 0.5mm: Medium sand: 0.5mm – 0.25mm: Fine sand: 0.25mm – 0.06mm: Silt: 0.06mm – 0.002mm: Clay <0.002: ... Irregularly nodular shaped sand is preferable to completely round grained sand. The shape of the aggregate plays a more important role in the coarse aggregate than in the fine aggregate.
Effects of recycled CRT glass fine aggregate size and …
Effects of recycled CRT glass fine aggregate size and content on mechanical and damping properties of concrete. March 2019; ... natural aggregate (sand with a fraction of 0–2), crushed aggregate ...
Fracture analysis of seawater sea-sand recycled aggregate …
Many researches have been conducted to study the mechanical properties of seawater sea-sand recycled aggregate concrete (SSRAC). Feng et al. observed the compressive properties of SSRAC, found that the seawater and sea-sand could improves the compressive strength and elastic modulus of recycled aggregate concrete [12].Xiao et al. analyzed the …
Influence of Aggregate Type and Size on Ductility and …
ECC is a micromechanically-based designed high-performance fiber-reinforced cementitious composite with high ductility and improved durability due to tight crack width. Standard ECC mixtures are typically produced with microsilica sand (200 μm [0.008 in.] maximum aggregate …
Mechanical properties and microscopic characterization of …
Water, cement, river sand and recycled aggregate of corresponding quality were weighed according to the test design. First, cement, river sand and recycled aggregate were poured into a pot for 60 s dry mixing until mixed evenly. Then, water was slowly added to the mixture for 20 s. Finally, wet mixing was conducted for 120 s.
(PDF) Effects of Particle Size Distribution of Standard Sands …
For this purpose, standardized sands of the same mineralogical origin were made with different particle size ranges, being: (i) standardized sand constituted by 25% of coarse and fine fractions ...
The use of treated desert sand in sustainable concrete: A mechanical …
This paper examines the impact of treated desert sand on the mechanical and microstructural properties of sustainable concrete. The results of this study reveal that the highest compressive strength was achieved with a 50% replacement level of treated desert sand. ... A crushed coarse aggregate with a maximum particle size of 20 mm was employed ...
Study on mechanical properties and corrosion damage …
This is consistent with the conclusion obtained in the previous text. Analysis of reasons: As shown in Fig. 1, the particle size distribution of river sand ranges from 0 to 4.75 mm, while the particle size distribution of mixed sand ranges from 0 to 1.18 mm. By replacing river sand with mixed sand as fine aggregate, the particle size ...
Research on influence laws of aggregate sizes on pore …
The differences in mortar aggregate gradation are manifested in aspects such as aggregate size and distribution [7], particle shape [8], particle roughness [9], and aggregate density [10], and so on. Main influencing mechanisms on pore structure are filling effect [11] particle arrangement [12] and ITZ formation [13].
Experimental and numerical investigation of multiscale mechanical …
Subsequently, the effect of aggregate type on the mechanical parameters of the concrete was investigated using a Split Hopkinson Pressure Bar (SHPB) system. ... is controlled within the range of 5–10 mm. The grain size distribution of coral sand, with a fineness modulus of 2.88, is illustrated in Fig. 2. The basic physical properties of both ...
Classification of Aggregate Based on Size and Shape
It is a coarse building material used in manufacturing concrete and mortar by mixingit with sand and cement. There are many types of aggregates like: 1. gravel 2. Slag 3. Recycled concrete 4. Crushed Stones The origin of aggregates is mainly from the rocks that can be igneous, metamorphic, and sedimentary. It has a signi…
Effect of Fine Aggregate Particle Size on Physical, Mechanical…
The compressive strength with aggregate size 0.5x0.5 without sieving, it closed to the initial plan of 27.72 MPa, whereas the highest compressive strength is for a mixed aggregate size of 1/1 and ...
Recycle of steel slag as cementitious material and fine aggregate …
Using steel slag (SS) as cementitious material and fine aggregate in concrete is an effective and environmental method for SS consumption and cost reduction. In this paper, SS was recycled in large volumes in concrete as partial cementitious material and fine aggregate. The compressive strength and reaction mechanism of cementitious material with different SS …
Influence of aggregate type and size on ductility …
Standard ECC mixtures are typically produced with microsilica sand (200 μm [0.008 in.] maximum aggregate size). In this study, ECC mixtures containing either crushed dolomitic limestone sand or...
Particle size distribution curve for fine aggregate (sand). C u
Particle size distribution curve for fine aggregate (sand). C u = 1.0/0.4 = 2.50< 3 (uniform) Coefficient of gradation (curvature) Cc = (D 30 ) 2 /D 60 *D 10 C c = 0.7 2 /1.0*0.4 = 1.23 lies ...
AASHTO M 43
This specification defines aggregate size designations and ranges in mechanical analyses for standard sizes of coarse aggregate and screenings for use in the construction …
The use of river sand for fine aggregate in UHPC and …
sands as well as micro silica sand were prepared for the fine aggregate in the mix design. The mean particle size of river sand was 0.23, 0.45, 0.89, 1.77 mm, respectively. In order to obtain the target size of river sand, normal river sand was classified by …
Understanding Aggregate Sieve Sizes: A Comprehensive Guide
What size is a No 4 sieve aggregate? A No 4 sieve aggregate size is 4.75mm. This is considered a coarse sieve size. What is sieve in aggregate? A sieve analysis in aggregate determines the distribution of particles by size within a given sample, allowing for compliance with design and production requirements.
Mechanical properties of recycled aggregate concrete …
For this reason, R1 specimens (Fig. 11 (a) and Fig. 12 (a)), which had a higher coarse aggregate - sand ratio, showed higher dynamic and static elasticity modulus. In both types of moduli, a descending trend with the increase in temperature was observed, and above 200 °C both moduli decreased 27 % in average every temperature step ...
Influence of recycled aggregates on long term mechanical properties and
The porosity of recycled aggregate concrete (RAC) is generally higher than that of natural aggregate concrete (NAC) due to the adhered mortar present in recycled aggregates [12].The porosity and the pore size distribution are the most important characteristics of the pore system of concrete which influence the ingress of foreign substances to the interior of concrete …
Shear Mechanical Behavior of Geogrid-Reinforced Calcareous Sands …
Ghanbari, and H. Mehdizadeh. 2016. "Experimental study on the behaviour of geogrid-reinforced slopes with respect to aggregate size." Geotext. ... L. Cheng, Q. Cheng, B. Liu, and B. Shi. 2022. "Coupling effect of biocementation-fiber reinforcement on mechanical behavior of calcareous sand for ocean engineering." Bull. Eng. Geol ...
Classification of Aggregates as per Size and Shape …
Following are the classification of aggregates based on size: Aggregates are classified into 2 types according to size. When the aggregate is sieved through a 4.75mm sieve, the aggregate passed through it called fine aggregate. Natural …
Physical, mechanical properties and microstructure of …
Concrete is a mixture of cementitious material, aggregate, and water. Aggregates are essential granular materials used in civil engineering (Přikryl, 2021).They represent70 % to 85 % of the weight of concrete (Langer, 2016).Aggregate consists of manufactured crushed stone and sand created by crushing bedrock, and naturally occurring unconsolidated sand and …
Aggregates for Concrete
mechanical device, printed, written, or oral, or recording for sound or visual reproduction ... 3.1.3—Maximum size and nominal maximum size 3.1.4—Significance of aggregate grading 3.1.5—Permissible variations in grading 3.2—Specific gravity (relative density) ... sieve is called "fine aggregate" or "sand," and larger aggregate
Study on mechanical properties and size effect of coal …
The conversion coefficient of size reflects the relationship between the standard size of concrete and the mechanical properties of non-standard-size specimens, such as compressive strength, which is an indirect manifestation of the effect of concrete size. The conversion coefficient between different sizes is shown in Eqs. (19), (20), (21).
Effect of Fine Aggregate Particle Size on Physical, Mechanical…
Ultra-high performance concrete (UHPC) mixtures are typically developed using fine aggregate with a maximum size of 600 μm. From a sustainability point of view, use of larger size fine aggregate particles in UHPC mixtures should be investigated to reduce labor costs associated with sieving, to reduce wastage of sand, and to improve sustainability. This …
Comparison of physical and mechanical properties of …
between 64-75% of aggregate mined each year is used for making concrete [3]. Natural sand has been conventionally used as fine aggregate in concrete. Natural sand possesses rounded or cubical particles with smooth surface texture which provide good workability in concrete [4]. Sand occupies around 35% volume in a concrete mix [5].