Nanomechanical characteristics of lightweight aggregate concrete containing supplementary cementitious materials exposed to elevated temperature

2014 ◽  
Vol 51 ◽  
pp. 198-206 ◽  
Author(s):  
V. Zanjani Zadeh ◽  
C.P. Bobko
Keyword(s):  
Elevated Temperature ◽  
Lightweight Aggregate ◽  
Cementitious Materials ◽  
Supplementary Cementitious Materials ◽  
Lightweight Aggregate Concrete ◽  
Aggregate Concrete

scholarly journals Effects of Multiple Supplementary Cementitious Materials on Workability and Segregation Resistance of Lightweight Aggregate Concrete

2018 ◽  
Vol 10 (11) ◽  
pp. 4304 ◽  
Author(s):  
Afonso Solak ◽  
Antonio Tenza-Abril ◽  
José Saval ◽  
Victoria García-Vera
Keyword(s):  
Lightweight Aggregate ◽  
Posidonia Oceanica ◽  
Cementitious Materials ◽  
Supplementary Cementitious Materials ◽  
Mineral Admixtures ◽  
Lightweight Aggregate Concrete ◽  
Aggregate Concrete ◽  
Beneficial Effects ◽  
Binder Ratio ◽  
Different Grain Size

In view of the global sustainable development, it is imperative that supplementary cementing materials (SCM) be used for replacing cement in the concrete industry and several researchers have shown that mineral admixtures can enhance the workability of lightweight aggregate concrete (LWAC) mixture and its strength. In view of the beneficial effects of using SCM in LWAC, this article aims to verify the possible influence of the use of different types of SCM in the segregation phenomenon of LWAC. Three different SCM were studied: Silica Fume (SF), Fly Ash (FA) and Posidonia oceanica Ash (PA). For each SCM, three mixtures were prepared, considering three different percentage substitutions of cement. An image analysis technique was applied to estimate the segregation in each sample. The results show that a substitution of cement by other materials with different grain size, considering a constant water binder ratio, may also result in a variation of the consistency of concrete and the viscosity of the mortar matrix, which may contribute to increase or reduce segregation.

scholarly journals Green and Durable Lightweight Aggregate Concrete: The Role of Waste and Recycled Materials

Materials ◽  
2020 ◽  
Vol 13 (13) ◽  
pp. 3041 ◽  
Author(s):  
Jiyu Wang ◽  
Kai Zheng ◽  
Na Cui ◽  
Xin Cheng ◽  
Kai Ren ◽  
...  
Keyword(s):  
Solid Waste ◽  
Negative Impact ◽  
Lightweight Aggregate ◽  
Cementitious Materials ◽  
Environmental Benefits ◽  
Industrial Wastes ◽  
Lightweight Aggregate Concrete ◽  
Future Research ◽  
Aggregate Concrete ◽  
By Products

Lightweight aggregate concrete manufactured by solid waste or recycled by-products is a burgeoning topic in construction and building materials. It has significant merits in mitigating the negative impact on the environment during the manufacturing of Portland cement and reduces the consumption of natural resources. In this review article, the agricultural and industrial wastes and by-products, which were used as cementitious materials and artificial lightweight aggregate concrete, are summarized. Besides, the mechanical properties, durability, and a few advanced microstructure characterization methods were reviewed as well. This review also provides a look to the future research trends that may help address the challenges or further enhance the environmental benefits of lightweight aggregate concrete manufactured with solid waste and recycled by-products.

scholarly journals Utilization of Cementitious Materials with Cold-bonded Artificial Aggregate in Concrete

2019 ◽  
Vol 9 (1) ◽  
pp. 385-388
Keyword(s):  
Compressive Strength ◽  
Silica Fume ◽  
Lightweight Concrete ◽  
Lightweight Aggregate ◽  
Cementitious Materials ◽  
Lightweight Aggregate Concrete ◽  
Optimum Level ◽  
Aggregate Concrete ◽  
Glass Fibres ◽  
Granulated Blast Furnace Slag

This article investigates the slump and compressive strength of artificial lightweight aggregate concrete with Ground Granulated Blast Furnace Slag (GGBFS) and Silica Fume with glass fibres. The increase in usage of cement in the construction industry is a concern for ecological deterioration, in this view; artificial aggregates was manufactured with major amount of fly ash and replacement of cement with various industrial by-products in concrete. An optimum level of GGBFS from 10 to 50% and Silica Fume from 2 to 6% with addition of glass fibres was assessed based on compressive strength values. The compressive strength was conducted for 7 and 28Days of water curing on M30 grade lightweight concrete with constant water to cement ratio as 0.45 and 0.2% of Master Gelenium super plasticizer. The conclusions achieved from the compressive strength of concrete containing GGBFS and Silica Fume was increased as the curing time increases. As a result lightweight aggregate concrete with a cement content of 226 kg/m3 develops 37.3 N/mm2 compressive strength.

scholarly journals The Effect of Elevated Temperature on the Lightweight Aggregate Concrete

2017 ◽  
Vol 2 (3) ◽  
pp. 193-196
Author(s):  
Rahel Khalid Ibrahim
Keyword(s):  
Elevated Temperature ◽  
Residual Strength ◽  
Elevated Temperatures ◽  
Lightweight Concrete ◽  
Concrete Structures ◽  
Lightweight Aggregate ◽  
Lightweight Aggregate Concrete ◽  
Aggregate Concrete ◽  
Weight Losses ◽  
Before And After

The use of lightweight concrete has become widely spread in concrete structures in the last years. Fire can be considered as a destructive hazard that attack concrete structures. In this research the effect of elevated temperature on lightweight aggregate concretes is studied. For this purpose, 81 cube shaped specimens were prepared from three different lightweight aggregate concrete mixes. After moist curing periods for 3, 7 and28 days, the specimens were subjected to ambient and elevated temperatures of 450⁰C and 650⁰C for 2hrs.The weight of the specimens before and after exposure to elevated temperatures was determined and the residual strength results for the specimens were compared. The results showed that, the elevated temperature induces a decrease in strength and significant weight losses in lightweight aggregate concrete.

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