Some Mechanical Properties of Polymer Modified Concrete by Adding Waste Iron Filings and Chips

The study aims to improve some mechanical properties like compressive strength, tensile strength, modulus of elasticity and flexural strength of polymer modified concrete (PMC). This improving for PMC done by using waste iron filling as replacement from fine aggregate. waste iron filings and chips used in this research as percentages from sand ranged from 0 % to 40 % , the compressive strength of ordinary polymer concrete increase from 32.2 MPa to 41.81 MPa by 40% replacement of sand with waste iron filings and chips, tensile strength increased also from 2.83 MPa to 4.23 MPa by 40% replacement also. Flexural strength increased from 3.7 MPa for reference mix to about 7.1 MPa for mixes with 40% replacement, modulus of elasticity increased from 21087 MPa to 25233 MPa by using maximum percentage of waste iron filings. There is a slight increment in mechanical properties of polymer modified concrete after 30% ratio of waste iron filings and chips. Also research includes mixes modified with larger dosage of super plasticizer and less water/cement ratio to improve mechanical properties of PMC.

Reducing the Effect of Air Pollution due to Cement Production by Using Low Cement Content Concrete with same or more Efficiency with Normal Concrete

The research aims to decrease the effect of air pollution due to CO2 pollution that liberates during the manufacturing of cement and that can be done by using less cement content in concrete without decreasing the strength of concrete. also reducing cement in concrete leads to less cost of construction and easy work in casting and finishing in concrete works due to using super-plasticizer that makes mixes with high workability and not needs any compaction in construction .the study show higher values of compressive and flexural strength of concrete with low cement content obtained by using CF super-plasticizer admixture .250 kg/1 cubic meter concrete with CF admixture gave more improvement in compressive strength compared with 350 cement content, also 400 cement content gave more results in compressive and flexural strength compared with ordinary concrete with 550 cement content.

PENGARUH PENAMBAHAN SUPER PLASTICIZER KEDALAM CAMPURAN BETON TERHADAP KUAT TEKAN BETON K-400 PADA UMUR 28 HARI

Superplasticizer merupakan salah satu bahan additive yang sering digunakan untuk mempermudah pengerjaan beton (workability). Penggunaan superplasticizer dengan jumlah tertentu dapat meningkatkan mutu beton, sebagai akibat adanya pengurangan pemakaian air sehingga faktor air semen menjadi lebih rendah dengan slump yang meningkat. Penelitian ini dilakukan pada Laboratorium PT. Perkasa Adiguna Sembada selama 3 bulan. Berdasarkan hasil penelitian dan analisis data didapatkan hasil bahwa penggunaan Superplasticizer sebagai bahan tambah sangat mempengaruhi hasil kuat tekan beton dengan kekuatan tinggi, di mana kuat tekan beton normal 28 hari mendapatkan hasil 412,5 kg/cm2. Pada penambahan superplasticizer 3% pada umur 28 hari mendapatkan nilai optimum sebesar 452,6 kg/cm2. Jadi Superplasticizer sangat berpengaruh terhadap kuat tekan beton. Kata kunci: Kuat tekan beton, Mutu K-400, Superplasticizer

Review on Strengthening the Characteristics of Concrete Using Oil Coated Coconut Fibre

Sustainability is a widely acknowledged concept in modern day construction scenario. Although the construction industry is transforming in a substantial way in terms of the material used and the equipment used, the construction cost has risen steeply along with the worse impact on the environment due to this it has resulted in the acceptance of method like the use of natural fiber for example Coconut fibre for improving the strength of concrete. Coconut fiber is easily and widely available in abundance, which makes it fairly sustainable as form of reinforcement material in concrete. The use of coconut fibre as in form of reinforcement has also emerged as new source of income for the coconut producer. In addition, it can also be seen as a new effective way for the discarding of coir mattress wastage. The major problem of coconut fibre i.e. high water absorption rate of the fibre can be reduced to certain extent by coating the fibres with appropriate oil. In addition to this, the fibres which are naturally occurring is also ecologically sustainable and can lower the global carbon track effectively. This study aims to analyse the difference in strength of coconut fibre (processed fibres coated with oil and oil raw fibres coated with oil) reinforced concrete at various fibre contents and to collate it with the traditional concrete. The different strength aspects which are analysed in this study are the tensile, compressive and flexural strength of the concrete reinforced with coconut fibre at different percentages like 4%, 5% & 6% by the weight of cement of fibre. The optimum percentage of the raw fibre meshes and processed fibre were found and the optimum percentage of super-plasticizer required for the desired workability was also examined.

Effect of Nano Silica on Mechanical Properties of High Strength Concrete of M60 Grade

In the present study High Strength Concrete of M60 grade was designed by using Cement, Fly ash, Fine Aggregate, Coarse Aggregate, Water and Super Plasticizer following IS 10262-2009 and IS 456-2000. In the above mix cement was replaced partially with Nano Silica by varying percentages by weight (1%, 2%, 3% and 4%) and the effect of nano silica on the strength behaviour was studies. The Compressive, Flexural and Tensile strengths of the concrete were determined at 7, 14, 28 and 56 days and the results were compared.

Cement-Based Materials Modified with Nanoscale Additives

The most common and reliable material without which modern construction is indispensable is concrete. The development of construction production is pushing for new solutions to improve the quality of concrete mix and concrete. The most demanded and significant indicators of a concrete mixture are the compressive strength and mobility of the concrete mixture. Every year, the volume of research on nanomaterials as modifying components of concrete is significantly increasing, and the results indicate the prospects for their use. Nanoparticles with a large specific surface are distinguished by chemical activity, can accelerate hydration and increase strength characteristics due to nucleation and subsequent formation of C–S–H and compaction of the material microstructure. Sol of nanosilica, which can be used instead of microsilica from industrial enterprises, and carbon nanomaterial have a wide reproduction base. This paper presents studies of these types of nanomaterials and the results of their application in cement concrete. Studies have shown that the effect is also observed with the introduction of an additive containing only one type of nanoparticles. The dependence of the obtained characteristics of cement concretes on the content of these nanomaterials has been established. It has been found that the best results were obtained with an additive in which the above-mentioned nanomaterials were used together. Compressive strength of heavy concrete samples, improved by the complex nanodispersed system, was 78.7 MPa, which exceeds the strength of the sample containing the CNT additive in a pair with a super-plasticizer by 37 %. The paper proposes the mechanism for action of the presented complex additive.

An Experimental Investigation on High Strength Binary Blended Polymer Hybrid Concrete using polycarboxylate Super Plasticizer

Concrete the arena’s most consumed material after water on the earth planet. Concrete is the cloth that's stated to be sturdy in compression and susceptible within the tension. Steel is the ductile fabric to resist anxiety in the concrete. Cement is the non-acidic and alkaline which save you the metal from corrosion. The most important attention on this experimental take a look at inside the beyond is made to make concrete strong in tension with less use of metal and with using a few replacements. The Steel crimped fibres are said for use to enhance the homes of concrete that have the improvement to the age factor of concrete. The use of Polypropylene fibres to enhance the flexural assets inside the concrete. Past Experimental research with the aid of part of the past researchers. The use of polycarboxylate amazing plasticizers to enhancethe workability and to lessen the water percentage material with in the concrete along with improve the compressive electricity with the emphases at the specific properties of concrete to triumph over the special botheration in concrete. Concrete has been serious trouble manifest in now every day so we want to find out the arrangement of this difficulty. In this undertaking to be middle around attributes best of solid evaluation of cement with various corresponding of supplanting of concrete with and we along with pleated metallic fibre. To utilising metal fibre, improve the flexural pleasant of cement in diverse range mixture. The solid of blend to be casted with metallic fibre and without metal fibre in vary costs 0.8% 1.8% 2.8% and 3.8%. To trust the cost of improvement to be examines. The 3-d squares and chamber have been tried for both split malleable (150 mm width and 300 mm period chambers) and compressive excellent 3-D shape. At final, the high-quality presentation of blended fibre concrete is contrasted and the exhibition of commonplace cement

A review on study of partial replacement of cement by metakaolin and glenium b233 in self- compacting concrete.

Self-compacting concrete (SCC) refers to high strength concrete which will compact under its own weight and does not require external vibration. This paper gives a review on the journals to study the effect of metakaoiln in SCC. The metakaolin is used as a replacement of cement and it is obtained from natural Kaolin clay. Metakaolin helps to increase the compressive strength, spilt tensile strength, flexural strength and also the fresh properties. The use super plasticizer greatly improves pump-ability and the slump value. GLENIUM B233 is a new generation based super plasticizer which is based on modified polycarboxylic ether. The fresh properties such as pump ability and workability and the durability properties of super plasticizer in SCC with metakaolin are discussed. Keywords: Self-Compacting Concrete, Metakaolin, GLENIUM B233, Superplasticizer, Polycarboxylic Ether

Development of Ultra High Strength Concrete Using Silica Fume and its Mechanical & Durability Properties - Experimental Investigation

This experimental investigation is aimed to develop an ultra-high strength concrete with minimum of 100 MPa as compressive strength.In order to obtain this, twenty different concrete mixes have been tried, using cement, river sand, coarse aggregate, water, silica fume and super plasticizer. During the preparation of trial mixes of concrete, the water / binder ratio of 0.2, silica fume of 10% to the weight of cement, super plasticizer of 10 litres per cubic metre of concrete and coarse aggregate of 1000 kg/m3 were kept as constant. The amount of cement content (as 600-, 650-, 700-, 750- and 800 kg/m3) and the fine aggregate content (as 500-, 600-, 700- and 800 kg/m3) was varied. Totally 300 specimens were cast and tested in this investigation.The100 x 100 x 100 mm size of cubes, 150 x 300 mm size of cylinders, 100 x 100 x 500 mm size of prisms, 100 x 200 mm size of cylinders, 60 x 100 mm size of cylinders were used to test compressive, split tensile, flexural strength, chloride penetration and water penetration tests respectively at the age of 7-, 14- and 28 days. Based on the test results, a suitable mix proportion to produce an ultra-high strength concrete has been identified. Subsequently, from this investigation, the maximum cube compressive strength of 130 MPa, split tensile strength of 6.94 MPa, flexural strength of 21.39 MPa, chloride penetration 36 Coulombs which is lesser than 100 and sorptivity coefficient valueof 0.582 has been achieved.