Effect of Molding Method on the Properties of Prepared Quartz Sand Sintered Brick Using the River Sand

2018 ◽  
Vol 279 ◽  
pp. 261-265 ◽  
Author(s):  
Mei Hua Chen ◽  
Yan Yang ◽  
Wang Chen ◽  
Jie Guang Song ◽  
Yue Liu ◽  
...  
Keyword(s):  
Compressive Strength ◽  
Quartz Sand ◽  
Molding Pressure ◽  
Low Grade ◽  
Land Resource ◽  
River Sand ◽  
Cost Performance ◽  
Molding Method ◽  
The Difference ◽  
Press Molding

In order which aim to save land resource and use low grade nature resource to realize high cost performance product. In this paper, the molding method of quartz sand fired brick is discussed. As the plastic (hand pressing) is only used to manually beat the mud mass, the sludge is squeezed by hand. Into the mold and molding and cold isostatic pressure molding pressure of 100 MPa, The difference is far away, which makes the gaps between the particles close to each other greatly different, the pressure of hand-press molding is small, the voids in the blank after molding are large and the hole diameter is large, and the green compact density of the brick body is small. The compact densities of the 65MPa and 150MPa pressed brick bodies are all lower than 100MPa, but 150MPa is still denser than 65MPa. The compressive strength is first increased and then decreased with increasing the molding pressure, when the pressure is 100 MPa, the maximum compressive strength is achieved at 100 MPa achieves the highest point.

Effects of molding on property of thermally conductive and electrically insulating polyamide 6–based composite

2018 ◽  
Vol 32 (9) ◽  
pp. 1190-1203 ◽  
Author(s):  
Xuping Yang ◽  
Wenbin Yang ◽  
Jinghui Fan ◽  
Juying Wu ◽  
Kai Zhang
Keyword(s):  
Thermal Conductivity ◽  
Tensile Strength ◽  
Injection Molding ◽  
Annealing Time ◽  
Polyamide 6 ◽  
Molding Pressure ◽  
Hot Press ◽  
Molding Method ◽  
Thermally Conductive ◽  
Press Molding

Thermally conductive and electrically insulating polyamide 6 (PA6) matrix quaternary composites were prepared by hot press molding and injection molding, respectively. The quaternary composites were composed of zero-dimensional aluminum oxide particle, one-dimensional silicon carbide whisker, two-dimensional flake graphite, and PA6 resin matrix. Morphology, structure, density, thermal conductivity, volume electrical resistivity, and tensile strength of two types of composites were characterized by scanning electron microscopy, X-ray diffractometer, thermal conductivity tester, high resistance micro-current tester, and tensile tester. The results showed that crystallinity, thermal conductivity, density, and tensile strength of hot press molding samples were superior to those of samples made by injection molding method. This is due to that hot press molding method can provide higher molding pressure and longer annealing time than injection molding. The mechanism could be explained that the performances of the composites were promoted by increasing molding pressure and annealing time.

Effect of Control Technology on Properties of Quartz Porous Brick

2018 ◽  
Vol 777 ◽  
pp. 564-568 ◽  
Author(s):  
Long He ◽  
Jin Shi Li ◽  
Mei Hua Chen ◽  
Yan Yang ◽  
Xin Peng Lou ◽  
...  
Keyword(s):  
Compressive Strength ◽  
Quartz Sand ◽  
High Performance ◽  
Performance Test ◽  
Holding Time ◽  
Raw Material ◽  
Process Conditions ◽  
Low Grade ◽  
Sintering Process ◽  
Foaming Agent

A high-performance quartz sand insulation brick was prepared by using low grade quartz sand under different sintering process conditions. The optimum sintering process conditions were obtained by analyzing the relationship between microstructure and sintering process. Through the compounding, pulping, forming, drying and sintering processes, and the performance test of the porous brick, the following conclusions can be drawn, the comprehensive performance in all aspects, the porosity is similar, the preferred high compressive strength conditions, in order to get a best The bonding point, brick body sintering temperature of 1150 °C, porosity of 74.56%, compressive strength of 2.1 MPa of porous brick, and the pores are smooth, more uniform distribution. With the prolonging of the holding time, the porosity of the porous brick is reduced, and the performance is 1h, the porosity is 77.22% and the compressive strength is 2.05 MPa. When the raw material ratio is 60% quartz sand, 30wt% kaolin, calcium carbonate 9.6wt%, foaming agent 0.4wt%, water ratio 0.9 holding time at 1h sintering at 1150°C can get better porosity and compressive strength of the insulation brick. The porous material was sintered at 1150 °C, the content of foaming agent was 0.2wt%, the ratio of water to material was 0.9, and the compressive pressure and porosity were the better.

Effect of Maitenance Technology on the Properties of Quartz Sand Unfired Porous Materials

2014 ◽  
Vol 633 ◽  
pp. 295-298
Author(s):  
Jie Guang Song ◽  
Fang Wang ◽  
Xiu Qin Wang ◽  
Ming Han Xu ◽  
Da Ming Du ◽  
...  
Keyword(s):  
Compressive Strength ◽  
Porous Materials ◽  
Quartz Sand ◽  
High Performance ◽  
Raw Material ◽  
Low Grade ◽  
Insulating Materials ◽  
The Third ◽  
Quartz Sands

The low grade quartz sands is the main raw material to prepare the unfired porous brick through adjusting the maitenance technology. The compressive strength of brick is higher with the maitenance temperature for 40¡æ. The compressive strength of brick is higher with the longer maitenance time. The high performance brick is prepared via the third technology, the pore of brick is more and uniform, it is bowl shape, that is close pore, which provide the reference for preparing the heat insulating materials. The compressive strength of brick is 1.9MPa, the density is 0.628 g/cm3.

Effect of Ball Milling Rotate Speed on the Properties of Quartz Sand Powder Materials

2013 ◽  
Vol 432 ◽  
pp. 47-50
Author(s):  
Zhi Wen Wang ◽  
Zhi Wen Qiu ◽  
Yan Ping Feng ◽  
Ting Ting Xie ◽  
Jin Yun Chen ◽  
...  
Keyword(s):  
Ball Milling ◽  
Quartz Sand ◽  
Milling Time ◽  
Raw Materials ◽  
Powder Materials ◽  
Low Grade ◽  
Cost Performance ◽  
Milling Method ◽  
Vibration Compaction ◽  
Ball Milling Time

In order to lay raw materials foundation for increasing the performance of insulating brick with the low grade quartz sand along the Yangtze River, the effect of ball milling time on the properties of quartz sand powder was researched via the ball milling method in this paper. The results show the grain diameter of quartz sand powder is gradually decreased, the grain fineness distribution is tapered narrowing. The liquidity of quartz sand powders is became poor with an increaseding the ball milling rotate speed, howerver, the tendency of variation is gradually relaxative. The vibration compaction density is decreased with an increaseding the ball milling rotate speed, but the fall amplitude difference is gradually shrinked. The ball milling rotate speed for 250r/min is better through the whole cost performance analysis.

scholarly journals Effect of Addition of Alccofine on the Compressive Strength of Cement Mortar Cubes

2021 ◽  
Vol 5 (2) ◽  
pp. 155-170
Author(s):  
Balamuralikrishnan R. ◽  
Saravanan J.
Keyword(s):  
Compressive Strength ◽  
Cement Mortar ◽  
River Sand ◽  
Mix Proportion ◽  
Strength Tests ◽  
The Difference ◽  
Glass Wastes ◽  
Cement Strength ◽  
Modern Era

In the modern era, many research works are going on throughout the world for finding suitable cementitious material for the replacement of cement since it causes environmental pollution. In this order Fly ash, Silica fume, GGBS, Metakaolin, Micro materials, Quartz powder, etc. are tried out for replacing partially or fully the cement in concrete. A new ultrafine material called Alccofine (AF) which is manufactured from glass wastes is tried out for replacing partially in this research. Compressive strength is one of the important properties of cement. Strength tests are not made on neat cement paste because of difficulties of excessive shrinkage and subsequent cracking of neat cement. Cement mortar of 1:3 mix proportion is used to cast the cubes having an area of 50 cm2 are used for the determination of compressive strength of cement as per IS: 4031-1988 (Part-6). The graded Indian Standard sand (Ennore Sand -ES) confirming to IS: 650-1991 is used for preparing the cubes. In the same mix proportion, the same size cubes are cast with the River Sand (RS) to study the difference of the compressive strength between the Indian standard sand and river sand. Ordinary Portland cement (OPC) and Portland Pozzolana Cements (PPC) are used. The present study is the influence of Alccofine on cement mortar cubes by replacing the cement by Alccofine with various proportions like 5%, 10%, 15%, 20% were cast and tested in the laboratory as per Indian Standard 4301-1988 (Part-6) and the results were analysed and presented in the form of charts and graphs. It is observed that the early age strength is obtained for all the combinations but 10 percent of Alccofine yields more strength than other dosages. Doi: 10.28991/esj-2021-01265 Full Text: PDF

Effect of Sintering Method on the Properties of Quartz Porous Ceramics

2017 ◽  
Vol 381 ◽  
pp. 52-56
Author(s):  
Xue Yang ◽  
Jin Shi Li ◽  
Mei Hua Chen ◽  
Xian Jie Zhou ◽  
Xiao Hui Lai ◽  
...  
Keyword(s):  
Compressive Strength ◽  
Quartz Sand ◽  
High Performance ◽  
Porous Ceramics ◽  
Homogeneous Distribution ◽  
Low Grade ◽  
Vacuum Sintering ◽  
Good Shape ◽  
Sintering Method ◽  
Technology Foundation

The sintering methods of quartz sand porous ceramics were researched with the low grade quartz sand along the Yangtze River via the vacuum sintering method in this paper, which lay technology foundation for researching new heat insulating materials. The quartz porous ceramics is obtained with the high performance cost, the quartz porous ceramics is sintered at 1050°C via the vacuum conditions, the density of ceramics is 1.267g/cm3, the porosity is 51.6%, the compressive strength is 3.184MPa, the porous ceramics show the homogeneous distribution micro-pore and good shape. The density and the compressive strength of prepared ceramics via the vacuum sintering both are higher than that of prepared ceramics via the atmosphere sintering, however, the porosity is shown the opposite results.

Effect of Molding Processing on Properties of YAG Porous Ceramics via Dry Pressing Molding Method

2018 ◽  
Vol 934 ◽  
pp. 134-139 ◽  
Author(s):  
Chang Ming Wu ◽  
Yan Yang ◽  
Hui Min Sun ◽  
Da Deng ◽  
Mei Hua Chen ◽  
...  
Keyword(s):  
Compressive Strength ◽  
Mechanical Strength ◽  
Porous Materials ◽  
Dwell Time ◽  
Porous Ceramic ◽  
Porous Ceramics ◽  
Molding Pressure ◽  
Molding Method ◽  
Pressure Time ◽  
Dry Pressing

YAG materials have a number of unique properties, the application is very extensive. In order to improving the properties of YAG porous materials, the effect of forming processing on the properties of YAG porous ceramics is investigated. Through the results and analysis, the conclusions showed that the porosity of YAG porous ceramics gradually decreased with the molding pressure increases, and the compressive strength of YAG porous ceramics shows a rising trend. The size and number of pores in the microstructure are reduced with increasing the forming pressure, there are inherently many voids in the YAG porous ceramics body at low forming pressures. The porosity of YAG porous ceramic decreases with the increase of dwell time, however, the process of extending from 5 min to 10 min is much faster than the rate of descending from 10 min to 15 min. The size and number of pores in the microstructure are reduced with extending the holding pressure time, which also makes YAG porous ceramics pose the higher mechanical strength. Through the analysis of the results, when the forming pressure is 10MPa, the porosity of YAG porous ceramics is 41.11% and the compressive strength is 5.8MPa, the porosity and compressive strength of YAG porous ceramics is better.

scholarly journals Comparative Effect of Grinded and Ungrinded Palm Kernel Shell on the Strength of Pavers

2021 ◽  
Vol 11 (3) ◽  
Author(s):  
Aluko, K.A ◽  
Elesho, R.O ◽  
Aderemi, A.M. ◽  
Adedipe, J.O. ◽  
Adewoye, A.A ◽  
...  
Keyword(s):  
Compressive Strength ◽  
Analysis Of Variance ◽  
Palm Kernel ◽  
Strength Properties ◽  
Comparative Effect ◽  
River Sand ◽  
Palm Kernel Shell ◽  
Stone Dust ◽  
Significant Difference ◽  
The Difference

Paving stones are increasing, being used by corporate bodies and individual for its functionalities and aesthetic value, the production of pavers over the years have been specifically carried out using stone dust which is relatively expensive and not readily affordable to the common man. This study was carried out to determine comparative effect of grinded and un-grinded palm kernel shell on the strength of pavers. Stone dust, river sand, grinded palm kernel shell, un-grinded palm kernel shell and cement were combine in different ratio namely,T1(4,0,0,0,l), T2(0,2,2,0,l), T3 (1,2,0,1,1), T4(1,1,2,0,l), T5(1,1,0,2,l), T6(0,2,l ,l,1) respectively to form six treatment with two replicates. The pavers were tested for weight and strength properties, T3 has the highest value of the mean weight while T1 has the lowest value. T3 (stone dust (1),river sand (2), un-grinded palm kernel shell (1) and 25kg of cement (1)), T1(stone dust (4) and 25kg of cement (1)).Also, the compressive strength results show that T3 also has the highest value of 127Mpa(Mega pascal) whileT6 has the lowest value of 33Mpa (Mega pascal). The data collected was subjected to analysis of variance (ANOVA) to determine the difference in the strength of the pavers. The analysis of variance shows that there is no significant difference between the compressive strength of the treatments. The colour of the paver shows that the paver produced with river sand and un-grinded palm kernel shell is brighter and stronger than others, it is then recommended that T3 can be used in the production of pavers because it is strong and can also withstand environmental stress.

Dynamic Scintigraphy of the Oesophagus in the Evaluation of Reflux Oesophagitis

1990 ◽  
Vol 29 (05) ◽  
pp. 204-209
Author(s):  
B. Ugarković ◽  
D. Ivančević ◽  
D. Babić ◽  
Ž. Babić
Keyword(s):  
Reflux Oesophagitis ◽  
Oesophageal Reflux ◽  
Low Grade ◽  
Time Activity ◽  
The Difference ◽  
Asymptomatic Subjects ◽  
Oesophageal Transit ◽  
Dynamic Scintigraphy ◽  
Positive Results ◽  
Reflux Œsophagitis

A method is presented which combines gastro-oesophageal reflux quantification and oesophageal transit measurement so as to differentiate true reflux from residual oesophageal activity. A group of 33 subjects with gastro-oesophageal reflux symptoms and endoscopically confirmed reflux oesophagitis and a group of 21 asymptomatic subjects with normal oesophageal, gastric and duodenal endoscopic findings were examined. The subjects were given 37 MBq 99mTc-Sn-colloid in saline orally and then scintiscanned dynamically. The gastro-oesophageal quantification was done after transit measurement and after the oesophageal time activity (to detect residual oesophageal activity) reached its minimum. The difference in the reflux indices between the two groups was highly significant. In low-grade oesophagitis measured reflux was lower than in higher grades of disease. Only 4.7% false-positive results were observed with a specificity of 95%, indicating that this method may be superior to methods published earlier.

scholarly journals Combined Influence of Low-Grade Metakaolins and Natural Zeolite on Compressive Strength and Heavy Metal Adsorption of Geopolymers

Minerals ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 486
Author(s):  
Alcina Johnson Sudagar ◽  
Slávka Andrejkovičová ◽  
Fernando Rocha ◽  
Carla Patinha ◽  
Maria R. Soares ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Compressive Strength ◽  
Natural Zeolite ◽  
Metal Adsorption ◽  
Low Grade ◽  
Heavy Metal Adsorption ◽  
Adsorption Model ◽  
X Ray ◽  
Adsorption Capacities

Metakaolins (MKs) prepared from low-grade kaolins located in the Alvarães (A) and Barqueiros (B) regions of Portugal were used as the aluminosilicate source to compare their effect on the compressive strength and heavy metal adsorption of geopolymers. Natural zeolite, an inexpensive, efficient adsorbent, was used as an additive in formulations to enhance geopolymers’ adsorption capacities and reduce MK utilization’s environmental footprint. Geopolymers were synthesized with the replacement of MK by zeolite up to 75 wt.% (A25, B25—25% MK 75% zeolite; A50, B50—50% MK 50% zeolite; A75, B75—75% MK 25% zeolite; A100, B100—100% MK). The molar ratios of SiO2/Al2O3 and Na2O/Al2O3 were kept at 1 to reduce the sodium silicate and sodium hydroxide environmental impact. Geopolymers’ crystallography was identified using X-ray diffraction analysis. The surface morphology was observed by scanning electron microscopy to understand the effect of zeolite incorporation. Chemical analysis using X-ray fluorescence spectroscopy and energy dispersive X-ray spectroscopy yielded information about the geopolymers’ Si/Al ratio. Compressive strength values of geopolymers obtained after 1, 14, and 28 days of curing indicate high strengths of geopolymers with 100% MK (A100—15.4 MPa; B100—32.46 MPa). Therefore, zeolite did not aid in the improvement of the compressive strength of both MK-based geopolymers. The heavy metal (Cd2+, Cr3+, Cu2+, Pb2+, and Zn2+) adsorption tests exhibit relatively higher adsorption capacities of Barqueiros MK-based geopolymers for all the heavy metals except Cd2+. Moreover, zeolite positively influenced divalent cations’ adsorption on the geopolymers produced from Barqueiros MK as B75 exhibits the highest adsorption capacities, but such an influence is not observed for Alvarães MK-based geopolymers. The general trend of adsorption of the heavy metals of both MK-based geopolymers is Pb2+ > Cd2+ > Cu2+ > Zn2+ > Cr3+ when fitted by the Langmuir isotherm adsorption model. The MK and zeolite characteristics influence geopolymers’ structure, strength, and adsorption capacities.

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