The effect of plasticizing admixture on the physical and mechanical properties of concrete with limestone cement (original) (raw)
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Civil engineering design, 2020
We studied the effects of superplasticizer (SP) (PCE1 and PCE2), air-entraining admixtures (AEA), and supplementary cementitious material (silica fume and fly ash) on the mechanical and durability properties of concrete samples. Eight concrete mix designs were prepared. The first six concrete mix design contained similar aggregates, PCE2 SP, AEA, 350 kg/m 3 cement, and water to cement ratio equal to 0.38, and one of the mentioned mix design was selected as control samples with water to cement ratio equal to 0.57, without PCE2 SP and AEA. We used a different quantity of PCE2 SP and AEA and replaced the fly ash or silica fume as part of cement in two of the mentioned mix designs. The last two concrete mix designs studied the effect of PCE1 SP and AEA on freezing and thawing of concrete mix design. Adding PCE2 SP in concrete mix design increased compressive strength at age 11, 42, and 90 days sharply and reduced the depth of water penetration at the age of 28 and 90 days compared to the control sample. Using simultaneous PCE2 and AEA in concrete mix design did not improve compressive strength significantly and increased slightly depth of water penetration compared to only using PCE2. However, increasing the quantity of AEA to 5% improved both compressive strength and reduced depth of water penetration. In the second group of concrete mix design, adding both PCE1 and AEA increased the number of resistible freezing and thawing cycles of concrete. Side chain length and molecular weight of PCE1 and PCE2 SPs had no important effect on the compressive strength and performance properties of concrete. K E Y W O R D S durability, fly ash, air-entrained admixture, freezing and thawing, silica fume 1 | INTRODUCTION Concrete is one of the most commonly used building materials in the world. However, the long-term performance of the concrete and the influence of environmental parameters on its properties are not fully known. Concrete deteriorations and corrosion of steel reinforcement were generated, for example, by carbonation reaction, chloride ion penetration, freezing and thawing cycles, sulfate attacks, and alkaliaggregate reactions. Choosing and using inappropriate materials, the absence of quality control execution or poor performance of the quality control process and improper curing may shorten the service life and impose high costs. Therefore, some guidelines and standards were approved for concrete durability in constructions, especially in conditions that are vulnerable to environmental attacks such as chloride penetration, carbonation as well as freezing and thawing cycles. Economic impacts resulted from durability problems motivated scientists in the last three decades to do comprehensive researches on this issue, which provided an appropriate basis to increase the durability of concrete structures. 1 Concrete properties such as strength, durability, shrinkage, and permeability are directly influenced by the number, size and distribution of pores in cement paste, aggregate characteristics and interface
Mechanical Strength, Characterization and Suitability of Cement-Plastic Concrete Admixture
Journal of applied science and environmental management, 2024
A significant increment in the consumption of plastic has been monitored globally in recent years, which has led to a high amount of plastic waste. Given its benefits on both an economic and ecological level, recycling plastic waste to create new materials like concrete is considered to be one of the finest ways to get rid of plastic waste. The objective of this paper was to examine the workability, durability, and mechanical strength of concrete with partial replacement of coarse aggregates with plastic waste using standard procedure. The percentages of plastic waste used to replace coarse aggregate were 0%, 5%, 10%, and 15%. Lastly, the mechanical characteristics of the concrete mix specimens was determined by testing them using a testometric and compressor machine. The specimens are then compared with the conventional mix. The test results demonstrated that the compressive strength exhibited a decreasing trend. For mixes ranging from 0% to 15%, the compressive strength varies from 35.66 to 17.88 N/mm2, however the flexural strength significantly decreases when 15% of the coarse aggregate is replaced with plastic waste. It can be concluded that reusing plastic waste as an aggregate during the concrete-making process reduces waste and conserves resources.
Influence of chemical admixtures on density and slump loss of concrete
International Journal of Modern Engineering Research (IJMER)
The results of test conducted on concrete in the presence of plasticizers and super plasticizers. The objective was to observe the change in density of concrete & loss of workability under the influence of plasticizers and super plasticizers at various dosages level. The result of the treated mix was compared with the control mix (mix without admixture). Observations were made on solid phases of concrete, to note the variation in density at constant and reduce water cement ratio. From the experience and knowledge gained from this course of study both, plasticizers and superplasticizers not only improved workability at constant water cement ratio but considerably enhanced the density at reduce water-cement ratio however loss in slump observed.
The effect of cement type and plasticizer addition on concrete properties
Construction and Building Materials, 2013
h i g h l i g h t s Plasticizer types associate of their impact on viscosity of CEM I and CEM II cement. Plasticizer more stop hydration of concrete with CEM I than with CEM II cement. Plasticizer more worsen concrete with CEM I than with CEM II cement properties.
EFFECT OF TYPE AND COMPOSITION OF CHEMICAL ADMIXTURE ON PROPERTIES OF PRODUCED CONCRETE
This work aims to study the effect of different types of superplastizicer. The experiment work included test on slump flow, compressive strength, splitting and modulus of rupture. Water cement ratio and cement content were maintained constant (0.45 and 350 Kg/m3) respectively. Three different admixture (polycarboxylic ether melamine formaldehyde, and of sulphonated naphthalene) have been used. Four dosage of superplastizicer were adopted (0.5, 1, 1.5, 2 and 2.5) liters for 100 Kg of cement. Based on the experimental results, superplasticizers based on Modified polycarboxylic ether are more efficient than other superplasticizers, concerning the degree of workability, compressive strength, and flexible strength Over dosage of SP found to deteriorate the properties of concrete, signs of bleeding and segregation were noticed. However, if the dosage levels of SP are lower than the optimum dosage, increase in admixture dosage may help to enhance the concrete characteristics
Study of various Grades of Concrete with and without Admixture
International Journal for Research in Applied Science and Engineering Technology IJRASET, 2020
The ingredient of concrete are mixed in different proportions, either by volume or by weight, the latter being more precise and scientific. Volume batching of concrete is not allowed by revised IS 456-2000 today and the common method of expressing the proportions of ingredients in concrete mix is in the form of parts or ratio of cement. The fine aggregate and coarse aggregate cement being taken as unity. Cubes are cured alternate wetting and drying condition (partially curing) average compressive strength of concrete cube 30.60 N/mm2. Which is approximately 60 % of target compressive strength. When cube are cost with no curing is carried out, the cube are cured in room, the average compressive strength of the cube at 28 days = 22.5 N/mm2. which approximately 58% of target which do not satisfied the requirement of target of M30 grade concrete , but it will satisfy the requirement of strength for M15 grade concrete. Therefore if the curing is not carried out site , grade of concrete used is M30 then the actual strength obtained at site. Sever cracks in concrete which affect scope serviceability, stability and safety. Which affect stability stiffness strength and seafty of the structure. Therefore curing is essential to gain the strength of concrete, for all structural element such as slab, beam. column and footing curing is to be carried out for 21 days IS code of PPC.
EFFECT OF CHEMICAL ADMIXTURES ON PROPERTIES OF CONCRETE: A METHODOLOGICAL REVIEW
International Journal of Research and Analytical Reviews (IJRAR), 2018
As we know that concrete is a mix of cement, sand, aggregate, water and additional materials such as Admixtures and Mineral additives. In these years, government and industries emphasize on high initial strength and high quality concrete in less times. Because of these reasons researchers have been focused to bring some variations in concrete components to achieve a good quality and high strength concrete. Nowadays using of chemical Admixture become more and more because everyone and every industry want to have a good quality and high strength concrete. We have different additive that we can get these factors so soon such as Mineral additives and Chemical Admixtures and in this review paper we cover Chemical Admixtures such as Plasticizer, Super Plasticizer, Retarding, Accelerating, Air Entraining and each of them has their own properties and different chemical influences on the properties of concrete like compressive strength, tensile strength, workability, water content etc.
Effect of Admixtures on Concrete and Superplasticizers on Cementitious Material
International Journal for Research in Applied Science and Engineering Technology (IJRASET), 2021
Use of chemical and mineral admixtures have proved beneficial in improving quality, workability and have enhanced finish ability of concrete. They also help in maintaining the concrete during its important stages such as mixing, transporting, placing, curing and also in adverse weather conditions. Superplasticizers are super water reducers that allow 15-20% water reducion thereby increasing the workability without any change in the composition of mix.The reduction in water and cement reduces creep, shrinkage and heat of hydration. In this paper effect of different chemical and mineral admixture was studied along with sand to aggregate volume ratio ,cement content and water were analysed by preparing different concrete mixtures using water reducers and superplasticizers. A specimen of 200mm and 300mm was prepared and tested for compressive strength, split tensile strength and young's modulus. Slump test was also performed at 15 min interval. Also superplasticizers (TJ III , LIGNIN-SULPHONATE-based and NAPHTHALENE-SULPHONATE-based) were taken and their effect on the heat of hydration and induction period of cementitious material (portland cement) was studied.
Effects of Super Plasticizing and Retarding Admixtures on Properties of Concrete
The adverse effects of elevated temperatures on the properties of the fresh concrete include increased water demand, shorter setting time and increased slump loss. Superplasticizers (SP) and retarders are important to enhance the workability and setting time of concrete under hot weather, hence, an experimental investigation was conducted to determine the optimum dosage for the admixtures and to study the effect of over dosage of the mentioned admixtures. Concrete mixes with SP and retarder dosages of 600, 1200, 1800, and 2500 ml/100 kg of cement were prepared, together with control mix (water/cement ratio were 0.50). After casting, normal curing was carried out on the concrete samples. Properties such as compressive strength, was determined, besides determining the workability of the fresh concrete. Over dosage of SP or retarder were found to deteriorate the properties of concrete with indication of lower compressive strength. However, if the dosage levels are lower than the optimum dosage, increase in admixture dosage might help to enhance the concrete characteristics.