Results 61 to 70 of about 7,402 (164)

Physicochemical Properties of Hydrated Portland Cement Blended with Rice Husk Ash

Journal of Chemistry, 2020
In the presence of significant quantities of carbon dioxide (CO2) and elevated temperatures in the atmosphere due to climate change, cement-based materials are susceptible to carbonation. Blended cements are more prone to carbonation attack than Portland
Joseph Mwiti Marangu, Cyprian Muturia M’thiruaine, Mark Bediako   +2 more
doaj   +1 more source

A review on carbonation in cement composites and its impacts on durability and potential for CO₂ sequestration

Journal of Materials and Engineering Structures
Carbonation is a key process affecting the durability, strength, and environmental impact of concrete. While it refines pore structure and enhances strength, it also lowers alkalinity, leading to reinforcement corrosion risks.
Aijaz Hussain BHAT, Shashi Kant SHARMA
doaj  

Novel accelerated carbonation methods based on deep breathing analogous and prediction model for pressurized carbonation of concrete

Scientific Reports
This research proposes a novel deep breathing analogy (DBA) accelerated carbonation process. Inspired by the breathing mechanism of human lungs, the DBA method involves injecting pure CO2 into a reaction chamber at a specific pressure (inspiration) and ...
Ray Kai Leung Su, Hao Li, Lijie Chen, Hongniao Chen   +3 more
doaj   +1 more source

Study on the carbonation resistance of sulphoaluminate cement grouting materials enhanced by acrylamide in-situ polymerization modification

Developments in the Built Environment
Sulphoaluminate cement (SAC) is widely used in grouting applications owing to its rapid setting and high early strength. However, its low resistance to carbonation in highCO2 environments restricts its broader application.
Guangling Shi, Hucheng Chai, Liya Zhao, Songhui Liu, Zhiying Guo, Haibo Zhang   +5 more
doaj   +1 more source

Behaviour of supersulfated cements under accelerated and natural carbonation [PDF]

MATEC Web of Conferences
It is known that supersulfated cement (SSC) is susceptible to carbonation; however, there are uncertainties regarding the similarity between accelerated and natural carbonation processes.
Kich De Ré Julia, Sokolovski André Luiz, Angulski da Luz Caroline, Pereira Filho José Ilo   +3 more
doaj   +1 more source

Determination of carbon-carbon connectivities, assignment of quaternary carbons, and extraction of carbon-carbon coupling constants by carbon-relayed hydrogen-carbon spectroscopy

Journal of Magnetic Resonance (1969), 1985
Nowadays many possibilities exist to elucidate carbon-carbon connectivity. In hydrogen-bearing carbon systems C-C connectivities can be traced out most conveniently in an indirect way by a combination of H-H COSY (I) and H-C CQSY (2). In case of overlapping ‘proton signals ambiguities can be removed by heteronuclear relayed spectroscopy (3) and ...
Kessler, Horst, Bermel, W., Griesinger, Christian   +2 more
openaire   +2 more sources

MFRWA: A Multi-Frequency Rayleigh Wave Approximation Method for Concrete Carbonation Depth Evaluation

Buildings
Carbonation depth is essential to determine the durability and predict the remaining service life of concrete structures. This study proposes a multi-frequency Rayleigh wave approximation method (MFRWA) to evaluate carbonation depth by exploiting the ...
Xiangtao Sun, Yongxiang Cui, Jiawei Chen, Shanchang Yi, Xiuquan Li, Lin Chen   +5 more
doaj   +1 more source

Cellulose carbon-CVD carbon composites

Carbon, 1975
Carbon-carbon composites have been fabricated using a cellulose powder which is molded at low pressures, carbonized at 800°C and infiltrated by a CVD technique at 700°C using propylene as a source of carbon. Infiltration rate at time t is governed by the amount of open porosity existing in the sample at this time.
S. Marinkovic, P.W. Whang, A. Navarrete, P.L. Walker   +3 more
openaire   +2 more sources

Carbonization test and orthogonal polynomial regression analysis of steel fiber reclaimed concrete

Heliyon
To enhance the carbonation resistance of reclaimed concrete, several key factors affecting its performance were investigated. An orthogonal array L16(4³ × 2⁶) was employed to design the carbonation tests for steel fiber (SF) reinforced concrete.
Yahong Ding, Zhongcai Lin, Chunling Yan, Biaowei Sang, Longbo Yang   +4 more
doaj   +1 more source

Experimental study on the macroscopic and microscopic properties of cement paste backfill after treatment with carbon dioxide carbonize filling slurries during the mixing process

Journal of Materials Research and Technology
Introducing CO2 during the mixing process of filling slurry for wet carbonation enables simultaneous carbonation and hydration reactions of the carbonated filling slurry (CSL).
Yan Li, Jianxin Fu, Panyin Jing, Jie Wang, Kun Wang   +4 more
doaj   +1 more source