scholarly journals An Experimental Investigation on the Strength Properties of Self Curing Concrete by Using Super Absorbrnt Polymer

2019 ◽  
pp. 634-643
Author(s):  
V. Veera Mohan Reddy ◽  
K. Mohammed Rasheed
Keyword(s):  
Flexural Strength ◽  
Fresh Concrete ◽  
Concrete Strength ◽  
Plain Concrete ◽  
Hardened Concrete ◽  
Split Tensile Strength ◽  
Super Absorbent Polymer ◽  
Positive Effects ◽  
Internal Water ◽  
Absorbent Polymer

The super absorbent polymer (SAP) has the nature of absorbing large amount of water and converts into gel and at the same time it swells or a large amount of volume change occurs when SAP reacted with water. Main SAP agent is sodium polyacrylate . These properties are very useful and effective in plain concrete. It is proved that it has many positive effects on the properties of concrete in both stages; 1.fresh concrete, 2. hardened concrete. Super absorbent polymer is mainly having the water tightness properties of plain concrete with time. The study includes short term and long term effect of the super absorbent polymer on the water sealing properties. Many advantages exist in the use of super absorbent polymer in plain concrete with internal water. This internal water source acts as internal curing agent after the final setting of concrete. At the same time the SAP releases water at relatively slower rate at the fresh concrete stage. The SAP also provides additional voids in the concrete. These voids affect the concrete strength negatively at the same time improve the concrete performance by improving the concrete workability and consistency, reducing the concrete susceptibility to freezing thawing cycle, and improving concrete stability. In this project we tried to study the behavior of super absorbent polymer in mechanical properties of compression, split tensile and flexural strength with internally cured concrete. An experiment has been carried out for M50 concrete using Super absorbent polymer of 0%,0.2%,0.3%,0.4% and 0.5% respectively. concrete cubes, cylinders and beams are casted and tested for 7 days and 28 days. The results are discussed in detailed and the compressive strength and split tensile strength greater for 0.2% of sap when compared with the remaining percentages of sap concrete. 0.2% of sap is optimum for the Beam of size 700X150X150 mm and shows the high flexural strength.

Investigation of Critical Quality Assurance Parameter Variations for Concrete

1997 ◽  
Vol 1575 (1) ◽  
pp. 92-101
Author(s):  
Richard K. Smutzer ◽  
Sedat Gulen ◽  
Youlanda K. Belew ◽  
Virgil L. Anderson
Keyword(s):  
High Pressure ◽  
Quality Assurance ◽  
Flexural Strength ◽  
Concrete Strength ◽  
Pulse Velocity ◽  
Hardened Concrete ◽  
Army Corps ◽  
Split Tensile Strength ◽  
Air Content ◽  
Concrete Mix

The Indiana Department of Transportation is involved in preparing statistically sound specifications for strong and durable concrete used in quality assurance programs. Previous laboratory studies relating concrete strength to air content and concrete mix designs dealt with variation in compressive strength. This study searched for a statistically sound relationship between air content, concrete mix designs, and flexural strength. This study also developed a high-pressure method of hardened concrete air content determination. Sixty-four independent batches (combinations) of concrete were produced, each batch was subjected to a total of 24 tests—4 plastic and 20 hardened. The design factors were aggregate type and gradation, plastic air content, cement, and pozzolanic content and testing operator. After plastic testing, three flexural strength beams were cast from each batch of concrete. The experimental design response variables consisted of flexural, compressive, and split tensile strength along with pulse velocity. Analysis of variances, indicated that the optimum flexural strength could be obtained using as-received stone course aggregate and an air content of between 6 percent and 7.9 percent, with no fly ash. A high-pressure air meter, similar to the meter developed by the Army Corps of Engineers, was used. A strong statistical correlation of determination, r2 = 0.94, was obtained between plastic and the hardened concrete air content using this meter.

Effect of Curing Methods on Strength and Durability Properties of M30 Grade Concrete

2021 ◽  
Vol 9 (11) ◽  
pp. 1386-1389
Author(s):  
Chidananda G
Keyword(s):  
Compressive Strength ◽  
Fresh Concrete ◽  
Hardened Concrete ◽  
Concrete Compressive Strength ◽  
Super Absorbent Polymer ◽  
Carbonation Resistance ◽  
Curing Methods ◽  
Water Curing ◽  
Strength And Durability ◽  
Absorbent Polymer

Abstract: This paper presents an experimental investigation on influence of different curing methods on the performance of M30 grade concrete. Different curing methods such as air curing, pond curing, intermittent curing, gunny bags curing, chemical curing and using Super Absorbent Polymer (SAP) by 0.3% of weight of cement are considered. Slump and compacting factor tests are performed to know the workability of fresh concrete. Compressive strength of hardened concrete is determined for concrete specimens cured by different curing methods. Durability in terms of carbonation resistance on hardened concrete is also performed as per IS 516 (Part 5/Sec 3, 2021) codal provisions. Depending upon the site conditions and availability of potable water, curing methods such as pond curing, intermittent curing, gunny bags curing, chemical curing and SAP curing can be adopted in site to achieve the expected strength and durability requirements. Keywords: Curing methods, Compressive strength and Carbonation resistance.

scholarly journals A Method for Internal Curing Water Calculation of Concrete with Super Absorbent Polymer

2021 ◽  
Vol 2021 ◽  
pp. 1-14
Author(s):  
Shouqi Zhang ◽  
Zhenbao Lu ◽  
Yongxin Li ◽  
Yuan Ang ◽  
Kechao Zhang
Keyword(s):  
Phase Distribution ◽  
Autogenous Shrinkage ◽  
Mineral Admixture ◽  
Internal Curing ◽  
Hardened Concrete ◽  
Hardened Cement ◽  
Cement Pastes ◽  
Super Absorbent Polymer ◽  
Degree Of Hydration ◽  
Absorbent Polymer

The internal curing method is effective in reducing the self-desiccation of concrete, and the amount of internal curing water (IC water) is greatly important to the shrinkage and strength of concrete. A method for calculating IC water of concrete with and without mineral admixture has been developed. The method is derived from Powers’ model for the phase distribution of a hydrating cement paste. To verify the method, a series of autogenous shrinkage and compressive strength of concrete with and without super absorbent polymer (SAP) were evaluated compared with the method proposed previously. To explain the macro performance of hardened concrete, the nonevaporable water content and calcium hydroxide content measurement were utilized to evaluate the degree of hydration of cement pastes. And, mercury intrusion method and image analysis method were used to explore the pore structure in hardened cement pastes and air void characteristics in hardened concrete, respectively. Furthermore, the evolution process was also studied for the relative humidity inside the concrete.

Utilization of Crushed Glass Waste in Concrete Samples Prepared with Coal Fly Ash

2015 ◽  
Vol 244 ◽  
pp. 102-107 ◽  
Author(s):  
Jozef Junak
Keyword(s):  
Compressive Strength ◽  
Fly Ash ◽  
Flexural Strength ◽  
Coal Fly Ash ◽  
Hardened Concrete ◽  
Glass Cullet ◽  
Glass Bottle ◽  
Glass Waste ◽  
Positive Effects ◽  
Natural Aggregate

This article is aimed on the study of glass bottle cullet influence on the compressive and flexural strength development of products prepared as the partial natural aggregate replacement by crushed glass waste. For this study, eight different mixtures containing coloured glass cullet as a full replacement of natural aggregate fractions 0/4, 4/8 and 8/16 mm and two comparative mixtures were prepared. In four of these mixtures, 25% of Portland cement were replaced by coal fly ash. After 7, 28 and 90 days of hardening, samples were tested on flexural strength and compression strength. Results showed, that specimens containing full replacement of fraction 8/16 mm of glass cullet reached the highest compressive strength 43.32 MPa corresponding to concrete strength class C 30/37. Partial cement replacement by coal fly ash leads to low compressive strength after 7, 28 and 90 days of curing. Use of coloured glass bottle cullet in concrete should not have negative impact on the strength characteristics of hardened concrete and should have positive effects for preparing quality fair-faced concrete surfaces.

Mechanical Properties of Steel Fibre-Reinforced High Strength Concrete with High early-Age Strength Used in Freezing Shaft Lining

2012 ◽  
Vol 174-177 ◽  
pp. 1388-1393
Author(s):  
Hai Qing Song ◽  
Teng Long Zheng
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Compressive Strength ◽  
Flexural Strength ◽  
High Strength Concrete ◽  
Steel Fibre ◽  
High Strength ◽  
Plain Concrete ◽  
Split Tensile Strength ◽  
Strength Concrete

Plain concrete is susceptible to cracking under aggressive environment such as in freezing shaft. And addition of steel fibres in plain high strength concrete is proved to be effective in cracking resistance and brittleness improvement, etc. This paper presents results of experimental investigation carried out to study the mechanical properties of steel fibre-reinforced concrete having volume fractions of 0.38%, 0.51% and 0.64% for two types of fibres respectively. The results of this study revealed that there is an increase for all the mechanical properties such as compressive strength, split tensile strength, modulus of elasticity and flexural strength. Enhancement for split tensile strength and flexural strength is more evident than compressive strength.

scholarly journals Performance of super-absorbent polymer as an internal curing agent for self-compacting concrete

2018 ◽  
Vol 162 ◽  
pp. 02023 ◽  
Author(s):  
Suhair Al-Hubboubi ◽  
Tareq al-Attar ◽  
Haider Al-Badry ◽  
Samir Abood ◽  
Rawaa Mohammed ◽  
...  
Keyword(s):  
Fresh Concrete ◽  
Internal Curing ◽  
Curing Agent ◽  
Self Compacting Concrete ◽  
Super Absorbent Polymer ◽  
Strength Tests ◽  
Fresh State ◽  
Concrete Mix ◽  
Water Curing ◽  
Absorbent Polymer

Internal curing agent by using super-absorbent polymer was present in this study, its effect on the properties of self-compacting concrete was evaluated .The SAP content in the concrete mix was 0.5 % by weight of cement. Three procedures for curing were adopted; curing in water, curing in water and air and curing in polyethylene sealed bags. Fresh concrete tests conducted to assess the self-compactability of the produced concrete. Moreover, compressive and splitting strength tests were carried out. The testing program had been extended to the age of 90 days.The use of super-absorbent polymer did not affect the fresh state characteristics of the studied SCC and achieved an increase in both compressive and tensile strengths as compared to the reference concrete mix.

scholarly journals Su Tutucu Polimer (SAP) Uygulamalarının Anadolu Sığla Ağacı (Liquidambar orientalis MİLL.) ve Biberiye (Rosmarinus officinalis L.) Türlerinde Bitki Gelişimi Üzerine Etkisi

2020 ◽  
Vol 8 (3) ◽  
pp. 721
Author(s):  
Hülya Akat
Keyword(s):  
Plant Growth ◽  
Growth Parameters ◽  
Dry Weight ◽  
Rosmarinus Officinalis ◽  
Growth Media ◽  
Super Absorbent Polymer ◽  
Positive Effects ◽  
Rosmarinus Officinalis L ◽  
Absorbent Polymer ◽  
Different Doses

Climate change caused by global warming and the increase in consumption due to rapid population growth are threatened its existence by causes decrease of water from natural resources. Since most of the usable water in the World is evaluated in agriculture, the water needs of plants need to be met in the most accurate and economical way. In this context, super absorbent polymer (SAP) application is one of the methods that provide efficient and economical usage of water. In this research, different doses of super absorbent polymer SAP A200 [0% (control), 0.2%, 0.4% ve 0.6% v/v] applications were applied in conventional (soil) and growth media conditions [peat, perlite and peat:perlite (1:1) v/v]. It was aimed to determine the effects of SAP A200 doses on plant growth of Anatolian Sweetgum Tree (Liquidambar orientalis Mill.) and Rosemary (Rosmarinus officinalis L.) species. The study was established with randomized plot design with 3 replications. In order to determine plant growth characteristics, plant height, stem diameter, root length, root thickness, fresh and dry weight values of roots and shoots were determined. For the two species used in the study, it was observed that all SAP doses had positive effects on plant growth parameters and the best results were obtained in 0.6 % SAP A200 application. It was determined that plant growth values were higher in all growth medias except soil and the best results were obtained in peat: perlite media.

scholarly journals A Review on the Performance of Waste Glass as Partial Replacement of Fine Aggregate

2021 ◽  
Vol 1200 (1) ◽  
pp. 012011
Author(s):  
Norfaniza Mokhtar ◽  
Nurul Atikah Jalani
Keyword(s):  
Fresh Concrete ◽  
Positive Impact ◽  
Waste Glass ◽  
Partial Replacement ◽  
Hardened Concrete ◽  
Fine Aggregate ◽  
Research Papers ◽  
Split Tensile Strength ◽  
Pozzolanic Material ◽  
Waste Production

Abstract Waste glass is one of the biggest contributors in waste production in Malaysia which can be used as partial sand replacement in concrete. Silica exists in waste glass components made it becomes a pozzolanic material and suitable to be used in a concrete mixture. The performance of the waste glass as fine aggregate was reviewed by considering the workability of fresh concrete, the strength, and the splitting tensile of hardened concrete. The range of the replacement waste are 0%, 10%, 20% and 30%. The influence of the waste glass on the microstructure of the concrete also have been evaluated. A total of seventeen previous research papers were collected and review based on the parameters selected. The results shows that replacement of waste glass in concrete give a positive impact for all selected parameters with 20% replacement represent as an optimal percentage replacement. The microstructure of the waste glass concrete resulting that more voids created after 20% replacement of waste glass which affects the compressive strength and split tensile strength of the concrete thus make the optimum replacement percentage is 20% replacement.

scholarly journals The Effect of Using White Sand As Material High Quality Concrete Mix

2021 ◽  
Vol 3 (3) ◽  
pp. 49-61
Author(s):  
Meisye Mitha Siranga ◽  
Suryanti Rapang Tonapa ◽  
Frans Phengkarsa
Keyword(s):  
Tensile Strength ◽  
Compressive Strength ◽  
Flexural Strength ◽  
Fresh Concrete ◽  
High Strength ◽  
Strength Test ◽  
Split Tensile Strength ◽  
White Sand ◽  
Tensile Strength Test ◽  
Test Objects

The use of concrete in Indonesia cannot be separated from skyscrapers, bridges with long spans, and underground buildings which generally have a larger load, so the use of high-strength concrete is necessary. This study aims to determine the value of compressive strength, split tensile strength, flexural strength, modulus of elasticity of concrete and determine the workability of fresh concrete with the addition of 0.8% superplaticizer. The test objects used in the form of cylinders with a diameter of 15 cm and a height of 30 cm as many as 15 pieces, and 3 pieces of blocks measuring 15 cm × 15 cm × 60 cm. From the results of the study, the compressive strength value was 43,007 MPa. The split tensile strength test is 3.584 MPa. The flexural strength test is 4,340 MPa. The elastic modulus test is 28447.956 MPa. From the slump test on fresh concrete with the addition of a superplaticizer, it is obtained by 10 cm.

scholarly journals The Effect of Hybrid Fibers Reinforcement on the Mechanical and Physical Properties of Concrete

2020 ◽  
Vol 14 (1) ◽  
pp. 207-216
Author(s):  
Zaher I. Khayoun ◽  
Hamza M. Kamal ◽  
Yasir K. Ibrahim
Keyword(s):  
Mechanical Properties ◽  
Flexural Strength ◽  
Mechanical Performance ◽  
Plain Concrete ◽  
Fiber Reinforced Concrete ◽  
Hardened Concrete ◽  
Polypropylene Fibers ◽  
Hybrid Fiber ◽  
Hybrid Fibers ◽  
Volume Fractions

Background: Hybrid fiber reinforced concrete is the use of two or more than two fiber textures in a single concrete matrix to improve the overall properties of concrete. Materials and Methods: In this study, the ductility of medium strength concrete was observed to improve by incorporating steel and polypropylene in a ratio of 50:50 as a hybrid fiber. Four proportions of Volume fractions (Vf) were used (0.25, 0.5, 0.75, 1%). The changes in the mechanical properties and density occurred due to the addition of these hybrid fibers. Results: The features examined include bulk density, compressive strength, and flexural strength by using thirteen concrete mixtures with various volume fractions of steel and polypropylene fibers. Discussion: The results showed a significant increase in compressive and flexural strength due to the addition of steel fibers. On the other hand, polypropylene fibers exhibited minor changes in the mechanical properties of hardened concrete exclusively in the mixtures made with both steel and polypropylene fibers in which the strength increased in comparison to plain concrete by 4.4% and to steel fiber group having the optimal strength and other properties. Conclusion: These remarks provide a clear view of the importance of using different fiber reinforcing systems to improve the mechanical performance of concrete, which is considered quasi-brittle.

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