scholarly journals Experimental research on mechanical performance of sulphoaluminate cement rapid repair material

2021 ◽  
pp. 193-198
Author(s):  
Y. Liu ◽  
X.J. Huang ◽  
Z.Q. Hou
Keyword(s):  
Experimental Research ◽  
Mechanical Performance ◽  
Repair Material ◽  
Rapid Repair ◽  
Sulphoaluminate Cement

scholarly journals Experimental research on mechanical performance of the lightweight composite slabs

2021 ◽  
Vol 1861 (1) ◽  
pp. 012085
Author(s):  
Ruiyan Cai ◽  
Jingjing Du ◽  
Li Yang ◽  
Chengsheng Pan
Keyword(s):  
Experimental Research ◽  
Mechanical Performance ◽  
Composite Slabs

Setting Behaviour of Phosphate Cement

2011 ◽  
Vol 194-196 ◽  
pp. 853-857
Author(s):  
Zhong Hua Li ◽  
He Fei Gao ◽  
Shu Rong Feng ◽  
Chao Su
Keyword(s):  
Fly Ash ◽  
Portland Cement ◽  
Influencing Factors ◽  
Setting Time ◽  
Repair Material ◽  
Rapid Repair ◽  
Binder Ratio

For the situation that concrete engineering required rapid and timely repair after nature disaster, setting time and influencing factors of phosphate rapid repair material were studied in this paper. The results showed that setting time of phosphate rapid repair material increased a little with increase of water and binder ratio but the setting time was short. When water and binder ratio was less than 0.20 setting time was less than 3min. Setting time was shorted with reducing of P/M. Setting time was from 2min30s to 5min when P/M was reduced from 1:0.6 to 1:4. Setting time of phosphate cement increase a little mixed with fly ash, slag or portland cement but effect of their content on setting time was little. Setting time of phosphate rapid repair material increased with increase of B/M. When content was greated than 12% the setting time was longer than 20min. Fly ash, slag and portland cement can reduce setting time of phosphate cement with borax obviously.

Influences of Microelement on Microstructure and Mechanical Performance of Alite-Strontium Calcium Sulphoaluminate Cement

2010 ◽  
Vol 168-170 ◽  
pp. 466-471 ◽  
Author(s):  
Qiu Ying Li ◽  
Ling Chao Lu ◽  
Shou De Wang
Keyword(s):  
Mechanical Performance ◽  
Sintering Temperature ◽  
Cementitious Material ◽  
Cement Clinker ◽  
Testing Conditions ◽  
Sulphoaluminate Cement ◽  
Portland Cement Clinker ◽  
New Type ◽  
Calcium Sulphoaluminate ◽  
Calcium Sulphoaluminate Cement

Alite-strontium calcium sulphoaluminate cement, a new type of cementitious material, is synthesized by combining strontium calcium sulphoaluminate with minerals of Portland cement clinker. The influences of excessive SO3 and SrO on the microstructure and performances of this cement are studied by XRD, SEM-EDS and lithofacies. The results show that the optimal excessive mass fraction of SO3 and SrO are 50% and 80%. The compressive strength of the cement prepared under the testing conditions reaches to 32.8MPa, 66.8MPa and 126.4MPa at 1d, 3d and 28d curing ages, respectively. The additions of SO3 and SrO are benefit to improve the content of strontium calcium sulphoaluminate, and promote the formation of alite at low sintering temperature.

Study on the Properties of Fiber Reinforced Sulphoaluminate Cement Mortar

2012 ◽  
Vol 446-449 ◽  
pp. 1071-1075
Author(s):  
Zheng Mao Ye ◽  
Qin Yi Wu ◽  
Peng Du ◽  
Xin Cheng
Keyword(s):  
Compressive Strength ◽  
Mass Fraction ◽  
Mechanical Performance ◽  
Cement Mortar ◽  
Wood Fiber ◽  
Polypropylene Fiber ◽  
Drying Shrinkage ◽  
Moisture Loss ◽  
Shrinkage Ratio ◽  
Sulphoaluminate Cement

The effects of wood fiber and polypropylene fiber on the mechanical performance, drying shrinkage and moisture loss of sulphoaluminate cement (SAC) mortar were studied. The experimental results show that wood fiber and polypropylene fiber can both improve the flexural strength of the mortar and reduce drying shrinkage ratio and moisture loss at different ages. Polypropylene fiber can also improve the late compressive strength of the mortar. Adding 0.3% mass fraction of wood fiber, the drying shrinkage ratio and moisture loss of the motar reach minimum values. The drying shrinkage ratio reduces to 0.029% at 28d. Moisture loss reduces to 0.4%. Adding 0.5% mass fraction of polypropylene fiber, the drying shrinkage ratio and moisture loss of the motar also reach minimum values. The drying shrinkage ratio reduces to 0.03% at 28d and moisture loss reduces to 0.39%.

scholarly journals Influence of NaCl Freeze Thaw Cycles and Cyclic Loading on the Mechanical Performance and Permeability of Sulphoaluminate Cement Reactive Powder Concrete

Coatings ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 1227
Author(s):  
Xinghua Hong ◽  
Hui Wang ◽  
Feiting Shi
Keyword(s):  
Cyclic Loading ◽  
Mechanical Performance ◽  
Strength Loss ◽  
Steel Fibers ◽  
Freeze Thaw ◽  
Sulphoaluminate Cement ◽  
Compressive And Flexural Strengths ◽  
Reactive Powder ◽  
Mechanical Strengths ◽  
Curing Age

This paper aimed to investigate the coupling effects of NaCl freeze–thaw cycles and cyclic loading on the mechanical performance and permeability of sulphoaluminate cement reactive powder concrete (RPC). Firstly, the compressive and flexural strengths of sulphoaluminate cement RPC were investigated. Then, the chloride ion permeability, mechanical strengths (compressive and flexural strengths) and mass loss were determined. Results indicated that the increased steel fibers content and curing age played positive roles in the mechanical strengths. The threshold values of steel fibers and curing age were 3.0% and 14 days. Sulphoaluminate cement RPC with early curing age (5 h) showed relatively high mechanical strengths: flexural strength (8.69~17.51 MPa), and compressive strength (34.1~38.5 MPa). The mass loss, the chloride migration coefficient, and the compressive strength loss increased linearly with NaCl freeze–thaw cycles. Meanwhile, the flexural strength loss increased with the exponential function. The relative dynamic modulus of elasticity of specimens decreased linearly with the increased freeze–thaw cycles. Finally, it was observed from this paper, cyclic loading demonstrated negative roles on the mechanical strengths and resistance to chloride penetration.

Experimental Research on the Physi-Mechanical Performances of Geosynthetics

2013 ◽  
Vol 341-342 ◽  
pp. 33-37 ◽  
Author(s):  
Jun Hu ◽  
Hui Zeng ◽  
Xiao Bin Wang
Keyword(s):  
Experimental Research ◽  
Mechanical Performance ◽  
Term Effect ◽  
Influence Of Temperature ◽  
Long Term Effect ◽  
Influence Of Temperature On ◽  
Mechanical Performances ◽  
Better Than

The physi-mechanical performances of geosynthetics were studied by the test on the geosynthetics produced by one factory. Tests of stretching, top-breaking, pierce, tearing, etc. under different materials, temperatures and moistures were done by indoor study, thus studying the physi-mechanical performances of geosynthetics under different conditions. The research shows: the stretching performance of nonwoven textile is better than the woven textile's; The influence of temperature on the geosynthetics is remarkable, it should be emphasized during the construction; The moisture has a little impaction on the mechanical performance of geosynthetics; These achievements provide scientifical data and references for the physi-mechanical performances of geosynthetics, while no further study on the long-term effect, it should be studied in future.

Properties of Phosphate Cement Mortar Used as Rapid-Repair Material

2011 ◽  
Vol 250-253 ◽  
pp. 1752-1756 ◽  
Author(s):  
Hong Wei Deng ◽  
Ying Zi Yang ◽  
Xiao Jian Gao
Keyword(s):  
Compressive Strength ◽  
Fly Ash ◽  
No Reduction ◽  
Cement Mortar ◽  
Magnesium Phosphate ◽  
Strength Development ◽  
Repair Material ◽  
Rapid Repair ◽  
Repair Materials ◽  
Early Strength

In order to determine the optimal proportion of magnesium phosphate cement mortar, the influences of ratio of magnesium phosphate cement-based binder (MPB) to sand (MPB/S), effects of fly ash on fluidity and strength development of MPB mortar, and the compatibility between MPB and traditional concrete and shrinkage of MPB mortar were investigated in this paper. The optimal proportion in this test was: setting adjusting agent of 12%, P/M ratio of 1:2(in weight), MPB/S ratio of 1:1 and FA/S ratio of 15%. The results showed that the MPB mortar met the higher early strength requirement of rapid-repair materials, with compressive strength beyond 50MPa and flexural strength more than 9.1MPa at 3 hours, and at later ages no reduction of strength happened. There was a good compatibility between MPB and traditional concrete. The shrinkage of MPB mortar at 28 days was less than 2.89 × 10-4. Therefore MPB is very suitable for rapid repairing of concrete structures.

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