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র‍্যাপিড হার্ডেনিং সিমেন্ট

র‍্যাপিড হার্ডেনিং সিমেন্ট (RHC) কে উচ্চ প্রাথমিক শক্তি সিমেন্টও বলা হয়। দ্রুত শক্ত হয়ে যাওয়া সিমেন্ট এবং সাধারণ পোর্টল্যান্ড সিমেন্টের মধ্যে প্রাথমিক পার্থক্য হল চুনের পরিমাণ। চুনের বড় অনুপাত হল দ্রুত শক্ত হয়ে যাওয়া সিমেন্টের স্বতন্ত্র বৈশিষ্ট্য।

ম্যানুফ্যাকচারিং

দ্রুত শক্ত হয়ে যাওয়া সিমেন্ট অধিক নিয়ন্ত্রিত অবস্থায় ওপিসি-র তুলনায় উচ্চ তাপমাত্রায় পোড়ানো হয়

শক্তি

দ্রুত শক্ত হওয়া সিমেন্টের 3 দিনের শক্তি ওপিসি-এর 7 দিনের শক্তির সমতুল্য যখন উভয় সিমেন্টের জন্য জল-সিমেন্টের অনুপাত একই ধরা হয়। শক্তি বৃদ্ধির হার এই কারণে যে ট্রাই-ক্যালসিয়াম সিলিকেট (C3S) এর উচ্চ অনুপাত RHC-তে সিমেন্ট ক্লিঙ্কারের সূক্ষ্মভাবে নাকালের সাথে রয়েছে। যদিও, RHC যে হারে শক্তি অর্জন করে সেই হারে OPC যে হারে শক্তি অর্জন করে তার চেয়ে বেশি, চূড়ান্ত শক্তি RHC এর জন্য একটু বেশি।

বৈশিষ্ট্য

প্রাথমিক সেটিং সময়: 30 মিনিট

চূড়ান্ত সেটিং সময়: 600 মিনিট

নির্দিষ্ট পৃষ্ঠটি 3250 cm2/gm এর চেয়ে বেশি।

RHC OPC থেকে হালকা।

ব্যবহারসমূহ

দ্রুত শক্ত হওয়া সিমেন্ট বেশিরভাগ রাস্তা নির্মাণে ব্যবহৃত হয় যেখানে দীর্ঘ সময়ের জন্য যানবাহন থামানো যায় না। এছাড়াও, RHC ব্যবহার করা হয় যেখানে ফর্মওয়ার্ক পুনঃব্যবহারের জন্য তাড়াতাড়ি সরানো প্রয়োজন। এটি সেই পরিস্থিতিতেও ব্যবহার করা হয় যেখানে পরবর্তী নির্মাণের জন্য পর্যাপ্ত শক্তি যত তাড়াতাড়ি সম্ভব সম্ভব। এগুলি প্রিকাস্ট স্ল্যাব, পোস্ট, বৈদ্যুতিক খুঁটি তৈরিতেও ব্যবহৃত হয়।

সুবিধা

দ্রুত শক্ত হয়ে যাওয়া সিমেন্টের নিরাময় সময় কম হওয়ায় এটি লাভজনক বলে প্রমাণিত হয়।

আরএইচসি-র ক্ষেত্রে সিমেন্টের কিউরিং এবং শক্ত হওয়ার সময় সংকোচন কম হয়।

RHC সালফার প্রতিরোধে ভাল।

তুলনামূলক কম সময়ে শক্তি অর্জন করায় নির্মাণের ভালো গতি অর্জন করা যায়।

অসুবিধা

এটি সাধারণ পোর্টল্যান্ড সিমেন্টের চেয়ে ব্যয়বহুল।

অতিরিক্ত দ্রুত হার্ডেনিং সিমেন্ট

ম্যানুফ্যাকচারিং: ইন্টারগ্রাইন্ডিং ক্যালসিয়াম ক্লোরাইড (CaCl2) সাথে RHC, অতিরিক্ত RHC পাওয়া যেতে পারে। উত্পাদন প্রক্রিয়ার সময় ক্যালসিয়াম ক্লোরাইডের শতাংশ 3% এর বেশি হওয়া উচিত নয়।

শক্তি: অতিরিক্ত RHC এর শক্তি 1-2 দিনে RHC এর তুলনায় প্রায় 25% বেশি যেখানে শক্তি 7 দিন পরে মাত্র 10-20% অতিক্রম করে।

ব্যবহার: ঠান্ডা আবহাওয়ার কংক্রিটিংয়ের জন্য অতিরিক্ত দ্রুত শক্ত হওয়া সিমেন্ট ব্যবহার করা হয়।

জয়ন্ত চন্দ্র

ইন্সট্রাক্টর

সিভিল টেকনোলজি

ড্যাফোডিল পলিটেকনিক ইন্সটিটিউট

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Boost Your Website’s Visibility: Essential SEO Strategies for 2023

In today’s digital landscape, search engine optimization (SEO) is crucial for the success of any website. With ever-evolving algorithms and increasing competition, staying on top of the latest SEO strategies is essential to boost your website’s visibility and drive organic traffic. In this blog post, we will explore the most effective SEO techniques and provide you with practical tips to optimize your website for 2023.

  • Conduct Thorough Keyword Research: Keywords are the foundation of SEO. Start by identifying relevant keywords and key phrases that your target audience is likely to use when searching for products or services similar to yours. Utilize keyword research tools to determine search volume, competition, and long-tail keywords to target.
  • Optimize On-Page Elements: Optimize your website’s on-page elements to ensure search engines understand your content and its relevance. Focus on optimizing page titles, meta descriptions, headings (H1, H2, etc.), and URL structures. Incorporate target keywords naturally into your content while maintaining readability. 
  • Create High-Quality and Engaging Content: Publishing high-quality, informative, and engaging content is crucial for SEO success. Write comprehensive articles, blog posts, and guides that provide value to your audience. Include relevant keywords naturally in your content, but avoid keyword stuffing. Incorporate multimedia elements such as images, videos, and infographics to enhance user experience. 
  • Optimize for Mobile Devices: Mobile optimization is no longer optional; it’s a necessity. With the increasing use of smartphones and tablets, search engines prioritize mobile-friendly websites. Ensure your website is responsive and provides a seamless browsing experience across different devices. Optimize page loading speed, use responsive design, and consider implementing Accelerated Mobile Pages (AMP) for faster loading times.
  • Focus on User Experience (UX): Search engines value user experience, so make sure your website is user-friendly and easy to navigate. Improve site architecture, use clear and intuitive navigation menus, and optimize internal linking to enhance user experience. Provide relevant and easily accessible information to keep visitors engaged and encourage them to explore further.
  • Build High-Quality Backlinks: Backlinks remain an essential factor for SEO success. Focus on acquiring high-quality backlinks from reputable websites in your industry. Develop a link building strategy that includes guest posting, influencer outreach, and partnerships. Create compelling and shareable content that naturally attracts backlinks from authoritative sources.
  • Leverage Social Media and Online Presence: Social media signals play a role in SEO rankings, so establish a strong presence on relevant platforms. Share your content, engage with your audience, and encourage social sharing. Optimize your social media profiles and ensure consistent branding across different channels. Utilize social media advertising and influencer collaborations to amplify your reach.
  • Monitor and Analyze Performance: Regularly monitor and analyze your website’s performance using tools like Google Analytics and Google Search Console. Track keyword rankings, organic traffic, click-through rates, and conversion rates. Identify areas for improvement and adjust your SEO strategies accordingly.

In an increasingly competitive online landscape, implementing effective SEO strategies is vital for your website’s visibility and success. By conducting thorough keyword research, optimizing on-page elements, creating high-quality content, optimizing for mobile devices, focusing on user experience, building high-quality backlinks, leveraging social media, and monitoring performance, you can enhance your website’s SEO and drive organic traffic. Stay up to date with the latest SEO trends and adapt your strategies accordingly to stay ahead of the competition.

Muhammad Shahidul Islam

Sr.Instructor of Computer Technology

Daffodil Polytechnic Institute

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The Importance of Mindfulness for Students in Bangladesh

The Importance of Mindfulness for Students in Bangladesh

As I have been serving as a teacher for several years, I have observed that students in our country are under immense pressure to succeed academically. With a highly competitive education system and limited opportunities, it can be easy for students to feel overwhelmed and stressed. However, practicing mindfulness can help students stay focused and centered, and ultimately lead to greater success.

  1. What is Mindfulness? 

Mindfulness is the practice of being present and fully engaged in the current moment, without judgment or distraction. This means paying attention to your thoughts, emotions, and physical sensations, and staying focused on the task at hand.

  1. How Does Mindfulness Work?

Mindfulness works by training the brain to focus on the present moment, rather than dwelling on the past or worrying about the future. This involves paying attention to one’s thoughts, emotions, and physical sensations without judgment, and acknowledging them without becoming overwhelmed by them. By practicing mindfulness regularly, students in Bangladesh can develop a greater sense of self-awareness and learn to manage their thoughts and emotions in a more constructive way.

Studies have shown that mindfulness can actually change the brain’s neural pathways, resulting in increased activity in regions associated with positive emotions and decreased activity in regions associated with negative emotions. This can lead to a greater sense of well-being and reduced stress levels. Additionally, mindfulness has been found to have a positive impact on the immune system, resulting in improved physical health.

In short, mindfulness works by rewiring the brain to focus on the present moment and manage thoughts and emotions in a more positive and constructive way. With regular practice, students in Bangladesh can reap the many benefits of mindfulness and improve their overall well-being.

  1. Importance of Mindfulness for Students in Bangladesh

There are several benefits of mindfulness for students in Bangladesh, including:

  • Improved academic performance: When students practice mindfulness, they learn to tune out distractions and stay focused on their studies, which can lead to improved academic performance.
  • Reduced stress and anxiety: Mindfulness can help students manage the stress and anxiety that often comes with a highly competitive education system.
  • Increased self-awareness: By practicing mindfulness, students can become more aware of their thoughts and emotions, and develop a greater sense of self-awareness.
  • Improved mental health: Mindfulness can also improve mental health by reducing symptoms of depression and anxiety.

According to a report published by the Dhaka Tribune, the demand for mindfulness and meditation programs has increased by 50% in the last five years in Bangladesh. The report highlights that people from various backgrounds, including students, professionals, and homemakers, are seeking mindfulness practices to improve their mental health and well-being. The report suggests that the increasing demand for mindfulness programs in Bangladesh indicates a growing awareness of the importance of mental health and well-being.

  1. How to Practice Mindfulness: There are several ways that students in Bangladesh can practice mindfulness, including:
  • Meditation: Taking a few minutes each day to meditate can help students stay centered and focused.
  • Breathing exercises: Deep breathing exercises can help students calm their minds and reduce stress.
  • Mindful eating: Eating mindfully, by paying attention to the taste, texture, and aroma of food, can help students develop a greater appreciation for the present moment.
  • Mindful walking: Taking a walk and being fully present at the moment can help students reduce stress and improve their mental health.

In conclusion, mindfulness is a valuable tool for students in Bangladesh that can help them stay focused, reduce stress, and ultimately achieve greater academic success. As a teacher, I encourage my students to practice mindfulness regularly, and I have seen firsthand the positive impact it can have on their lives. By taking just a few minutes each day to practice mindfulness, students in Bangladesh can improve their mental health and overall well-being. So, I urge all students to give mindfulness a try and see the positive effects for themselves.

Benojir Tabassum

Instructor

Business Studies

Daffodil Polytechnic Institute

Reference: Bangladesh Institute of Health Sciences. Mindfulness: A Promising Tool for Mental Health Promotion (2021).

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Relation between detail area plan & working drawing

A detailed area plan and a working drawing are two different types of drawings used in the field of architecture and engineering section. However, there is a relationship between them as they provide important information about a construction project.

Detail area plan:

A detailed area plan is a type of architectural or engineering drawing that provides an overview of a specific area, such as a building floor, site or landscape. It is a detailed graphical representation that includes all the important information about the area, including the location of walls, doors, windows, and other structural elements.

A detailed area plan can also include information about the materials and finishes to be used in the area, as well as the dimensions and measurements of each element. It is typically used by architects, designers, and engineers to communicate their design ideas to clients, stakeholders, and contractors.

                                                                         Fig: Detail area plan

Working Drawing Plan:

Architectural working drawings are technical drawings created by architects and architectural drafters that provide detailed and precise information about the design of a building. These drawings are used to communicate design specifications and construction details to contractors, builders, and other professionals involved in the construction process.

Architectural working drawings typically include floor plans, elevations, sections, and details. Floor plans show the layout of the building and the location of walls, doors, windows, and other elements. Elevations show the vertical appearance of the building and the location of the doors, windows, and other openings. Sections show a cut-through view of the building, which reveals the interior structure and details. Details provide specific information about the construction and materials used for various building elements, such as the roof, walls, and foundation.

Architectural working drawings serve as a critical communication tool between the design team and the construction team, ensuring that the building is constructed according to the designer’s specifications and requirements. They are also important for obtaining necessary permits and approvals from local authorities and for estimating project costs.

                                                                        Fig: working drawing plan

Relation between detail area plan & working drawing plan:

The detail area plan is a type of drawing that provides detailed information about a specific area or component of a building, while working drawings are a set of technical illustrations that provide precise and accurate information about the design and construction of a building. The detail area plan is typically included as part of the set of working drawings, and it provides a more detailed view of a particular area or feature than is shown in other types of drawings. Both detail area plans and working drawings are important tools for architects and builders, as they provide essential information about the design and construction of a building. 

In summary, the detail area plan is a type of working drawing that provides detailed information about a specific area or feature of the building. It is a component of the set of working drawings that is used to provide precise and accurate information about the design and construction of the building.

                                                                                                                                                            Reference- Google

Writer-

Shanta Islam

Architecture/AIDT Department

Instructor, Daffodil Polytechnic Institute