Product development
Triangular Polyestor Fibers as secondary reinforcement
Published
3 years agoon
By
adminKRS Narayan and Rajiv Gauri talks about the importance of Polyester Fibers as secondary reinforcement in concrete improes strength, durability, toughness and fatigue resistance.
Fiber Reinforced Concrete" is relatively a new construction material developed through extensive research and development work during the last two decades. Fiber Reinforced Concrete (FRC) is defined as composite material which consists of conventional concrete reinforced by randomly dispersed short length fibers of specific geometry, made of steel, synthetic (polymeric) or natural fibers. Plain cement concrete has very low tensile strength and causes formation of micro cracks in stressed and unstressed states of concrete. Also, it has a low strain at fracture and brittleness with less ductility especially in case of High Performance Concrete. Fiber Reinforced Concrete is the answer to modify these properties of Plain Concrete.
Advantages of FRC
Various advantages of Fiber Reinforced Concrete are,
• Resistance to Micro-Cracking.
• Toughness and Post-Failure Ductility
• Impact & Abrasion Resistances
• Resistance to fatigue
• Improved strength in shear, tension, flexure and compression.
• Reduced permeability
The interaction between the fiber and concrete matrix is the fundamental property that affects the performance of a cement based fiber composite materials. An understanding of this interaction is needed for forecasting the fiber contribution and for predicting the behavior of such composites. The following are the major parameters affecting the fiber interaction with the matrix.
• Condition of the matrix-uncracked or cracked.
• Matrix composition
• Geometry of the fiber-triangular or circular
• Type of fiber-steel, polymeric, mineral or naturally occurring fiber
• Surface characteristics of the fiber
• Stiffness of the fiber in composition with matrix stiffness
• Orientation of the fibers-aligned versus random distribution
• Volume fraction of fibers
• Rate of loading
• Durability of fiber in the composite and the long term effect in the concrete matrix.
Experimental investigation
The behaviour and strength of conventional and fiber reinforced concrete are ascertained by testing the specimens in the laboratory. This paper deals with the mix design, preparation of the specimen, and casting, testing and test results of the specimens.
Materials
It is necessary to get the maximum performance out of all of the materials involved in producing a concrete. The materials involved in this project are as follows
• Portland cement,
• Coarse aggregate.
• Fine aggregate and super plasticizers.
• Water
• Super Plasticizer
• Mixed design
• The additional material involved in this project is triangular polystor fiber-synthetic fiber. Material properties are given in Table 1.
Cement
The cement used for this investigation was OPC-53 grade Birla cement. The specific gravity of the cement was found to be 3.11 and it is conforming to IS 269-1979.
Fine aggregate
The fine aggregate used for all the specimens was complying with IS 383- 1970. The specific gravity of fine aggregate was 2.52, sieve analyses were conducted and it was found that the sand used was conforming to zone II grading. The fineness modulus of fine aggregate was 2.074.
Coarse aggregate
The coarse aggregate used was hard broken stone drawn from an approved quarry. Mean size of 20mm was used. The specific gravity of coarse aggregate was 2.73. And it was confirming to IS 383 – 1970
Water
Portable water available in the laboratory was used for casting all the specimens in this investigation. The quality of water was found to .satisfy the requirements of IS 456- 2000.
Synthetic Fiber (triangular polystor fiber)
The fiber used is a 12mm long ‘Virgin triangular monofilament’ Polystor, with an aspect ratio of < 360. For a mean sized aggregate of 20mm, 12mm fiber length is adequate. (Fig. 1)
Super plasticizer
Commercially available super plasticizer having a specific gravity of 1.2 at 25 degree centigrade. Desired Slump was 75 mm + – 25 mm for better workability
Mix design
In this study, Indian standard recommended method (IS 10262-1982) has been adopted for the mix design. The mix proportion adopted for concrete is 1: 1.238:2.917 with wlc ratio of 0.4 for a desired slump of 75mm +1- 25mm. All the samples are prepared from the desired mix. The volume of fiber added is 0.25% of weight of cement. Details of mix design is given in Table 2.
Testing procedure
Split Tensile Strength Test
The test was conducted as per IS 5816-1970. The test was carried out by placing the cylindrical specimen of diameter 150 mm and height 300 mm, horizontally between the loading surface of a compressive testing machine and the load was applied until failure of the cylinder along the vertical diameter. The maximum load applied was noted down.
Flexural Test
The test was conducted as per IS 516-1959. Beams of size 100 x 100 x 500 mm were used for the determination of flexural strength. The test was conducted using the universal testing machine adopting two points loading. The specimen was positioned in the testing reaching and a steel I section beam for transferring the concentrated load as the two point load (1/3 each other) was kept over the concrete beam. The supporting length of the prisms was fixed at 400 mm and load was applied up to final failure of the specimen.(Fig.2)
The test was conducted using compressometer as per IS516 – 1959. The cylinder of standard size 300 mm height and 150 mm dia were used to find the modulus of elasticity(Fig. 3). Specimens were placed on UTM of 100 tons capacity without eccentricity and uniform load was applied till the target load failure of the cylinder. The target load and deflection were noted and modulus of elasticity was obtained. The original length of the compressometer is 150mm. The deflection readings are change in length, from that the strain was calculated. For finding young’s modulus of concrete, the deformation of various loads was observed and the results are plotted graphically against the stress. Using the stress strain curve tangent in drawn and modulus of elasticity is found.
Test results
Split Tensile Strength
The cylinder specimens are cast and tested for split tensile strength as per IS 5816-1970 using compression testing machine of capacity 300 tonne. Table 3 gives the test results. This test was conducted as per IS 516-1959 on prisms of standard size I00 x l00 x 500 mm. Tests were carried out in universal testing machine. The-supporting length of the prisms was fixed at 400mm with two points loading at l/3rd distance with each other. Two uniform point loads were applied and the maximum failure load was noted. The modulus of rupture was calculated. Results are given in Table 4. Modulus of Elasticity
Youngs Modulus of Concrete Cylinder
The test was onducted using compressometer as per IS5516-1959. The cylinder of standard size 300 mm height and 150 mm dia were used to find the modulus of electricity. Specimens were placed on UTM of 100 tonne capacity without eccentricity and uniform load was pplied till the target load failure of the cylinder. The target load and defelection were noted and modulus of elasticity was obtained. The original length of the compressometer is 150 m. the defelection readings are in lengt, from that the starain was calculated.
(or) Young’s Modulus Of Concrete
The cylinder specimen is casted and tested for young’s modulus, using UTM of capacity of 100 tons. Results are given in Table 5.
Comparison of Results and Discussions Test results of the specimens are compared and the discussion is made from test results. The fibers concrete is then compared to the conventional concrete.
Split Tensile Strength
The split tensile strength is increased by 30.3 per cent for triangular polystor fibre reinforced concrete over plain concrete. The flexural tensile strength is increased by 17.93 per cent for the triangular Polyester Fibre reinforced concrete over the plain one.
Young’s Modulus of cylinder specimen
The Young’s Modulus is increased by 4.38 per cent for the Triangular Polyester Fibre Reinforced Concrete over plain concrete.
Conclusions
The conclusions of the above metioned tests are given as follows:
• Addition of triangular polyester fiber in concrete increases the split tensile strength at 28 days by 30.3 per cent at the fibre dosage of 0.25 per cent by weight of cement.
• Due to addition of triangular polyester fibre, the flexural strength is increased by 17.86 per cent compared with conventional concrete.
• Stress- Strain Curve for cylinder specimens of Normal v/s Fiber Concrete is given in Fig 4 and 5.
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Advertising or branding is never about driving sales. It’s about creating brand awareness and recall. It’s about conveying the core values of your brand to your consumers. In this context, why is branding important for cement companies? As far as the customers are concerned cement is simply cement. It is precisely for this reason that branding, marketing and advertising of cement becomes crucial. Since the customer is unable to differentiate between the shades of grey, the onus of creating this awareness is carried by the brands. That explains the heavy marketing budgets, celebrity-centric commercials, emotion-invoking taglines and campaigns enunciating the many benefits of their offerings.
Marketing strategies of cement companies have undergone gradual transformation owing to the change in consumer behaviour. While TV commercials are high on humour and emotions to establish a fast connect with the customer, social media campaigns are focussed more on capturing the consumer’s attention in an over-crowded virtual world. Branding for cement companies has become a holistic growth strategy with quantifiable results. This has made brands opt for a mix package of traditional and new-age tools, such as social media. However, the hero of every marketing communication is the message, which encapsulates the unique selling points of the product. That after all is crux of the matter here.
While cement companies are effectively using marketing tools to reach out to the consumers, they need to strengthen the four Cs of the branding process – Consumer, Cost, Communication and Convenience. Putting up the right message, at the right time and at the right place for the right kind of customer demographic is of utmost importance in the long run. It is precisely for this reason that regional players are likely to have an upper hand as they rely on local language and cultural references to drive home the point. But modern marketing and branding domain is exponentially growing and it would be an interesting exercise to tabulate and analyse its impact on branding for cement.
Concrete
Indian cement industry is well known for its energy and natural resource efficiency
Published
2 years agoon
November 18, 2022By
adminDr Hitesh Sukhwal, Deputy General Manager – Environment, Udaipur Cement Works Limited (UCWL) takes us through the multifaceted efforts that the company has undertaken to keep emissions in check with the use of alternative sources of energy and carbon capture technology.
Tell us about the policies of your organisation for the betterment of the environment.
Caring for people is one of the core values of our JK Lakshmi Cement Limited. We strongly believe that we all together can make a difference. In all our units, we have taken measures to reduce carbon footprint, emissions and minimise the use of natural resources. Climate change and sustainable development are major global concerns. As a responsible corporate, we are committed with and doing consistent effort small or big to preserve and enrich the environment in and around our area of operations.
As far as environmental policies are concerned, we are committed to comply with all applicable laws, standards and regulations of regulatory bodies pertaining to the environment. We are consistently making efforts to integrate the environmental concerns into the mainstream of the operations. We are giving thrust upon natural resource conservation like limestone, gypsum, water and energy. We are utilising different kinds of alternative fuels and raw materials. Awareness among the employees and local people on environmental concerns is an integral part of our company. We are adopting best environmental practices aligned with sustainable development goals.
Udaipur Cement Works Limited is a subsidiary of the JK Lakshmi Cement Limited. Since its inception, the company is committed towards boosting sustainability through adopting the latest art of technology designs, resource efficient equipment and various in-house innovations. We are giving thrust upon renewable and clean energy sources for our cement manufacturing. Solar Power and Waste Heat Recovery based power are our key ingredients for total power mix.
What impact does cement production have on the environment? Elaborate the major areas affected.
The major environmental concern areas during cement production are air emissions through point and nonpoint sources due to plant operation and emissions from mining operation, from material transport, carbon emissions through process, transit, noise pollution, vibration during mining, natural resource depletion, loss of biodiversity and change in landscape.
India is the second largest cement producer in the world. The Indian cement industry is well known for its energy and natural resource efficiency worldwide. The Indian cement industry is a frontrunner for implementing significant technology measures to ensure a greener future.
The cement industry is an energy intensive and significant contributor to climate change. Cement production contributes greenhouse gases directly and indirectly into the atmosphere through calcination and use of fossil fuels in an energy form. The industry believes in a circular economy by utilising alternative fuels for making cement. Cement companies are focusing on major areas of energy efficiency by adoption of technology measures, clinker substitution by alternative raw material for cement making, alternative fuels and green and clean energy resources. These all efforts are being done towards environment protection and sustainable future.
Nowadays, almost all cement units have a dry manufacturing process for cement production, only a few exceptions where wet manufacturing processes are in operation. In the dry manufacturing process, water is used only for the purpose of machinery cooling, which is recirculated in a closed loop, thus, no polluted water is generated during the dry manufacturing process.
We should also accept the fact that modern life is impossible without cement. However, through state-of-the-art technology and innovations, it is possible to mitigate all kinds of pollution without harm to the environment and human beings.
Tell us about the impact blended cement creates on the environment and emission rate.
Our country started cement production in 1914. However, it was introduced in the year 1904 at a small scale, earlier. Initially, the manufacturing of cement was only for Ordinary Portland Cement (OPC). In the 1980s, the production of blended cement was introduced by replacing fly ash and blast furnace slag. The production of blended cement increased in the growth period and crossed the 50 per cent in the year 2004.
The manufacturing of blended cement results in substantial savings in the thermal and electrical energy consumption as well as saving of natural resources. The overall consumption of raw materials, fossil fuel such as coal, efficient burning and state-of-the-art technology in cement plants have resulted in the gradual reduction of emission of carbon dioxide (CO2). Later, the production of blended cement was increased in manifolds.
If we think about the growth of blended cement in the past few decades, we can understand how much quantity of , (fly ash and slag) consumed and saved natural resources like limestone and fossil fuel, which were anyhow disposed of and harmed the environment. This is the reason it is called green cement. Reduction in the clinker to cement ratio has the second highest emission reduction potential i.e., 37 per cent. The low carbon roadmap for cement industries can be achieved from blended cement. Portland Pozzolana Cement (PPC), Portland Slag Cement (PSC) and Composite Cement are already approved by the National Agency BIS.
As far as kilogram CO2 per ton of cement emission concerns, Portland Slag Cement (PSC) has a larger potential, other than PPC, Composite Cement etc. for carbon emission reduction. BIS approved 60 per cent slag and 35 per cent clinker in composition of PSC. Thus, clinker per centage is quite less in PSC composition compared to other blended cement. The manufacturing of blended cement directly reduces thermal and process emissions, which contribute high in overall emissions from the cement industry, and this cannot be addressed through adoption of energy efficiency measures.
In the coming times, the cement industry must relook for other blended cement options to achieve a low carbon emissions road map. In near future, availability of fly ash and slag in terms of quality and quantity will be reduced due to various government schemes for low carbon initiatives viz. enhance renewable energy sources, waste to energy plants etc.
Further, it is required to increase awareness among consumers, like individual home builders or large infrastructure projects, to adopt greener alternatives viz. PPC and PSC for more sustainable
resource utilisation.
What are the decarbonising efforts taken by your organisation?
India is the world’s second largest cement producer. Rapid growth of big infrastructure, low-cost housing (Pradhan Mantri Awas Yojna), smart cities project and urbanisation will create cement demand in future. Being an energy intensive industry, we are also focusing upon alternative and renewable energy sources for long-term sustainable business growth for cement production.
Presently, our focus is to improve efficiency of zero carbon electricity generation technology such as waste heat recovery power through process optimisation and by adopting technological innovations in WHR power systems. We are also increasing our capacity for WHR based power and solar power in the near future. Right now, we are sourcing about 50 per cent of our power requirement from clean and renewable energy sources i.e., zero carbon electricity generation technology. Usage of alternative fuel during co-processing in the cement manufacturing process is a viable and sustainable option. In our unit, we are utilising alternative raw material and fuel for reducing carbon emissions. We are also looking forward to green logistics for our product transport in nearby areas.
By reducing clinker – cement ratio, increasing production of PPC and PSC cement, utilisation of alternative raw materials like synthetic gypsum/chemical gypsum, Jarosite generated from other process industries, we can reduce carbon emissions from cement manufacturing process. Further, we are looking forward to generating onsite fossil free electricity generation facilities by increasing the capacity of WHR based power and ground mounted solar energy plants.
We can say energy is the prime requirement of the cement industry and renewable energy is one of the major sources, which provides an opportunity to make a clean, safe and infinite source of power which is affordable for the cement industry.
What are the current programmes run by your organisation for re-building the environment and reducing pollution?
We are working in different ways for environmental aspects. As I said, we strongly believe that we all together can make a difference. We focus on every environmental aspect directly / indirectly related to our operation and surroundings.
If we talk about air pollution in operation, every section of the operational unit is well equipped with state-of-the-art technology-based air pollution control equipment (BagHouse and ESP) to mitigate the dust pollution beyond the compliance standard. We use high class standard PTFE glass fibre filter bags in our bag houses. UCWL has installed the DeNOx system (SNCR) for abatement of NOx pollution within norms. The company has installed a 6 MW capacity Waste Heat Recovery based power plant that utilises waste heat of kiln i.e., green and clean energy source. Also, installed a 14.6 MW capacity solar power system in the form of a renewable energy source.
All material transfer points are equipped with a dust extraction system. Material is stored under a covered shed to avoid secondary fugitive dust emission sources. Finished product is stored in silos. Water spraying system are mounted with material handling point. Road vacuum sweeping machine deployed for housekeeping of paved area.
In mining, have deployed wet drill machine for drilling bore holes. Controlled blasting is carried out with optimum charge using Air Decking Technique with wooden spacers and non-electric detonator (NONEL) for control of noise, fly rock, vibration, and dust emission. No secondary blasting is being done. The boulders are broken by hydraulic rock breaker. Moreover, instead of road transport, we installed Overland Belt Conveying system for crushed limestone transport from mine lease area to cement plant. Thus omit an insignificant amount of greenhouse gas emissions due to material transport, which is otherwise emitted from combustion of fossil fuel in the transport system. All point emission sources (stacks) are well equipped with online continuous emission monitoring system (OCEMS) for measuring parameters like PM, SO2 and NOx for 24×7. OCEMS data are interfaced with SPCB and CPCB servers.
The company has done considerable work upon water conservation and certified at 2.76 times water positive. We installed a digital water flow metre for each abstraction point and digital ground water level recorder for measuring ground water level 24×7. All digital metres and level recorders are monitored by an in-house designed IoT based dashboard. Through this live dashboard, we can assess the impact of rainwater harvesting (RWH) and ground water monitoring.
All points of domestic sewage are well connected with Sewage Treatment Plant (STP) and treated water is being utilised in industrial cooling purposes, green belt development and in dust suppression. Effluent Treatment Plant (ETP) installed for mine’s workshop. Treated water is reused in washing activity. The unit maintains Zero Liquid Discharge (ZLD).
Our unit has done extensive plantations of native and pollution tolerant species in industrial premises and mine lease areas. Moreover, we are not confined to our industrial boundary for plantation. We organised seedling distribution camps in our surrounding areas. We involve our stakeholders, too, for our plantation drive. UCWL has also extended its services under Corporate Social Responsibility for betterment of the environment in its surrounding. We conduct awareness programs for employees and stakeholders. We have banned Single Use Plastic (SUP) in our premises. In our industrial township, we have implemented a solid waste management system for our all households, guest house and bachelor hostel. A complete process of segregated waste (dry and wet) door to door collection systems is well established.
Tell us about the efforts taken by your organisation to better the environment in and around the manufacturing unit.
UCWL has invested capital in various environmental management and protection projects like installed DeNOx (SNCR) system, strengthening green belt development in and out of industrial premises, installed high class pollution control equipment, ground-mounted solar power plant etc.
The company has taken up various energy conservation projects like, installed VFD to reduce power consumption, improve efficiency of WHR power generation by installing additional economiser tubes and AI-based process optimisation systems. Further, we are going to increase WHR power generation capacity under our upcoming expansion project. UCWL promotes rainwater harvesting for augmentation of the ground water resource. Various scientifically based WHR structures are installed in plant premises and mine lease areas. About 80 per cent of present water requirement is being fulfilled by harvested rainwater sourced from Mine’s Pit. We are also looking forward towards green transport (CNG/LNG based), which will drastically reduce carbon footprint.
We are proud to say that JK Lakshmi Cement Limited has a strong leadership and vision for developing an eco-conscious and sustainable role model of our cement business. The company was a pioneer among cement industries of India, which had installed the DeNOx (SNCR) system in its cement plant.
Concrete
NTPC selects Carbon Clean and Green Power for carbon capture facility
Published
2 years agoon
October 12, 2022By
adminCarbon Clean and Green Power International Pvt. Ltd has been chosen by NTPC Energy Technology Research Alliance (NETRA) to establish the carbon capture facility at NTPC Vindhyachal. This facility, which will use a modified tertiary amine to absorb CO2 from the power plant’s flue gas, is intended to capture 20 tonnes of CO2) per day. A catalytic hydrogenation method will eventually be used to mix the CO2 with hydrogen to create 10 tonnes of methanol each day. For NTPC, capturing CO2 from coal-fired power plant flue gas and turning it into methanol is a key area that has the potential to open up new business prospects and revenue streams.
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