scholarly journals Characterisation of Fibre Reinforced Resin Concrete

2022 ◽  
Vol 58 (4) ◽  
pp. 158-170
Author(s):  
Kiruthika Chandrasekaran ◽  
Lavanya Prabha Srinivasan ◽  
Neelamegam Meyappan
Keyword(s):  
Mechanical Properties ◽  
Coarse Aggregate ◽  
Poisson Ratio ◽  
Preliminary Investigation ◽  
Aggregate Size ◽  
Cement Concrete ◽  
River Sand ◽  
Polyester Resins ◽  
Strain Behavior ◽  
Durability Properties

Resin Concrete uses polymeric resin to replace cement concrete. Four types of polyester resins were identified with Methyl methacrylate as catalyst, calcium carbonate and fly ash as fillers along with river sand and coarse aggregate size of 10mm, 6mm were used to produce resin concrete. Seventy-two trial batches were carried out for preliminary investigation targeting compressive strength of more than 80 MPa (11.6 ksi) and four batches were shortlisted. These four batches along with the addition of glass fiber were taken for detailed investigation of stress strain behavior, young�s modulus, Poisson ratio, various correlative equations among their mechanical properties and durability properties. Developed mix can be recommended for manufacturing various polymer products.

Analysis and optimization of mechanical properties of recycled concrete based on aggregate characteristics

2021 ◽  
Vol 28 (1) ◽  
pp. 516-527
Author(s):  
Jiangwei Bian ◽  
Wenbing Zhang ◽  
Zhenzhong Shen ◽  
Song Li ◽  
Zhanglan Chen
Keyword(s):  
Mechanical Properties ◽  
Elastic Modulus ◽  
Coarse Aggregate ◽  
Aggregate Size ◽  
Peak Stress ◽  
Recycled Concrete ◽  
Maximum Aggregate Size ◽  
Coarse Aggregates ◽  
Aggregate Content ◽  
Aggregate Shape

Abstract The most significant difference between recycled and natural concretes lies in aggregates. The performance of recycled coarse aggregates directly affects the characteristics of recycled concrete. Therefore, an in-depth study of aggregate characteristics is of great significance for improving the quality of recycled concrete. Based on the coarse aggregate content, maximum aggregate size, and aggregate shape, this study uses experiments, theoretical analysis, and numerical simulation to reveal the impact of aggregate characteristics on the mechanical properties of recycled concrete. In this study, we selected the coarse aggregate content, maximum aggregate size, and the aggregate shape as design variables to establish the regression equations of the peak stress and elastic modulus of recycled concrete using the response surface methodology. The results showed that the peak stress and elastic modulus of recycled concrete reach the best when the coarse aggregate content is 45%, the maximum coarse aggregate size is 16 mm, and the regular round coarse aggregates occupy 75%. Such results provide a theoretical basis for the resource utilization and engineering design of recycled aggregates.

scholarly journals Analysis of Petro-Physico-Mechanical Properties of Coarse Aggregate and Its Implications on the Performance Characteristics of Concrete

2020 ◽  
pp. 45-60
Author(s):  
Larry Pax Chegbeleh ◽  
Lawrence Opanin Nkansah ◽  
Frank Siaw Ackah ◽  
Richard Adams Mejida
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Coarse Aggregate ◽  
Aggregate Size ◽  
Performance Characteristics ◽  
Rock Samples ◽  
Rock Types ◽  
Strength Tests ◽  
Compressive Strength Of Concrete ◽  
The Impact

The importance of concrete as one of the major materials in the building and construction industry cannot be over emphasized due to the myriad benefits and versatility to humankind. However, its performance characteristics on the stability of engineered structures have mostly been overlooked. In this paper, petrographic characteristics and physico-mechanical properties of ten (n=10) rock samples and some quantity of coarse aggregate representing one set of samples, each obtained from two quarry sites around Amasaman and Shai Hills in the Greater Accra Region of Ghana, have been investigated. This study aimed to determine the impact of aggregate size, content and type on the compressive strength of concrete. The study was conducted through petrographic and physico-mechanical properties analyses on the samples obtained. Petrographic studies were performed on the ten (n=10) rock samples from each quarry site, while the physico-mechanical property tests were conducted directly on the coarse aggregate. However, compressive strength tests were performed on cast concretes produced from aggregates with varying sizes and type obtained from the two quarry sites. Results of the petrographic analysis reveal two rock types: Quartzo-feldspathic gneiss and Granodiorites from Amasaman quarry and also two rock types: Gneiss and Meta-granite from Shai Hills quarry. Results of the physico-mechical properties tests are consistent with requirement of approved construction standards. Compressive strength tests show increasing compressive strength of concretes with increasing aggregate nominal sizes of classes A, B and C but show reduced compressive strength for aggregate nominal sizes of class D. It can therefore, be inferred that, aggregate size and content have profound impact on compressive strength of concrete. Also, aggregate type has influence on compressive strength of concrete, as observed in higher compressive strength of concretes produced from the quartzo-feldspathic gneiss and granodiorites than concretes produced from the gneiss and meta-granites.

The Influence of the Coarse Aggregate Size on Mechanical Properties of Reinforced Concrete Beams

2012 ◽  
Vol 184-185 ◽  
pp. 696-700
Author(s):  
Hong Quan Sun ◽  
Jun Ding
Keyword(s):  
Mechanical Properties ◽  
Reinforced Concrete ◽  
Coarse Aggregate ◽  
Concrete Beams ◽  
Aggregate Size ◽  
Plane Section ◽  
Reinforced Concrete Beams ◽  
Static Loads ◽  
Small Aggregate ◽  
Normal Section

This paper gives the influence of the coarse aggregate size on the mechanical properties of the beam with different coarse aggregate sizes under static loads. In the research, three reinforced concrete beams with three different coarse aggregate sizes separately are tested. The stains and the deflections of the beams under the static loads are measured. The results show that under the action of the same loads, the maximum strains of the reinforced concrete beams with the big and the small aggregate size separately are larger than that of the beam with mixed aggregate size, and the deflection of the beam with the big aggregate size is larger than that of the beam with small aggregate size. In the loading process, the changes of the normal section strain of the reinforced concrete beams are satisfied the assumption of the plane section.

scholarly journals Effect of Size of Coarse Aggregate on Mechanical Properties of Metakaolin-Based Geopolymer Concrete and Ordinary Concrete

Materials ◽  
2021 ◽  
Vol 14 (12) ◽  
pp. 3316
Author(s):  
Hamed Fazli ◽  
Dongming Yan ◽  
Yajun Zhang ◽  
Qiang Zeng
Keyword(s):  
Mechanical Properties ◽  
Coarse Aggregate ◽  
Mercury Intrusion Porosimetry ◽  
Experimental Studies ◽  
Aggregate Size ◽  
Promising Alternative ◽  
X Ray ◽  
Ordinary Concrete ◽  
Eds Analysis ◽  
Geopolymer Binder

Geopolymer binders are a promising alternative to ordinary Portland cement (OPC) because they can significantly reduce CO2 emissions. However, to apply geopolymer in concrete, it is critical to understand the compatibility between the coarse aggregate and the geopolymer binder. Experimental studies were conducted to explore the effect of the size of the coarse aggregate on the mechanical properties and microstructure of a metakaolin-based geopolymer (MKGP) concrete and ordinary concrete. Three coarse aggregate size grades (5–10 mm, 10–16 mm, and 16–20 mm) were adopted to prepare the specimens. The microstructure of the concretes was investigated with scanning electron microscopy/energy-dispersive X-ray spectroscopy (SEM/EDS) and mercury intrusion porosimetry (MIP). Results showed an opposite coarse aggregate size effect between OPC and MKGP specimens in terms of compressive strength. SEM/EDS analysis indicated that the MKGP concrete has a weaker microstructure compared to OPC concrete induced by a higher porosity. The differences in mechanical properties and pore structure between the MKGP and OPC concrete are attributed to the greatly differing shrinkages triggered by the large surface area and penny-shaped particles of metakaolin. The findings in this work help tailor the mechanical properties and microstructure of MKGP concrete for future engineering applications.

scholarly journals Strength and durability properties of waste steel slag mixed concrete

2021 ◽  
Vol 42 (1) ◽  
Author(s):  
Abhijit Warudkar ◽  
S. Elavenil
Keyword(s):  
Coarse Aggregate ◽  
Steel Slag ◽  
Construction Materials ◽  
Weather Conditions ◽  
Cement Concrete ◽  
Durability Properties ◽  
Natural Aggregates ◽  
External Forces ◽  
Strength And Durability ◽  
Steel Industries

The exploration of natural aggregates for construction leads to the degradation of the environment; thus, the development of environment-friendly construction materials, such as steel slag, is being promoted. Disposal of steel slag without affecting ecology is the central issue of concern, as steel industries produce a million tonnes of steel slags as a by-product every year. To address this issue, we studied the potential of a waste steel slag to use as a replacement of coarse aggregate in the cement concrete. We observed that the mixing of waste steel slag with concrete improves the mechanical and durability properties of the concrete. The abrasion properties of steel slag concrete are comparable with a coarse aggregate concrete. The study concludes that the use of steel slag in concrete improves the physical properties of the cement concrete, and thus, steel slag concrete can be used for building floorings, pavements, or concrete surfaces, which expose to the external forces and severe weather conditions.

scholarly journals Predicting the Mechanical Properties of Concrete Using Intelligent Techniques to Reduce CO2 Emissions

2019 ◽  
Vol 69 (334) ◽  
pp. 190 ◽  
Author(s):  
H. H. Ghayeb ◽  
H. A. Razak ◽  
N.H. R. Sulong ◽  
A. N. Hanoon ◽  
F. Abutaha ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Co2 Emissions ◽  
Coarse Aggregate ◽  
Experimental Results ◽  
Engineering Properties ◽  
Type I ◽  
Fine Aggregate ◽  
River Sand ◽  
Chemical Admixtures ◽  
Concrete Production

The contribution to global CO2 emissions from concrete production is increasing. In this paper, the effect of concrete mix constituents on the properties of concrete and CO2 emissions was investigated. The tested materials used 47 mixtures, consisting of ordinary Portland cement (OPC) type I, coarse aggregate, river sand and chemical admixtures. Response surface methodology (RSM) and particle swarm optimisation (PSO) algorithms were employed to evaluate the mix constituents at different levels simultaneously. Quadratic and line models were produced to fit the experimental results. Based on these models, the concrete mixture necessary to achieve optimum engineering properties was found using RSM and PSO. The resulting mixture required to obtain the desired mechanical properties for concrete was 1.10-2.00 fine aggregate/cement, 1.90-2.90 coarse aggregate/cement, 0.30-0.4 water/cement, and 0.01-0.013 chemical admixtures/cement. Both methods had over 94% accuracy, compared to the experimental results. Finally, by employing RSM and PSO methods, the number of experimental mixtures tested could be reduced, saving time and money, as well as decreasing CO2 emissions.

scholarly journals Periwinkle Shell as Mixing Ingredient in Concrete: A Review

CONSTRUCTION ◽  
2021 ◽  
Vol 1 (2) ◽  
pp. 21-30
Author(s):  
HANIS NADIAH RUSLAN ◽  
Khairunisa Muthusamy ◽  
Sharifah Maszura Syed Mohsin ◽  
M. S. Kirgiz
Keyword(s):  
Mechanical Properties ◽  
Natural Resources ◽  
Environmental Pollution ◽  
Coarse Aggregate ◽  
Cement Replacement ◽  
Durability Properties ◽  
Natural Aggregate ◽  
Concrete Materials ◽  
Periwinkle Shell ◽  
Growing Population

Growing population which also pushes for rising demand for seafood results in a generation of seashells which are thrown as environmental pollution waste after the edible meat is consumed. Meanwhile, the utilisation of natural resources as mixing ingredients for the production of concrete materials continues to increase over the year. The use of periwinkle shells as mixing ingredients in concrete materials can lower the dependency on natural aggregate supply. This paper discusses the properties of periwinkle shell and method of treatment prior to their usage as a cement and coarse aggregate as well as the mechanical properties of concrete produced using this seashell waste. Overall, the replacement of periwinkle shell as cement and coarse aggregate must be integrated in a specified percentage to enhance the performance of the concrete. For cement replacement, 5% of replacement gives the highest strength, meanwhile 10% of replacement as coarse aggregate can meet the desired strength. The increase in the use of periwinkle shell quantity as cement or coarse aggregate replacement reduces concrete workaibility. The integration of periwinkle shell influences the compresssive strength of concrete. Accomplishment in replacing periwinkle shell as cement and coarse aggregate would reduce pollutiion due to shell dumping and save natural resources. However, further investigation in terms of durability properties is recommended.

scholarly journals Mechanical Properties of Concrete with Substitution of Fine and Coarse Aggregate by Waste Materials in Concrete

2019 ◽  
Vol 8 (4) ◽  
pp. 5817-5820
Keyword(s):  
Mechanical Properties ◽  
Coarse Aggregate ◽  
Construction Materials ◽  
Copper Slag ◽  
Waste Materials ◽  
Partial Replacement ◽  
Fine Aggregate ◽  
River Sand ◽  
Aggregate Concrete ◽  
Concrete Mixtures

Paper Construction industry has been conducted various studies on the utilization of waste materials in concrete productions in order to decrease the usage of natural resources. This research paper exhibits the evaluation and the effective reuse of waste construction materials and industries, such as cuddapah waste aggregate as partial replacement of conventional coarse aggregate and copper slag as partial replacement of river sand (fine aggregate). Experiments were conducted to find out the mechanical properties of concrete such as compressive, splitting tensile, flexural strengths and the modulus of elasticity of concrete for waste materials aggregate concrete and to compare them with those of conventional aggregate concrete. Results appear that waste materials in concrete have the potential to produce good quality concrete mixtures.

scholarly journals THE INFLUENCE OF DOSAGE AND PRODUCTION PROCESS ON THE PHYSICAL AND MECHANICAL PROPERTIES OF AIR LIME MORTARS

2020 ◽  
Vol XLIV-M-1-2020 ◽  
pp. 351-356
Author(s):  
L. Garijo ◽  
X. X. Zhang ◽  
G. Ruiz ◽  
J. J. Ortega
Keyword(s):  
Mechanical Properties ◽  
Production Process ◽  
Free Water ◽  
Aggregate Size ◽  
Physical And Mechanical Properties ◽  
River Sand ◽  
Curing Conditions ◽  
Factors Affecting ◽  
Lime Mortars ◽  
The Matrix

Abstract. This paper studies the influence of five different factors affecting the dosage and production process of seven types of air lime mortars on their physical and mechanical properties. Such factors comprise the water/lime ratio, the aggregate type and size, the material of the mold and the curing conditions. Moreover, some physical and mechanical properties, not usually measured on air lime mortars, are obtained, such as open porosity, splitting tensile strength, fracture energy and elastic modulus measured through prisms. The results show that under the three different water/lime ratios tested, the material experiences a structural weakening. Ambient curing conditions were more favorable for air lime mortars than high humid ones. Moreover, it is observed that fabrication with wooden molds provided higher mechanical properties as they absorbed the free water, although this effect was probably local. Air lime mortar with an aggregate size of 2 mm had lower consistency in a fresh state as finer sands were more water demanding and the mechanical properties of this mortar were slightly lower than those of mortar with aggregate sizes of 0/4 mm. Furthermore, using limestone aggregates improved the continuity between the lime and the matrix. This fact resulted in higher mechanical properties of the mortars with limestone aggregates in comparison to those with river sand when maintaining the same water/lime ratios. This study can suppose a further step in the improvement of the dosage methodology of air lime mortars.

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