The Mechanism of Disintegration of Cement Concrete at High Temperatures

Jocius, Vytautas; Skripkiūnas, Gintautas

doi:10.1515/cons-2016-0001

Cited by 4 publications

(4 citation statements)

References 14 publications

(21 reference statements)

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The elevated temperature induced from fire could cause a deterioration of material and mechanical properties of structural members. For lightweight concrete (LWC), expanded clay is a more convenient from others type of aggregate, because it does not deform at high temperatures, and during heating of concrete at high temperature, where this aggregates have lower expansion V. Jocius and G. Skripkiunas [3]. Lightweight aggregate has superior heat stability, lower thermal expansion, and lower thermal conductivity coefficient than normal-weight concrete [4,5].…”

Section: Introductionmentioning

confidence: 99%

Structural behavior of lightweight reinforced concrete columns exposure to eccentric loads at high temperature

Al-Naqeeb

Al-Thairy

2021

QJES

View full text Add to dashboard Cite

This paper presents an experimental investigation on the behavior of six reinforced concrete columns under elevated temperature. An expanded clay aggregate (LECA) was used in three reinforced concrete columns ,other three remain columns used natural aggregate .All RC columns have similar cross sectional dimensions of 150mm ×150 mm (width× height); and 1250mm total length. The columns were designed according to ACI Committee 318-2014 and exposed to different elevated temperatures of 400 oC and500 oC. After exposure to elevated temperature, the columns were axially loaded by compression force using an eccentricity ratio (e/h) equal to 0.5. The experimental test results demonstrated a remarkable decrease in the ultimate carrying capacity of the columns when subjected to elevated temperature. The experimental test results have also revealed that the lightweight reinforced concrete columns have more fire resistance than the normal weight reinforced concrete columns under same elevated temperature. The ultimate load capacity of LWRC columns decreases by about 6.5 % ,and 14.286 %, at elevated temperature magnitude of 400 ºC, and 500 ºC respectively, compared with the control column at ambient temperature. However, the ultimate load capacity of NWRC columns decreases by about 14.15 %,and 28.571 %, at elevated temperature magnitude of 400 ºC, and 500 ºC respectively, compared with the control column at ambient temperature.

show abstract

Section: Introductionmentioning

confidence: 99%

Structural behavior of lightweight reinforced concrete columns exposure to eccentric loads at high temperature

Al-Naqeeb

Al-Thairy

2021

QJES

View full text Add to dashboard Cite

show abstract

“…Calcium and silica determine the concrete strength due to the decomposition when heating at high temperatures [18] [19]. As a result of the decomposition in the lightweight bricks, there was a very drastic decrease in concrete's compressive strength.…”

Section: Decreased Compressive Strength Due To Firementioning

confidence: 99%

Impact of Fire on Mechanical Properties of Lightweight Bricks Containing Calcium Carbide Residue

Rahmawati

Meliyana

Thufaila

et al. 2020

View full text Add to dashboard Cite

Calcium carbide residue is an unutilized by-product. It contains high calcium and can be used to produce cementitious. The variation of Calcium carbide residue used is 0%, 5%, and 15%. This study focused on the reduction of the cement used and lightweight bricks resistance toward the fire condition. Moreover, the tests were carried out by examining the compressive strength before and after lightweight bricks burned, X-ray fluorescence (XRF), Scanning Electron Microscope (SEM), and Fourier-Transform Infrared Spectroscopy (FTIR). The result showed a decrease of compressive strength on 10% and 15% carbide variation. At the combustion temperature of 250 °C, micro-cracking occurred at 0% and 5% carbide specimens, while not only cracking but also spalling and crazing were at the specimens with 10% carbide. The 5% variation of calcium carbide residue can increase the compressive strength and endurance at 250 °C. At the higher temperature, the compressive strength was decreased, and the material was damaged. IR-spectroscopy test results showed that 5% carbide composition achieved the highest compressive strength because the amount of H2O2 used reacts with CaO.

show abstract

“…This research aims to continue research in the field of disintegration product application carried out by Bumanis G., Dvorak K., and others [23][24][25][26] and to fill the gap in long-term property assessment with materials made from disintegration products. Furthermore, the authors aim to determine whether disintegration is a valid procedure that can return activity to old cement and whether cement that has been disintegrated shows any improvement in contrast to old cement.…”

Section: Introductionmentioning

confidence: 99%

Creep and Shrinkage Behaviour of Disintegrated and Non-Disintegrated Cement Mortar

et al. 2021

View full text Add to dashboard Cite

One way to prevent cement from ending up in landfills after its shelf life is to regain its activity and reuse it as a binder. As has been discovered, milling by planetary ball mill is not effective. Grinding by collision is considered a more efficient way to refine brittle material and, in the case of cement, to regain its activity. There has been considerable research regarding the partial replacement of cement using disintegrated cement in mortar or concrete in the past few decades. This article determines and compares the creep and shrinkage properties of cement mortar specimens made from old disintegrated, old non-disintegrated, and new non-disintegrated Portland cement. The tests show that the creep strains for old disintegrated and old non-disintegrated cement mortars are close, within a 2% margin of each other. However, the creep strains for new non-disintegrated cement mortar are 30% lower. Shrinkage for old disintegrated and non-disintegrated cement mortar is 20% lower than for new non-disintegrated cement mortar. The research shows that disintegration is a viable procedure to make old cement suitable for structural application from a long-term property standpoint. Additionally, it increases cement mortar compressive strength by 49% if the cement is disintegrated together with sand.

show abstract

The Mechanism of Disintegration of Cement Concrete at High Temperatures

Cited by 4 publications

References 14 publications

Structural behavior of lightweight reinforced concrete columns exposure to eccentric loads at high temperature

Structural behavior of lightweight reinforced concrete columns exposure to eccentric loads at high temperature

Impact of Fire on Mechanical Properties of Lightweight Bricks Containing Calcium Carbide Residue

Creep and Shrinkage Behaviour of Disintegrated and Non-Disintegrated Cement Mortar

Contact Info

Product

Resources

About