Eco-efficient alkali-activated cement based on red clay brick wastes suitable for the manufacturing of building materials

2017 ◽  
Vol 166 ◽  
pp. 242-252 ◽  
Author(s):  
Rafael Andres Robayo-Salazar ◽  
Johanna Mercedes Mejía-Arcila ◽  
Ruby Mejía de Gutiérrez
Keyword(s):  
Building Materials ◽  
Clay Brick ◽  
Red Clay ◽  
Red Clay Brick ◽  
Alkali Activated ◽  
Alkali Activated Cement

scholarly journals Natural radioactivity and radiological hazard of red-clay brick produced in Shangluo, China

2020 ◽  
Vol 35 (4) ◽  
pp. 347-353
Author(s):  
Sukai Zhuang ◽  
Xinwei Lu
Keyword(s):  
Building Materials ◽  
Natural Radionuclides ◽  
Hazard Index ◽  
Radiation Hazard ◽  
Radiological Hazard ◽  
Clay Brick ◽  
Red Clay ◽  
Clay Bricks ◽  
Activity Concentrations ◽  
Red Clay Brick

The radiological hazard of building materials originating from clay, rock and other mineral wastes has attracted more attention because they contain natural radionuclides (226Ra, 232Th, and 40K). The activity concentration of radionuclides in red-clay brick samples obtained from three different brickyards in Shangluo, China waHs measured. Various indexes, including radium equivalent activities, Raeq, external hazard index, Hex, internal hazard index, Hin, indoor air absorbed dose rate, D, and annual effective dose, AED, of the aforementioned radionuclides in the bricks were used to assess the radiation hazard for people. The average activity concentrations of 226Ra, 232Th, and 40K were respectively 34.5 ? 1.9, 62.5 ? 2.1, and 713.7 ? 19.8 Bqkg?1 for the studied red-clay bricks. The Raeq values of the red-clay brick samples varied from 167.0 to 184.7 Bqkg?1, which are lower than the limit of 370 Bqkg?1. Moreover, the activity concentrations of natural radionuclides in unfired brick, clay and coal were also determined and the results were compared with that in the red-clay brick samples. This study shows that the red-clay bricks produced in Shangluo, China can be used safely in construction industries.

scholarly journals Properties and microstructure of alkali-activated red clay brick waste

2013 ◽  
Vol 43 ◽  
pp. 98-106 ◽  
Author(s):  
L. Reig ◽  
M.M. Tashima ◽  
M.V. Borrachero ◽  
J. Monzó ◽  
C.R. Cheeseman ◽  
...  
Keyword(s):  
Clay Brick ◽  
Red Clay ◽  
Red Clay Brick ◽  
Alkali Activated

Improving Alkali-Activated Binders Based on Red Clay Brick Waste with the Incorporation of Sugar Cane Straw Ash

2021 ◽  
Author(s):  
João Pedro Bittencourt Batista ◽  
Maria Júlia Bassan de Moraes ◽  
Mauro Mitsuuchi Tashima ◽  
Jorge Luís Akasaki ◽  
Jordi Payá ◽  
...  
Keyword(s):  
Sugar Cane ◽  
Clay Brick ◽  
Red Clay ◽  
Red Clay Brick ◽  
Alkali Activated Binders ◽  
Alkali Activated ◽  
Straw Ash

Alternative cements based on alkali-activated red clay brick waste

2016 ◽  
Vol 128 ◽  
pp. 163-169 ◽  
Author(s):  
Rafael A. Robayo ◽  
Alexandra Mulford ◽  
Jorge Munera ◽  
Ruby Mejía de Gutiérrez
Keyword(s):  
Clay Brick ◽  
Red Clay ◽  
Red Clay Brick ◽  
Alkali Activated

scholarly journals Influence of different sources of coal gangue used as aluminosilicate powder on the mechanical properties and microstructure of alkali-activated cement

2019 ◽  
Vol 69 (336) ◽  
pp. 199 ◽  
Author(s):  
B. J. Frasson ◽  
R. C.A. Pinto ◽  
J. C. Rocha
Keyword(s):  
Mechanical Properties ◽  
Coal Mining ◽  
Building Materials ◽  
Mechanical Performance ◽  
Pulse Velocity ◽  
Coal Gangue ◽  
Microstructural Development ◽  
Mining Wastes ◽  
Alkali Activated ◽  
Alkali Activated Cement

Coal mining wastes are associated with serious environmental problems; they have potential as building materials, including alkali-activated cement. In this study, the effect of different coal mining wastes on the mechanical properties and microstructural development of alkali-activated materials (AAMs) was evaluated through XRD, SEM and FTIR spectroscopy. Different alkali-activated compounds were produced; the alkaline solution was composed of NaOH+Na2SiO3. The results obtained using the calcined coal sludge showed excellent mechanical performance, with compressive strength higher than 60 MPa. However, addition of metakaolin and ordinary Portland cement was necessary to increase the mechanical performance of calcined coal gangue materials. The formation of N-A-S-H gel and the incorporation of iron ions into the cementitious matrix were evidenced. Ultrasonic pulse velocity indicated the early polymerization during the reaction processes. The study verified that the different characteristics of the wastes influence the performance of alkali-activated materials.

scholarly journals Strength Development and Pore Structure Characterisation of Binary Alkali-activated Binder Based on Tungsten Mining Waste

2020 ◽  
Author(s):  
Naim Sedira ◽  
João Castro-Gomes
Keyword(s):  
Compressive Strength ◽  
Pore Structure ◽  
Mining Waste ◽  
Strength Development ◽  
Red Clay ◽  
Alumino Silicate ◽  
Red Clay Brick ◽  
Electric Arc Furnace Slag ◽  
Furnace Slag ◽  
Alkali Activated

The mineralogical properties of tungsten mining waste mud (TMWM) make its valorisation and re-usage as an alumino-silicate source material to produce an alkali-activated binder without calcination is a challenge. Moreover, the dissolution of silicate and alumina species from TMWM is very slow. Despite the crystallinity of TMWM, this study demonstrates that its combination with other sources of the alumino-silicate source was the materials–such as red clay brick waste(RCBW),ground granulated blast furnace slag (GGBFS) and electric arc furnace slag (EAFS) – improved the compressive strength and the pore structure of the alkali-activated matrix.Thecombinedprecursors (90 vt.%TMWM+10 vt.%RCBW, 90 vt.%TMWM+10 vt.%GGBFS, and 90 vt.%TMWM+10 vt.%EAFS) were activated using a combination of alkaline activator solutions (sodium silicate and sodium hydroxide) with the ratio of 1:3(66.6wt.%sodiumsilicatecombined with 33.33 wt.% of NaOH 10M). The results show that the compressive strength increased from11.23MPa at 28 days to reach 24.98MPawhentheTMWMwaspartially replacedby10vt.%RCBW. In addition,this study shows that the interconnected porosity decreased where the critical pore size was reduced from 21.28 µm to 0.55 µm for the tungsten mining waste-based alkali-activated binder and the binary alkali-activated binder based on TMWM and RCBW. Keywords: Mining Waste, Alkali-activated, Microstructure, MIP, Metakaolin

Resistance of red clay brick waste/phosphorus slag-based geopolymer mortar to acid solutions of mild concentration

2021 ◽  
Vol 34 ◽  
pp. 102066
Author(s):  
Mostafa Vafaei ◽  
Ali Allahverdi ◽  
Peng Dong ◽  
Nabil Bassim ◽  
Mostafa Mahinroosta
Keyword(s):  
Acid Solutions ◽  
Clay Brick ◽  
Red Clay ◽  
Red Clay Brick
Sign in / Sign up

Export Citation Format

Share Document