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Article
PROPERTIES OF HIGH PERFORMANCE LIGHTWIGHT CONCRETE MASONRY UNITS MADE WITH SUSTAINABLE AGGREGATE

Authors: Wasan Ismail Khalil --- Hisham Khalid Ahmed --- Zainab Mohammed Ali Hussein
Journal: Journal of Engineering and Sustainable Development مجلة الهندسة والتنمية المستدامة ISSN: 25200917 Year: 2018 Volume: 22 Issue: 2 (part-6) Pages: 74-85
Publisher: Al-Mustansyriah University الجامعة المستنصرية

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Abstract

: As a result of the development in Iraq and the reconstruction of the different buildings, there are construction residues that be assembled in a randomized area of cities where these residues occupy a large area of residential or agricultural areas and pose a danger to the environment and humans, so there has become pressing need to study the environmental impact of construction waste materials and how to recycle and use them in the construction industry in a manner that helps to preserve the environment from pollution and conservation of its natural resources. This investigation includes the production of high performance lightweight concrete sustainable building units containing crushed brick clay resulting from the demolition waste and reconstructive of buildings and manufacture artificial aggregate from waste materials, as coarse lightweight aggregate. These units are features by thermal insulation and lightweight, in addition they are an environmental friendly have low price, which can be used in the implementation of low cost buildings. Two High performance lightweight aggregate concrete mixes were produced, the first concrete mix containing crushed clay brick (mix MBR), and the second concrete mix containing artificial LWA (mix MAR) as coarse LWA. These concrete mixes were used to produce concrete masonry unites (CMUs). High performance lightweight concrete mix containing crushed brick clay has oven dried density of 1930 kg / m 3, thermal conductivity of 1.0849 W / (m. K), and compressive strength of 41 N/ mm2, while concrete mix containing artificial aggregate has oven dried density of 1828 kg/m3, thermal conductivity of 0.9278 W/(m.K), and compressive strength of 47 N/mm2. Two geometrical forms of CMUs with dimensions of 200×200×400 mm were produced, the first one contains spaces less than 25% and the other geometric form contains polystyrene insulation materials. Numerous laboratory tests were carried out on the produced CMUs including, water absorption, density, and compressive strength. The results indicate that these units conforms Iraqi standard requirements No.10771987


Article
Application of Waste Lead Acid Battery Plastic to Produce Lightweight Masonry Units
أستخدام المخلفات البلاستيكية لبطاريات الرصاص الحامضية في أنتاج وحدات بناء خفيفة الوزن

Authors: Suhair K.Al-Hubboubi سهير كاظم الحبوبي --- Duaa E. Aljubori دعاء عيدان الجبوري --- Abeer I. Alwared عبير ابراهيم الورد
Journal: Journal of Engineering مجلة الهندسة ISSN: 17264073 25203339 Year: 2019 Volume: 25 Issue: 4 Pages: 90-104
Publisher: Baghdad University جامعة بغداد

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Abstract

The concrete industry consumes millions of tons of aggregate comprising of natural sands and gravels, each year. In recent years there has been an increasing trend towards using recycled aggregate to save natural resources and to produce lightweight concrete. This study investigates the possibility of using waste plastic as one of the components of lead-acid batteries to replace the fine aggregate by 50 and 70% by volume of concrete masonry units. Compared to the reference concrete mix, results demonstrated that a reduction of approximately 32.5% to 39.6% in the density for replacement of 50% to 70% respectively. At 28 days curing age, the compressive strength was decreased while the water absorption increased by increasing waste plastic percentage. The leaching test revealed that lead ion extracted from the WLABP-modified concrete was within the acceptable limits. The findings of this study indicated a sustainable alternative solution for reducing the effects on the environment posed by waste plastic from lead-acid batteries.

تحتاج صناعة الخرسانة إلى ملايين الأطنان سنويا من الركام بما في ذلك الرمال الطبيعية والحصى.و في السنوات الأخيرة كان هناك اتجاه متزايد نحو استخدام الركام المعاد تدويره لحفظ الموارد الطبيعية وإنتاج الخرسانة خفيفة الوزن.تبحث هذه الدراسة في إمكانية استخدام نفايات البلاستيك كأحد مكونات بطاريات الرصاص الحامضية لتحل محل الركام الناعم بنسبة 50٪ و 70٪ من حجم وحدات البناء الخرسانية. مقارنةً بمزيج الخرسانة الاساسية ، أظهرت النتائج أن هناك انخفاض بنسبة 32.5٪و 39.6٪ في الكثافة عند استخدام 50٪ و 70٪ على التوالي. كما توصلت النتائج الى انه في عمر المعالجة 28 يومًا ، تنخفض قوة الانضغاط بينما يزداد امتصاص الماء بزيادة نسبة استبدال البلاستيك كما كشف اختبار النضوح أن أيون الرصاص المستخلص من الخرسانة المعززة WLABP كان ضمن الحدود المقبولة. وتمثل نتائج هذه الدراسة حل بديل مستدام للحد من الآثار التي تشكلها النفايات البلاستيكية المتخلفة من البطاريات على البيئة.

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