Numerical simulation of microcracking induced by drying shrinkage in early age cement pastes

2019 ◽  
Author(s):  
A Rhardane
Keyword(s):  
Numerical Simulation ◽  
Drying Shrinkage ◽  
Early Age ◽  
Cement Pastes

Numerical Simulation of the Hot Weather on Concrete at Early Age

2016 ◽  
Vol 7 (6) ◽  
pp. 185
Author(s):  
Mouna Barhmi ◽  
M'hammed Merbouh ◽  
Hamid Khachab ◽  
Nabil Bella ◽  
Mohammed El Mir ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Early Age ◽  
Hot Weather

scholarly journals Utilization of Solid Waste from Brick Industry and Hydrated Lime in Self-Compacting Cement Pastes

Materials ◽  
2021 ◽  
Vol 14 (5) ◽  
pp. 1109
Author(s):  
Mati Ullah Shah ◽  
Muhammad Usman ◽  
Muhammad Usman Hanif ◽  
Iqra Naseem ◽  
Sara Farooq
Keyword(s):  
Mechanical Properties ◽  
Solid Waste ◽  
Manufacturing Industry ◽  
Setting Time ◽  
Hydrated Lime ◽  
Pozzolanic Reaction ◽  
Early Age ◽  
Cement Pastes ◽  
Brick Powder ◽  
High Degree

The huge amount of solid waste from the brick manufacturing industry can be used as a cement replacement. However, replacement exceeding 10% causes a reduction in strength due to the slowing of the pozzolanic reaction. Therefore, in this study, the pozzolanic potential of brick waste is enhanced using ultrafine brick powder with hydrated lime (HL). A total of six self-compacting paste mixes were studied. HL 2.5% by weight of binder was added in two formulations: 10% and 20% of waste burnt brick powder (WBBP), to activate the pozzolanic reaction. An increase in the water demand and setting time was observed by increasing the replacement percentage of WBBP. It was found that the mechanical properties of mixes containing 5% and 10% WBBP performed better than the control mix, while the mechanical properties of the mixes containing 20% WBBP were found to be almost equal to the control mix at 90 days. The addition of HL enhanced the early-age strength. Furthermore, WBBP formulations endorsed improvements in both durability and rheological properties, complemented by reduced early-age shrinkage. Overall, it was found that brick waste in ultrafine size has a very high degree of pozzolanic potential and can be effectively utilized as a supplementary cementitious material.

Device for Pore Solution Extraction from Cement-Based Materials and its Application

2016 ◽  
Vol 680 ◽  
pp. 365-369
Author(s):  
Jian Liang Zhang ◽  
An Qun Lu ◽  
Hua Li ◽  
Rui Wang ◽  
Wen Bin Wang ◽  
...  
Keyword(s):  
Chemical Composition ◽  
Pore Solution ◽  
Early Age ◽  
Cement Pastes ◽  
Cement Based Materials ◽  
Different Ages ◽  
Low Rate ◽  
Relevant Factors

In this paper, a device for pore solution extraction from cement-based materials was presented, The relevant Factors of Efficiency of Pore Solution Extraction and the effects of squeezing pressures on the chemical concentrations of pore solutions were studied. The results shows, the efficiency of pore solution extraction can be effected by pressure values, squeezing duration, pressure maintaining time; A low rate of pressures loading is suitable for early-age cement pastes, and long-term samples can take larger rate; 30 minutes loading time can be adopted for specimens with all the different ages; no significant differences were observed regarding the chemical composition (Na and K) of the pore solution extracted between 300 and 900MPa.

EXPOSURE TEST AND NUMERICAL SIMULATION ON THE INFLUENCE OF OUTDOOR WEATHER ACTION ON THE DRYING SHRINKAGE OF CONCRETE

2021 ◽  
Vol 77 (4) ◽  
pp. 134-149
Author(s):  
Keisuke MINOWA ◽  
Takumi SHIMOMURA ◽  
Yuichiro KAWABATA ◽  
Takashi FUJII ◽  
Jun TOMIYAMA
Keyword(s):  
Numerical Simulation ◽  
Drying Shrinkage ◽  
Exposure Test
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