scholarly journals Influence of the surface treatment of tire rubber residues added in mortars

2008 ◽  
Vol 1 (2) ◽  
pp. 113-120 ◽  
Author(s):  
A. C. Marques ◽  
J. L. Akasaki ◽  
A. P. M. Trigo ◽  
M. L. Marques
Keyword(s):  
Mechanical Properties ◽  
Aqueous Solution ◽  
Tensile Strength ◽  
Compressive Strength ◽  
Surface Treatment ◽  
Water Absorption ◽  
Modulus Of Elasticity ◽  
Tire Rubber ◽  
Flow Test ◽  
Made In

In this work it was evaluated the influence tire rubber addition in mortars in order to replace part of the sand (12% by volume). It was also intended to verify if the tire rubber treatment with NaOH saturated aqueous solution causes interference on the mechanical properties of the mixture. Compressive strength, splitting tensile strength, water absorption, modulus of elasticity, and flow test were made in specimens of 5cmx10cm and the tests were carried out to 7, 28, 56, 90, and 180 days. The results show reduction on mechanical properties values after addition of tire rubber and decrease of the workability. It was also observed that the tire rubber treatment does not cause any alteration on the results compared to the rubber without treatment.

The Recycled Aggregates with Surface Treatment by Pozzolanics

2005 ◽  
Vol 287 ◽  
pp. 63-68 ◽  
Author(s):  
Jae Jun Kim ◽  
Sang Heum Youn ◽  
M.J. Cho ◽  
H.T. Shin ◽  
Jeong Bae Yoon ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Surface Treatment ◽  
Water Absorption ◽  
Recycled Aggregates ◽  
Scanning Electron Micrographs ◽  
Cement Mortars ◽  
Pozzolanic Materials ◽  
Adsorption Treatment ◽  
Scanning Electron

To improve the mechanical properties of concretes containing recycled aggregates, pozzolanic materials were used to decrease the porosity of the recycled aggregates. These pozzolanic materials were adhered on the surface of recycled aggregates and closed the open pores so that the water absorption was decreased 1~2% as the amount of adsorption was increased. Compressive strength of cement mortars and concretes using surface treated recycled aggregates reaches above 95% of the strength of its natural counterparts. Investigation of the microstructures using the scanning electron micrographs showed the formation of dense interface after the adsorption treatment of pozzolanics to recycled aggregates.

Fracture Mechanical Properties of Rocks and Mortar/Rock Interfaces

1994 ◽  
Vol 370 ◽  
Author(s):  
Manouchehr Hassanzadeh
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Compressive Strength ◽  
Fracture Energy ◽  
Modulus Of Elasticity ◽  
Splitting Tensile Strength ◽  
Coarse Grained ◽  
Interfacial Zone ◽  
Test Results

AbstractThis study has determined the fracture mechanical properties of 9 types of rock, namely fine-, medium- and coarse-grained granites, gneiss, quartzite, diabase, gabbro, and fine- and coarse-grained limestones. Test results show among other things that quartzite has the highest compressive strength and fracture energy, while diabase has the highest splitting tensile strength and modulus of elasticity. Furthermore, the strength and fracture energy of the interfacial zone between the rocks and 6 different mortars have been determined. The results showed that, in this investigation, the mortar/rock interfaces are in most cases weaker than both mortars and rocks.

An Experimental Study on Evaluation of Mechanical Properties in High Performance Concrete Using Admixture

2013 ◽  
Vol 372 ◽  
pp. 231-234
Author(s):  
Jeong Eun Kim ◽  
Wan Shin Park ◽  
Nam Yong Eom ◽  
Sun Woong Kim ◽  
Do Gyeum Kim ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Compressive Strength ◽  
Silica Fume ◽  
Modulus Of Elasticity ◽  
High Performance ◽  
High Performance Concrete ◽  
Splitting Tensile Strength ◽  
Experimental Investigations ◽  
Binder Ratio

In this study, some experimental investigations on the development of mechanical properties with age of high performance concrete (HPC) incorporated with blast furnace slag with fly ash or silica fume have been reported. Four different blended HPC were prepared in 0.40 water-binder ratio. At every four mixtures, the compressive strength, splitting tensile strength and modulus of elasticity at 7 and 28 days have been observed for HPC developments. Consequently, only replacement of silica fume significantly increases the mechanical properties in terms of compressive strength, splitting tensile strength and modulus of elasticity.

The Effect of Pozzolanics on the Recycled Aggregates by Surface Treatment

2005 ◽  
Vol 486-487 ◽  
pp. 305-308 ◽  
Author(s):  
Jae Jun Kim ◽  
Sang Heum Youn ◽  
M.J. Cho ◽  
H.T. Shin ◽  
Jeong Bae Yoon ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Surface Treatment ◽  
Water Absorption ◽  
Silica Fume ◽  
Recycled Aggregates ◽  
Cement Mortars ◽  
Pozzolanic Materials ◽  
Adsorption Treatment

To improve the mechanical properties of concretes containing recycled aggregates, pozzolanic materials such as Silica Fume and Meta Kaolin were used to decrease the porosity of the recycled aggregates. These pozzolanic aterials were adhered on the surface of recycled aggregates and closed the open pores so that the water absorption was decreased 1~2% as the amount of adsorption was increased. Compressive strength of cement mortars and concretes using surface treated recycled aggregates reached above 95% of the strength of its natural counterparts. Investigation of the microstructures using the scanning lectron micrographs showed the formation of dense interface after the adsorption treatment of pozzolanics to recycled aggregates.

scholarly journals Modifikasi Resipren dan Bitumen Dalam Peningkatan Kekuatan Aspal

2019 ◽  
Vol 2 (1) ◽  
pp. 129-134
Author(s):  
Fitri Ikova M ◽  
Tamrin Tamrin ◽  
Darwin Yunus Nasution
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Thermal Properties ◽  
Water Absorption ◽  
Produced Water ◽  
Asphalt Mixture ◽  
Fine Sand ◽  
Maximum Compressive Strength ◽  
Coarse Gravel ◽  
Made In

Modifikasi Resipren dan Bitumen dalam Peningkatan Kekuatan Aspal telah dilakukan. Aspal modifier dibuat dalam 7 jenis variasi perbandingan aspal, bitumen, dengan resipren yang telah dilarutkan dengan toluene sebesar 75:20:5 ; 70:20:10 ; 65:20:15 ; 60:20:20 ; 55:20:25 (v/v/b) dalam 100 mL, penambahan agregat pasir halus 300 gram dan agregat kasar kerikil 50 gram, dan diproses dalam ekstruder pada suhu 150oC. Sifat mekanik dan sifat termal aspal modifier yang diuji meliputi kuat tekan, daya serap air, morfologi dengan TEM. Hasil karakterisasi menunjukkan bahwa campuran aspal, bitumen, dan resipren dengan perbandingan 55 : 20 : 25 efektif dalam meningkatkan sifat mekanis dari campuran aspal dimana dihasilkan kekuatan tekan maksimum sebesar 0,974 mPa. Sifat fisik menghasilkan penyerapan air sebesar 0,63%. Hasil uji morfologi dengan TEM memperlihatkan adanya perbedaan setelah bitumen ditambahkan kedalam campuran aspal dan resipren.   Recipient and bitumen modifications in asphalt strengthening had been carried out. Asphalt modifier was made in 7 types of comparison of asphalt, bitumen variation, with recipient (dissolved with toluene by 75: 20: 5; 70:20:10; 65:20:15; 60:20:20; 55:20:25 (v/v/b) in 100 mL), 300 grams of fine sand aggregate and 50 grams of coarse gravel aggregate; then processed in an extruder at 150oC. The mechanical properties and thermal properties of the modifier test included compressive strength, water absorption, and morphology with TEM. The characterization results showed that asphalt, bitumen and recipient mixtures with a ratio of 55: 20: 25 were effective in increasing the mechanical properties of the asphalt mixture where the maximum compressive strength was 0.974 mPa. Physical properties produced water absorption of 0.63%. The results of morphological tests with TEM showed that there was a difference after bitumen was added to the asphalt and recipient mixture.

scholarly journals Effect of Wollastonite Mineral on Fresh and Mechanical Properties of Concrete

2021 ◽  
Vol 9 (10) ◽  
pp. 496-500
Author(s):  
Aman Sharma
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Compressive Strength ◽  
Silica Sand ◽  
Concrete Technology ◽  
Split Tensile Strength ◽  
Durability Properties ◽  
Good Improvement ◽  
Strength And Durability ◽  
Made In

Abstract: The wollastonite mineral are the main source of solid-state reaction from limestone and silica sand. Wollastonite is used as replacement of both sand and cement depending on size of wollastonite. Present study will provide better understanding of mechanical and durability properties of concrete in which cement is partially replaced with wollastonite. The present paper would contribute to the efforts being made in the field of concrete technology towards development of concretes possessing good strength and durability properties along with economic and ecological advantage. Based on the study, valuable advice will be given for concrete structures. It was found that with increase in amount of wollastonite, in concrete with workability of concrete decreases. It was also found that initial day’s strength is less for wollastonite concrete compare to control mix, but as the age increases they show good improvement in strength due to pozzalanic reaction. Optimum dosage is observed to be 15% WP which shows more strength compared to control mix. Keywords: wollastonite mineral, workability, compressive strength, split tensile strength.

scholarly journals Effect of Ading Nanocarbon Black on the Mechanical Properties of Epoxy

2014 ◽  
Vol 7 (1) ◽  
pp. 94-108
Author(s):  
Amer Hameed Majeed ◽  
Mohammed S. Hamza ◽  
Hayder Raheem Kareem
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Compressive Strength ◽  
Impact Strength ◽  
Flexural Strength ◽  
Carbon Black ◽  
Modulus Of Elasticity ◽  
Tensile Modulus ◽  
Dispersion Method ◽  
Carbon Black Nanoparticles

The study covers the effect of nanocarbon black particles (N220) on some important mechanical properties of epoxy reinforced with it [carbon black nanoparticles]. The nanocomposites were prepared with (1 to 10 wt. %) of carbon black nanoparticles using ultrasonic wave bath machine dispersion method. The results had shown that the tensile strength , tensile modulus of elasticity, flexural strength and impact strength are improved by (24.02%,7.93%,17.3% and 6% ) respectively at 2wt % .The compressive strength and hardness are improved by (44.4%, 12%) at 4wt%.

Effect of white soil substitution on fly ash based mortar geopolymers with sodium hydroxide activator

2020 ◽  
Vol 26 (1) ◽  
pp. 9-16
Author(s):  
Yulita Arni Priastiwi ◽  
Arif Hidayat ◽  
Dwi Daryanto ◽  
Zidny Salamsyah Badru
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Fly Ash ◽  
Moisture Content ◽  
Sodium Hydroxide ◽  
Modulus Of Elasticity ◽  
Physical And Mechanical Properties ◽  
Test Results ◽  
Alkaline Activator ◽  
Made In

The presence of white soil in a geopolymer mortar affects the physical and mechanical properties of the mortar itself, especially in compressive strength, density and modulus of elasticity produced. Geopolymer mortar composed of fly ash, sand, water, and NaOH which acts as an alkaline activator compared to mortar from the same material, but white soil from Kupang is added as a substitution of fly ash. Specimens are made in six variations. Geopolymer mortar composers using a ratio of 1 binder: 3 sand with w/b of 0.5. Binder composed of fly ash with white soil substitution of 0; 5; 10; 15; 20 and 30% by weight of fly ash. An activator NaOH 8M solution was added to the mixture. Both white soil and fly ash pass of sieve no. 200 with a moisture content of 0%. Mortar made measuring 5x5x5 cm. The mortar was treated by the oven of method at 60 oC for 24 hours until the mortar does not change in weight. The test results show geopolymer mortar with 15% substitution of white soil to fly ash has the highest compressive strength, density and modulus of elasticity among other variations. In all mortar variations, compressive strength at 14 days has reached 75% of strength at 28 days.

scholarly journals Temperature Effect on Mechanical Properties and Damage Identification of Concrete Structure

2014 ◽  
Vol 2014 ◽  
pp. 1-10 ◽  
Author(s):  
Yubo Jiao ◽  
Hanbing Liu ◽  
Xianqiang Wang ◽  
Yuwei Zhang ◽  
Guobao Luo ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Compressive Strength ◽  
Temperature Effect ◽  
Modulus Of Elasticity ◽  
Damage Identification ◽  
Coupling Effect ◽  
Concrete Slab ◽  
Splitting Tensile Strength ◽  
Effect Of Temperature

Static and dynamic mechanical properties of concrete are affected by temperature effect in practice. Therefore, it is necessary to investigate the corresponding influence law and mechanism. This paper demonstrates the variation of mechanical properties of concrete at temperatures from −20°C to 60°C. Temperature effects on cube compressive strength, splitting tensile strength, prism compressive strength, modulus of elasticity, and frequency are conducted and discussed. The results indicate that static mechanical properties such as compressive strength (cube and prism), splitting tensile strength, and modulus of elasticity have highly linear negative correlation with temperature; this law is also applied to the first order frequency of concrete slab. The coupling effect of temperature and damage on change rate of frequency reveals that temperature effect cannot be ignored in damage identification of structure. Mechanism analysis shows that variation of elastic modulus of concrete caused by temperature is the primary reason for the change of frequency.

scholarly journals Self-Compacting Concrete Incorporating Micro-SiO2and Acrylic Polymer

2014 ◽  
Vol 2014 ◽  
pp. 1-6 ◽  
Author(s):  
Ali Heidari ◽  
Marzieh Zabihi
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Water Absorption ◽  
Self Compacting Concrete ◽  
Acrylic Polymer ◽  
Significant Negative Effect ◽  
Negative Effect ◽  
Made In

This study examined the effects of using acrylic polymer and micro-SiO2in self-compacting concrete (SCC). Using these materials in SCC improves the characteristics of the concrete. Self-compacting samples with 1-2% of a polymer and 10% micro-SiO2were made. In all cases, compressive strength, water absorption, and self-compacting tests were done. The results show that adding acrylic polymer and micro-SiO2does not have a significant negative effect on the mechanical properties of self-compacting concrete. In addition using these materials leads to improving them.

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