Effects of elevated temperature on compressive strength and weight loss of the light-weight concrete with silica fume and superplasticizer

2008 ◽  
Vol 30 (8) ◽  
pp. 715-721 ◽  
Author(s):  
Emre Sancak ◽  
Y. Dursun Sari ◽  
Osman Simsek
Keyword(s):  
Weight Loss ◽  
Compressive Strength ◽  
Elevated Temperature ◽  
Silica Fume ◽  
Light Weight ◽  
Light Weight Concrete

Mechanical Properties of Concrete with Aggregate Type at Elevated Temperature

2011 ◽  
Vol 311-313 ◽  
pp. 1840-1846 ◽  
Author(s):  
Tae Gyu Lee ◽  
Gyu Yong Kim ◽  
Young Sun Kim ◽  
Gyu Yeon Park
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Elevated Temperature ◽  
Elevated Temperatures ◽  
Research Effort ◽  
Thermal Strain ◽  
Normal Weight ◽  
Light Weight ◽  
Normal Weight Concrete ◽  
Light Weight Concrete

This research effort aims to evaluate the mechanical properties of concrete with two aggregate type, light weight and normal weight at elevated temperatures. To understand the mechanical properties at elevated temperature, normal and light weight concrete of 60 MPa grade was exposed to temperature range 20 to 700°C under 0%, 20%, 40% load conditions and compressive strength, elastic modulus, thermal strain and transient creep at target temperature were inspected. Experimental results show that light weight concrete has higher compressive strength, although the strength of normal weight concrete degenerated more sharply than the light weight concrete at elevated temperature. Moreover, the thermal strain (0% unstressed) and total strain (20%, 40% stressed) of normal weight concrete was higher than that of light weight concrete. Loading conditions significantly influenced the mechanical properties of normal weight concrete compared to that of light weight concrete at high temperature.

scholarly journals Feasibility study of compost as a partial substitute for fine aggregate in concrete

2021 ◽  
Keyword(s):  
Weight Loss ◽  
Compressive Strength ◽  
Elevated Temperature ◽  
Fine Particles ◽  
Strength Loss ◽  
Fine Aggregate ◽  
Geopolymer Concrete ◽  
Control Specimen ◽  
Sem Image ◽  
Significant Difference

Abstract In this study, vermicompost is replaced for fine aggregate in geopolymer concrete (GPC). Initially mix design is made for GPC and mix proportion is proposed. The vermicompost is replaced at 5%, 10%, 15% and 20% with M sand in GPC. Result indicates the 5% replacement with vermicompost based geopolymer concrete (GPVC) has the compressive strength of 32 N mm−2 (M30 grade) whereas the compressive strength of control specimen made with GPC is 37 N mm−2. Other replacement shows 21 N mm−2, 14 N mm−2 and 11 N mm−2 respectively. The 5% replaced concrete cubes and control specimen are tested at an elevated temperature of 200°C, 400°C, 600°C and 800°C and compared with the control specimen. There is no significant difference observed in weight lost at control (GPC) and GPVC specimen. An elevated temperature, the weight loss is almost 4% at 200°C because of expulsion of water from the concrete. Afterwards only 2% weight loss is observed in remaining elevated temperature. The compressive strength loss is observed at an elevated temperature in GPC and GPVC specimen because of thermal incompatibility between aggregate and the binder. EDX results show M sand and compost contains Si, Al, C, Fe, Ca, Mg, Na and K and it is similar in the elemental composition and SEM image confirms vermicompost contains fine particles.

scholarly journals Assessment the thermal properties lightweight concreteproduced by using local industrial waste materials

2018 ◽  
Vol 162 ◽  
pp. 02027
Author(s):  
Osama AbdulAmeer
Keyword(s):  
Thermal Conductivity ◽  
Tensile Strength ◽  
Compressive Strength ◽  
Thermal Properties ◽  
Industrial Wastes ◽  
Fine Aggregate ◽  
Light Weight ◽  
Wood Sawdust ◽  
Flexural Tensile Strength ◽  
Light Weight Concrete

In this research study of the thermal properties of light weight concrete produced from using two locally industrial wastes materials, to evaluate the thermal insulation, and some physical properties like strength of concrete (compressive and flexural tensile strength and variation of density of light weight concrete. Two types of wastes admixtures were used in this study, (chopped rubber, and wood sawdust) with (5%, 10%, 15% and 20%) percent of each one. Thermal conductivity, compressive strength, flexural tensile strength and variation of density have been examined for each specimen at all percentages of admixtures, and compare with the reference concrete specimens. Experimental test results indicated that using these types of wastes as replacement of fine aggregate in concrete significantly affects the thermal conductivity, compressive strength, flexural tensile strength (rise or fall out), especially at (5%) of adding materials, as well as utilization of additives in concrete to produce low density mixture with wood sawdust or as high density concrete when using rubber chopped in the concrete mixture.

scholarly journals Evaluation of the Effect of Silica Fume on Amorphous Fly Ash Geopolymers Exposed to Elevated Temperature

2021 ◽  
Vol 7 (1) ◽  
pp. 9
Author(s):  
Ong Huey Li ◽  
Liew Yun-Ming ◽  
Heah Cheng-Yong ◽  
Ridho Bayuaji ◽  
Mohd Mustafa Al Bakri Abdullah ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Compressive Strength ◽  
Elevated Temperature ◽  
Fly Ash ◽  
Silica Fume ◽  
Room Temperature ◽  
Lower Degree ◽  
Crystalline Phases ◽  
Alkali Activator

The properties of amorphous geopolymer with silica fume addition after heat treatment was rarely reported in the geopolymer field. Geopolymer was prepared by mixing fly ash and alkali activator. The silica fume was added in 2% and 4% by weight. The geopolymer samples were cured at room temperature for 28 days before exposed to an elevated temperature up to 1000 °C. The incorporation of 2% silica fume did not cause significant improvement in the compressive strength of unexposed geopolymer. Higher silica fume content of 4% reduced the compressive strength of the unexposed geopolymer. When subjected to elevated temperature, geopolymer with 2% silica fume retained higher compressive strength at 1000 °C. The addition of silica fume in fly ash geopolymer caused a lower degree of shrinkage and expansion, as compared to geopolymer without the addition of silica fume. Crystalline phases of albite and magnetite were formed in the geopolymer at 1000 °C.

scholarly journals The Compressive Strength of Light Weight Concrete

2020 ◽  
Vol 12 (4) ◽  
Author(s):  
J.E.O. Ovri ◽  
E.O. Okereke
Keyword(s):  
Compressive Strength ◽  
Lightweight Concrete ◽  
Palm Kernel ◽  
Light Weight ◽  
Palm Kernel Shell ◽  
Light Weight Concrete ◽  
Periwinkle Shell

The compressive strength of lightweight concrete using palm kernel shell (pks) and periwinkle shell (pws) is reported. The strength as a function of aggregates ,age, and density were investigated. The strengths were measured at interval of 7-day for 28 days. The strengths obtained were in the range of those reported in the standards for lightweight concretes. The densities were also observed to increase with age and fall within the range of those reported in the literature. The results for the compressive strength showed that the strength increases with age for both aggregates.

Properties of Light Weight Concrete Containing Crumb Rubber Subjected to High Temperature

2016 ◽  
Vol 718 ◽  
pp. 177-183 ◽  
Author(s):  
Tanapan Kantasiri ◽  
Pornnapa Kasemsiri ◽  
Uraiwan Pongsa ◽  
Salim Hiziroglu
Keyword(s):  
Compressive Strength ◽  
High Temperature ◽  
Strength Loss ◽  
Crumb Rubber ◽  
Unit Weight ◽  
Light Weight ◽  
Cement Ratio ◽  
Light Weight Concrete ◽  
Temperature Exposure ◽  
Light Weight Aggregate

In this study, the compressive strength, unit weight and chemical structure of light weight concrete (LWC) containing crumb rubber after exposure to high temperature are investigated. The crumb rubber was used as light weight aggregate in place of normal aggregate at the content of 3-15 wt% of LWC. For all mixtures, the water/cement ratio and sand/cement ratio were fixed at 0.5 and 0.2, respectively. The experimental results showed that the unit weight of LWC containing crumb rubber decreased with increasing crumb rubber content. The unit weight and compressive strength values are in range of 1566-1761 kg/m3, 12-29 MPa, respectively. The LWCs containing 3-7 wt% and 15 wt% crumb rubber can meet the requirement of ASTM standards for structural light weight concrete and masonry, respectively. After high temperature exposure, the unit weight loss and compressive strength loss were 25% and 75%, respectively. All specimens still complied with the requirement of ASTM standard for masonry.

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