Concrete by Preplaced Aggregate Method Using Silica Fume and Polypropylene Fibres

Preplaced aggregate concrete (PAC) is prepared in two steps, with the coarse aggregate being initially laid down in the formwork, after which a specialised grout is injected into it. To enhance the properties of concrete and to reduce the emission of CO produced during the production of cement, supp...

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Bibliographic Details
Published in:	Materials Vol. 15; no. 6; p. 1997
Main Authors:	Khanzada, Farooq Azam, Nazir, Kashif, Ishtiaq, Muhammad, Javed, Muhammad Faisal, Kashif-Ur-Rehman, Sardar, Aslam, Fahid, Musarat, Muhammad Ali, Usanova, Kseniia Iurevna
Format:	Journal Article
Language:	English
Published:	Switzerland MDPI AG 08-03-2022 MDPI
Subjects:	Aggregates Cement Compressive strength Concrete Concrete aggregates Concrete properties Density Ductility Emissions control Fibers Formwork Grout Mechanical properties Nuclear power plants Polyethylene terephthalate Polypropylene Portland cements Reinforced concrete Silica fume Silicon dioxide Stress-strain curves Substitutes Sustainable development Tensile strength Abbottabad Pakistan Pakistan concrete silica fume polypropylene fibres mass loss preplaced aggregate
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Summary:	Preplaced aggregate concrete (PAC) is prepared in two steps, with the coarse aggregate being initially laid down in the formwork, after which a specialised grout is injected into it. To enhance the properties of concrete and to reduce the emission of CO produced during the production of cement, supplementary cementitious materials (SCMs) are used to partially substitute ordinary Portland cement (OPC). In this study, 100 mm × 200 mm (diameter x height) PAC cylinders were cast with 10 per cent of cement being substituted with silica fume; along with that, 1.5% dosage of Macro polypropylene fibres were also introduced into the coarse aggregate matrix. Compressive strength test, splitting tensile strength test, mass loss at 250 °C, and compressive strength at 250 °C were performed on the samples. PAC samples with 10% of cement replaced with Silica Fume (SPAC) were used as control samples. The primary objective of this study was to observe the effect of the addition of Polypropylene fibres to PAC having Silica fume as SCM (FRPAC). The aforementioned tests showed that FRPAC had a lower compressive strength than that of the control mix (SPAC). FRPAC had greater tensile strength than that of NPAC and SPAC. Mass loss at 250 °C was greater in SPAC compared to FRPAC. The compressive strength loss at 250 °C was significantly greater in FRPAC compared to SPAC. FRPAC exhibited a greater strain for the applied stress, and their stress-strain curve showed that FRPAC was more ductile than SPAC.
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	1996-1944 1996-1944
DOI:	10.3390/ma15061997