scholarly journals Enhancement of Mechanical Properties of Lightweight Foamed Concrete using Fibermesh

2019 ◽  
Vol 8 (2S2) ◽  
pp. 234-242
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Tensile Test ◽  
Concrete Strength ◽  
Experimental Tests ◽  
Strength Test ◽  
Water To Cement Ratio ◽  
Compressive Strength Test ◽  
Foamed Concrete ◽  
Splitting Tensile Test

Foamed concrete is one of the lightweight concretes that has been investigated widely due to its potential use as a building element as well as due to its benefits, which are low in self weight, more durable, self-compacting and has excellent thermal insulation properties. The major limitation of this material is because of its characteristics which are weak in tension and suffers high shrinkage. Therefore, the introduction of fiber in foamed concrete becomes a popular research focus among researchers in conducting a study since it can aid in overcoming this problem. Thus, this research was performed to investigate the mechanical properties of foamed concrete with the enclosure of fibermesh. Fibermesh with a size of 160g weight per square meter was examined on three densities of foamed concrete (800kg/m3, 1100kg/m3, 1400 kg/m3). The cement-sand used in this study was constantly maintained at 1:1.5 and the water to cement ratio was fixed at 0.45. Moreover, this study also explored the improvement of foamed concrete strength from without any addition of fiber (control) to 1, 2, and 3 layer(s) of fibermesh enclosure. There were three experimental tests conducted to determine the foamed concrete strength which are compressive strength test, flexural test, and splitting tensile test. The experimental results showed that, foamed concrete gave the highest strength results at a density of 1400kg/m3 with the \ enclosure of 3 layers of fibermesh while the lowest strength was attained at 800kg/m3 density with no addition of fiber (control specimen). The positive improvement in foamed concrete strength obviously showed after enclosure of fibermesh compared to the plain foamed concrete, where at density of 1400kg/m3 with 3 layers enclosure of fibermesh, 96% of changes was recorded in the compressive strength test while 332% was shown in the flexural strength test and 421% was recorded in the splitting tensile test.

Experiment and Mechanism Study on Effect of Water/Binder and Fly Ash on Mechanical Properties of HPC

2011 ◽  
Vol 255-260 ◽  
pp. 3404-3410
Author(s):  
Shuang Xi Li ◽  
An Quan Xu ◽  
Xin Jun Tang ◽  
Quan Hu
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Fly Ash ◽  
Concrete Strength ◽  
Early Period ◽  
Point Of View ◽  
Mechanism Study ◽  
Compressive Strength Test ◽  
Large Water

It takes on the technical and economic double benefits that fly ash taking the place of cement. However, water/binder of modern concrete is generally low; the research on the concrete performance which is based on large water/binder is no longer suitable for analysis of modern concrete. As to this problem, using different proportions of W/B and FA dosage as influencing factors, specimen is compounded for the compressive strength test. Then, mechanical properties of HPC are studied systematically. Based on this, macro-performance is analyzed from a micro-mechanism point of view through taking the electron micrograph. As the study shows, strength of HPC mixed with fly ash has low characteristics at early period while high ones at later period. At later hydration, fly ash effect plays a significant role, the growth rate of concrete strength increases as the increase of FA dosage. Compressive strength of concrete decreases as the increase of W/B and FA dosage. When the W/B is high, compressive strength is not sensitive to the change of W/B and FA dosage; but when the W/B decreases from 0.30 to 0.25, the concrete strength transition occurs. The influence of W/B on concrete compressive strength is more significant than that of the FA dosage; in the preparation of HPC, fly ash can be added more and cement is added less relatively by decreasing the W/B, displaying the role of micro-aggregate filling and modification, improving the strength and other performance of concrete. The study on micro-mechanism proves well the macro-phenomena above.

Low Strength Self Compacting Concrete Compressive Strength Test

2013 ◽  
Vol 275-277 ◽  
pp. 2041-2044
Author(s):  
Feng Yan ◽  
Nan Pang
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Compression Strength ◽  
Strength Test ◽  
The Self ◽  
Concrete Compressive Strength ◽  
Self Compacting Concrete ◽  
Intensity Index ◽  
Compressive Strength Test ◽  
Low Strength

In this paper,the mechanical properties were studied,the self compacting concrete cubic compression strength,prismatic compressive strength test,discussed two kinds of relationship between intensity index.

scholarly journals KARAKTERISTIK SELF COMPACTING CONCRETE (SCC) TANPA CURING

2018 ◽  
Author(s):  
erniati
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Compressive Strength ◽  
Fresh Concrete ◽  
Strength Test ◽  
Splitting Tensile Strength ◽  
Good Resistance ◽  
Self Compacting Concrete ◽  
Compressive Strength Test ◽  
Resistance Durability

Self Compacting Concrete (SCC) is one solution to get concrete construction which it has good resistance. Durability of concrete was obtained by the good concrete compaction to be done by a skilled workforce. However, one of the negligence that often occur in the field ie after casting they was ignoring curing of the hardening concrete. This study discusses the workability of fresh concrete and mechanical properties (compressive strength and splitting tensile strength) on SCC without curing. Testing of the concrete workability based on EFNARC standard. The mechanical properties test based on ASTM standards. The method Compressive strength test based on ASTM standards 39 / C 39M - 12a, whereas splitting tensile strength accordance standard ASTM C496 / C496M-11. The results of the study indicate that the SCC without curing effect on the reduction in compressive strength at ages 1, 3, 7, 28, and 90 days in a row at 4.11 MPa (16.1%); 4.90 MPa (13.9%); 6.64 MPa (13.1%); and 6, 72 MPa (12.75%). Splitting tensile strength decreased respectively by 0.1 MPa (3.25%); 0.26 MPa (7.99%); 0.4 MPa (9.52%); and 0.39 MPa (9.16%).

scholarly journals Mercerization Effect on Mechanical Properties of Empty Fruit Bunch Fibre in Reinforcing Low Densities Lightweight Foamed Concrete

2019 ◽  
Vol 8 (2S2) ◽  
pp. 243-253
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Sodium Hydroxide ◽  
Chemical Treatment ◽  
Strength Test ◽  
Empty Fruit Bunches ◽  
Compressive Strength Test ◽  
Foamed Concrete ◽  
Axial Compressive Strength ◽  
Sodium Hydroxide Treatment

Due to the minimum cost, availability and renewable character, natural fibre had managed to grab the attention of researchers to utilize this industrial waste as industrial and structural material to restore the structures. This is due to the renewable nature of the fibre, minimal cost, low density and the amenability towards the chemical modification. The purpose of this paper is to oversee the reaction of empty fruit bunches fibre in the low densities of lightweight foamed concrete after been modified with the different percentages of alkali treatment using sodium hydroxide (NaOH). The effect of this fibre chemical treatment (2%-10% sodium hydroxide chemical treatment) on the mechanical properties of lightweight foamed concrete was investigated expansively. There were three different densities of lightweight foamed concrete (500kg/m3 , 700kg/m3 and 900kg/m3 ) used in this study. There were three different experimental test conducted to determine the lightweight foamed concrete strengths which were axial compressive strength test, flexural test and splitting tensile strength. The test result shows that 6% of sodium hydroxide chemical treatment of empty fruit bunches fibre offered the best results. The result showed that the highest strength result is obtained from 900kg/m3 density of lightweight foamed concrete with 6% sodium hydroxide treatment on the empty fruit bunches fibre while the lowest strength was obtained by 500kg/m3 lightweight foamed concrete with 0% of sodium hydroxide treatment on the fibre. Out of 257% of intensification in axial compressive strength test, 88% were showed in flexural strength test and 61% increase in splitting tensile strength test.

scholarly journals Mechanical Properties of Large Slump Concrete Made by Post-Filling Coarse Aggregate Mixing Procedure

Materials ◽  
2020 ◽  
Vol 13 (12) ◽  
pp. 2761 ◽  
Author(s):  
Jinqing Jia ◽  
Qi Cao ◽  
Lan Luan ◽  
Ziyi Wang ◽  
Lihua Zhang
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
High Performance ◽  
Coarse Aggregate ◽  
Concrete Strength ◽  
Experimental Tests ◽  
Building Construction ◽  
Modulus Of Rupture ◽  
High Rise ◽  
Axial Compressive Strength

High-performance pumping concrete has been widely used in high-rise building construction because of its superior qualities. However, early cracking problems can occur in cast-in-place pumping concrete, which is due to the excessive use of cement. In this paper, an innovative concrete mixing procedure called “post-filling coarse aggregate concrete” (PFCC) was adopted and applied to large slump concrete. The influence of the post-filling coarse aggregate (PFA) ratio on the mechanical properties of large slump concrete were investigated. Three different concrete strength grades (C30, C40 and C50) and five different PFA ratios (0%, 10%, 15%, 20%, 25%) were considered. The designed slump for the reference concrete was 180–200 mm. Experimental tests on the compressive strength of cubic specimens, axial compressive strength of prism specimens, splitting tensile strength, modulus of rupture and modulus of elasticity were performed. All tests were conducted in room conditions. Results showed that the slump of the PFCC decreases as the PFA ratio increases. It also indicated that, in general, the mechanical properties of PFCC are not linearly increasing as the PFA ratio rises, and there exists a turning point. Based on the experimental investigation and analysis in this study, the optimum post-filling coarse aggregate ratio is recommended to be 20%.

scholarly journals PERBANDINGAN VARIASI AGREGAT HALUS YANG BERASAL DARI GUNUNG KELUD, KALI PUTIH, DAN SUNGAI BRANTAS TERHADAP KUAT TEKAN BETON

2018 ◽  
Vol 8 (1) ◽  
pp. 32-41
Author(s):  
Muhamad Nasrulloh,
Keyword(s):  
Compressive Strength ◽  
Construction Projects ◽  
Laboratory Experiments ◽  
Concrete Strength ◽  
Base Material ◽  
Strength Test ◽  
Fine Aggregate ◽  
Concrete Compressive Strength ◽  
Compressive Strength Test

Concrete is a building material widely used in construction projects. In principle to create concretewith very good quality by the quality of its constituents of fine aggregate (sand), coarse aggregate,semen, and air, and the way it works. The fine aggregate (sand) as the base material for concretemanufacture is required in determining the quality of the concrete, since the aggregate is a fillerbound by cement and water into a solid mass, the quality of fine aggregate luminaire (sand) directlyaffects the quality of the concrete. The fine aggregate (sand) used in this study came from 3samples in Blitar area, ie 1 sample from Kelud mountain, 2 samples from Kali Putih, and 3 samplesfrom Brantas River. Location of research at the Laboratory Structural Civil Engineering UniversityTribhuwana Tunggadewi Malang. The method used in this study using laboratory experiments andguided on SNI 03-06912000. After a fine aggregate study of 3 samples in Bitarit obtained theaverage compressive strength test, samples of 1 fine aggregate (sand) of Kelud mount recordedaverage of concrete compressive strength of 7,802 Mpa (highest), sample 2 of fine aggregate ( sand)of Kali Putih resulted in average concrete strength test of 3.208 Mpa (lowest), and a sample of 3 fineaggregate (sand) of Brantas river yielded average concrete strength test of 3,272 MPaBeton merupakan material bahan bangunan yang banyak dipergunakan dalam pelaksanaan proyekkonstruksi. Pada prinsipnya untuk mendapatkan beton dengan kualitas yang baik sangatdipengaruhi oleh kualitas dari bahan – bahan penyusunnya yaitu agregat halus (pasir), agregat kasar,semen, dan air, serta cara pengerjaannya. Agregat halus (pasir) sebagai bahan dasar untukpembuatan beton memegang peranan penting dalam menentukan mutu beton, karena agregatmerupakan bahan pengisi yang diikat oleh semen dan air menjadi massa padat, sehingga kualitasagregat halus (pasir) mempengaruhi langsung terhadap mutu beton. Agregat halus (pasir) yangdibahas pada penelitian ini berasal dari 3 sampel di wilayah Blitar, yaitu sample 1 dari gunung Kelud,sampel 2 dari kali Putih, dan sampel 3 dari sungai Brantas. Lokasi penelitian di LaboratoriumStruktur Teknik Sipil Universitas Tribhuwana Tunggadewi Malang. Metode yang digunakan dalampenelitian ini menggunakan eksperimen laboratorium dan berpanduan pada SNI 03-06912000.Setelah dilakukan penelitian agregat halus dari 3 sampel diBlitar mendapatkan hasil uji kuat tekanrata -rata yaitu, sample 1 agregat halus (pasir) gunung Kelud menghasilkan rata – rata uji kuat tekanbeton sebesar 7,802 Mpa (tertinggi), sample 2 agregat halus (pasir) Kali Putih menghasilkan rata –rata uji kuat tekan beton sebesar 3,208 Mpa (terendah), dan sample 3 agregat halus (pasir) sungaiBrantas menghasilkan rata – rata uji kuat tekan beton sebesar 3,272 Mpa

scholarly journals Pozzolanic and mechanical properties of Date Palm Seed Ash (Dpsa) concrete

2020 ◽  
Vol 39 (3) ◽  
pp. 680-686
Author(s):  
A.S.J. Smith ◽  
G. Xu ◽  
M.J. Garba ◽  
M.Y. Aliyu
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Water Absorption ◽  
Date Palm ◽  
Activity Index ◽  
Strength Test ◽  
Partial Replacement ◽  
Test Results ◽  
Setting Times ◽  
Compressive Strength Test

This paper presents the findings of a research work conducted on how to improve the mechanical properties of concrete using Date Palm Seed Ash (DPSA) as partial replacement of cement. The DPSA used was obtained by controlled burning of date palm seed in a kiln at a maximum temperature of 630oC for eight hours and air cooled afterwards. The ash obtained was sieved through 75μm sieve and its oxide composition analysed using X-ray fluorescence (XRF) procedures. DoE method of mix design was used to produce concrete ingredients for grade 30N/mm2 giving a water-cement ratio of 0.53. The effect of partial replacement of cement with DPSA on cement paste and concrete using 0, 2.5, 5, 7.5, 10, 15 and 20% DPSA was investigated through consistency and setting times tests, workability test, compressive strength test (at 7, 21, 28 and 56 days curing duration), pozzolanic activity index evaluation and water absorption test. Results show that DPSA has high silicon dioxide (45.50%), aluminum oxide (20.75%) and Iron oxide (7.25%). Findings indicate that the consistency and setting times of cement-DPSA paste increased with increase in the replacement of cement with DPSA. The workability of DPSA concrete decreased with increase in cement replacement. Compressive strength test results show that cement can be replaced with DPSA up to 10% as the compressive strength at 10% replacement is 31.5N/mm2 as against the 31N/mm2 of the normal concrete, at 56 days. The pozzolanic activity index result also show that DPSA concrete meets up the minimum requirement of 75% specified by ASTM C618-15. Also, the water absorption capacity of DPSA concrete at the highest replacement (20%) is 11% less than that at 0%. Keywords: Cement, Compressive strength, Concrete, Date palm seed ash, Partial replacement, Pozzolana

Sodium Sulfate Corrosion of Polypropylene Concrete Strength Curve of Impact Study

2015 ◽  
Vol 1094 ◽  
pp. 265-268
Author(s):  
Chang Zheng Sun ◽  
Fan Fan Zhu ◽  
Ying Dong Lin
Keyword(s):  
Compressive Strength ◽  
Sodium Sulfate ◽  
Ultrasonic Method ◽  
Concrete Strength ◽  
Sulfate Solution ◽  
Strength Test ◽  
Test Block ◽  
The Press ◽  
Compressive Strength Test ◽  
Real Value

Using ultrasonic method for various corrosion instars of clear water, sodium sulfate solution corrosion respectively after block of NDT, polypropylene mortar test results calculated according to the theory of strength. Through the press again the compressive strength test, it is concluded that polypropylene mortar test block intensity of real value[4]. Through the press again the compressive strength test, it is concluded that polypropylene mortar test block intensity of real value.

scholarly journals PENGARUH PENAMBAHAN SERAT GONI TERHADAP KUAT TEKAN DAN KUAT TARIK BETON

2018 ◽  
Vol 2 (2) ◽  
pp. 34
Author(s):  
M Nuklirullah
Keyword(s):  
Tensile Strength ◽  
Compressive Strength ◽  
Natural Fiber ◽  
Concrete Strength ◽  
Reinforce Concrete ◽  
Strength Test ◽  
Jute Fiber ◽  
Unit Weight ◽  
Compressive Strength Test ◽  
Concrete Mix

Concrete has less good properties, ie brittle so it is not strong enough to withstand tensile. To overcome the bad nature of the concrete can be done by adding fiber (fiber) on the concrete mix. The goal is to reinforce concrete with fiber that is spread uniformly into a concrete mix. The commonly used fibers are made of steel, polymer, or glass fiber. One type of fiber that can be used is roselle fiber which is the material of the burlap maker which belongs to the category of natural fiber. This research was conducted with the aim to know the compressive strength and tensile strength of concrete due to the influence of the addition of jute fiber. Variation of mixed fiber used is 0%, 1% and 3%. The test specimens were used in the form of a cylinder with a diameter of 15 cm and a length of 30 cm for a compressive strength test of 3 pieces and a tensile strength test of 3 pieces for each variation of the jute fiber mixture used. The results showed that with the addition of jute fiber decreased the value of workability. The unit weight of concrete decreases with increasing fiber content. Concrete strength and concrete tensile strength decrease with increasing jute fiber.Keywords: Concrete, Fiber, Compressive Strength, Tensile Strength

scholarly journals PENGARUH PENAMBAHAN SERAT ALAMI ECENG GONDOK TERHADAP KUAT TEKAN BETON BERKUALITAS RENDAH

UKaRsT ◽  
2018 ◽  
Vol 2 (1) ◽  
pp. 10
Author(s):  
Nur Affandy ◽  
Zulkifli Lubis
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Water Hyacinth ◽  
Strength Test ◽  
Concrete Compressive Strength ◽  
Compressive Strength Test ◽  
Foreign Standard ◽  
Test Objects ◽  
Water Hyacinth Fiber ◽  
Cylindrical Test

This research will be conducted in accordance with Indonesian Standard SK SNI and foreign standard ASTM. The test object consists of a cylindrical test with the diameter of 15 cm and a height of 30 cm, and it is developed to 4 mixture variations with the amount of 2%, 4%, 6%, 8%, of total cement. The mechanical properties of concrete is being tested include concrete compressive strength. Itis tested at the age of 7 days, and then converted at 28 days, using test objects mixed with different fiber variations. The results of the test are: compressive strength test with 2% variation is 7,54MPa, compressive strength testwith 4% variation is 6,74 Mpa, compressive strength with 6% variation is 4,58 Mpa, compressive strength with 8% variation is 3.63 MPa. Maximum concrete compressive strength occurs in 2% fiber  mixture, while the minimum concrete compressive strength occurs in 8%. From these results, it can be concluded that the addition of water hyacinth fiber to the mixture for low quality concrete has not been able to increase its compressive strength.Keywords: Fiber, Water Hyacinth, Concrete Compressive Strength.

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