موقعك الحالي:صفحة رئيسية>المنتجات
2014-2-28 The kaolin geopolymers gave high compressive strength (29.6 MPa) after 91 days of age, but they required slightly high temperature setting at 80 °C for 24 h to be solidified. The geopolymers produced from kaolin mixed with either bagasse ash or rice husk ash was stronger than those from single ashes and they could be hardened at room temperature.
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The chemical and mineral composition of the kaolin were determined by XRF and XRD techniques. For the synthesis, sodium silicate and sodium hydroxide were used in molar ratios of Na 2 O.SiO 2 /NaOH = 1.0, 1.6 and 2.2 and the curing of the samples was performed at 40 °C. The compressive strength of the samples was evaluated at 7 and 28 days of age.
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analyze the effects on compressive strength, drying shrinkage, and sulphate expansion, and on characteristics observed with SEM and XRD techniques. 2. EXPERIMENTAL PROGRAMS 2.1. Materials The MK was derived from kaolin by calcination at 750 ºC for 2 h. The raw kaolin came from a kaolin mine in Narathiwat province of southern Thailand. The
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compressive strength of geopolymer from NaOH of different concentration (6, 8, 10, 12 and 14M) at age of 1, 2 and 3 days curing in oven at temperature 80°C. 0
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In this study an Artificial Neural Network (ANN) model was used to predict the Unconfined Compressive Strength (UCS) of Kaolin clay mixed with pond ash, rice husk ash and cement content model under different curing period. The input parameters included percentages of admixtures added along with clay content and curing period.
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2021-1-20 Natural non-calcined kaolin 95% amorphous was used for the synthesis of geopolymer. • The effect of the Na 2 O.SiO 2 /NaOH ratio on the mechanical behavior was determined.. The geopolymer paste shows 65 MPa of compressive strength and 0.39 GPa of hardness.
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2019-10-10 The compressive strengths of the geopolymer synthesized with NaOH concentration of 10 M (curing time of 7 days) and a curing time of 28 days were 26.98 MPa and 28.55 MPa, respectively, which were approximately 22.58% and 52.35% higher compared to the geopolymer synthesized with NaOH concentration of 4 M and a curing time of 1 day.
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2020-10-29 The 7 days compressive strength of control and treated pastes were 49.9 and 53.7 MPa, respectively. These strength values are comparable to the other reported compressive strengths of calcined kaolinite geopolymers35,36. The treatment by CaCl 2 had a positive effect on the strength development. The increase of strength was due partly to the additional
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2015-2-1 They developed the expression to describe the relationship between the compressive strength and relative density in brittle open-cell porous ceramics as σ c / σ fs = C(ρ / ρ s) 3/2 = C(R) 3/2 where σ c is compressive strength, σ fs is the fracture strength of the parent material for a brittle solid, C is a geometric constant characteristic of the unit cell shape and has been found to be approximately 0.2,
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2020-2-19 of 38.85±1.66 MPa compressive strength and 11.40±1.24 MPa bending strength. The strengths were inversely proportional to the elemental Si/Al ratio of the raw materials, in which the Chiangmai
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2020-8-18 significantly affected the compressive strength of kaolin a kaolin-based geopolymer mortar. The optimum values of adding NaOH and Ca(OH) 2 are 5wt % and 10wt % respectively. Jingming Cai et al [9], used low-calcium fly ash, meta-kaolin, and fly ash with slag as a
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In this study an Artificial Neural Network (ANN) model was used to predict the Unconfined Compressive Strength (UCS) of Kaolin clay mixed with pond ash, rice husk ash and cement content model under different curing period. The input parameters included percentages of admixtures added along with clay content and curing period. The curing Period range was 7, 14 and 28 days considered in neural ...
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2020-10-29 Nakhon Ratchasima 30000 Thailand Corresponding author, e-mail:songsudavichan@gmail Received 10 Oct 2012 ... reactive in dissolution in the CCR than the crystalline phase of quartz and kaolin in clay. KEYWORDS: stabilization, pozzolanic reaction, C-A-S-H, unconfined compressive strength ... unconfined compressive strength of the CCR and BA
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2017-5-23 Compressive strength and surface structure The 7 days compressive strength of control and treated pastes were 49.9 and 53.7 MPa, respectively. These strength values are comparable to the other reported compressive strengths of calcined kaolinite geopolymers35,36. The treatment by CaCl 2 had a positive effect on the strength development. The
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Modeled Dry Compressive Strength of Sodium Silicate bonded Kaolin Refractory Bricks has been presented in this paper. The following conclusions were drawn from the research work: (a) The polynomial regression analysis is a power tool to estimate theoretically the dry compressive strength of the kaolin refractory.
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2015-2-1 Compressive strength. The mechanical properties of porous ceramics were determined through compressive strength test, Eq. , using a compression machine (Labtech Instrument Co. Ltd., Taiwan). Load was applied on parallel flat surfaces with a loading rate of 5 mm/min until a crack formed, causing failure of the specimen.
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2021-3-10 The compressive strength firstly increased and then decreased with the increase in sintering temperature, reaching a maximal value of 9 MPa at 900 C. Previous research reported the compressive strength of kaolin geopolymer after 24 h curing in 60 C. However, the strength obtained was only 1 MPa [19]. Figure 2.
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2020-3-5 velocity (vs) and unconfined compressive strength (qu). 2. MATERIALS AND METHODS 2.1 Raw Materials Three main raw materials were used in preparing the stabilised soil specimens, namely kaolin as the base clay, ordinary Portland cement (OPC) and PALF as the stabilizing agents. The kaolin was supplied by Kaolin (M) Sdn. Bhd.[8] and the OPC
Read More2018-3-28 compressive strength were examined by X-ray diffraction, scanning electron microscope, and universal testing machine, respectively. The results show that the compressive strength decreased from 36.83, 14.00, and 20.37 MPa related to the concentration of Na2SiO3 from 30,
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2020-9-29 Highest compressive strength values of pressed and cast geopolymers were 27.74 and 22.30 MPa, respectively. Thus, pressed geopolymer contained a lower content of alkali activator and had higher compressive strength in comparison to the cast geopolymers contained a
Read More2017-5-23 Compressive strength and surface structure The 7 days compressive strength of control and treated pastes were 49.9 and 53.7 MPa, respectively. These strength values are comparable to the other reported compressive strengths of calcined kaolinite geopolymers35,36. The treatment by CaCl 2 had a positive effect on the strength development. The
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kaolin of variabl e particle size was added to epoxy. Influences of the addition of these fillers on the mechanical properties (Young's modulus, yield, tensile, and compressive strength) were examined. 2. Experimental Procedure 2.1. Materials System The matrix material used for the present study was epoxy (type:CY233 supplied by Ciba
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2017-5-7 Stabilized kaolin soil showed the highest compressive strength value when it was mixed with 35% of polymer compared to other percentages that marked an increment in strength which are 45.72% (3 days), 67.57% (7 days), 81.73% (14 days) and 77.84% (28 days). Hence, the most effective percentage of liquid polymer which should be used to increase ...
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In this study, an experimental program was conducted to evaluate the relation between splitting and compressive strength of high performance concretes modified with different types of calcined kaolins (CKs) and metakaolin (MK). CKs were obtained by heat treatment of crude Turkish kaolins while MK was obtained from high purity Czech kaolin. Four replacement levels from 0 to 20% of total cement ...
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2021-3-1 The compressive strength firstly increased and then decreased with the increase in sintering temperature, reaching a maximal value of 9 MPa at 900 °C. Previous research reported the compressive strength of kaolin geopolymer after 24 h curing in 60 °C. However, the strength obtained was only 1
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The result shows that the kaolin binder has adequate compressive strength and is able to apply for non-loading construction materials. This paper outlines the potential of kaolin to produce an environmental friendly, energy saving, clean technology to conserve the natural environment and resources.
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2016-6-28 1 Center of Excellence Geopolymer and Green Technology, School of Materials Engineering, Universiti Malaysia Perlis (UniMAP), 01007, P.O Box 77, D/A Pejabat Pos Besar, Kangar, Per
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2020-10-14 Raw kaolin clay was heated at 800°C for 8 hours to produce metakaolin. The pozzolanic activity was determined by both strength-activity index and X-ray diffraction method. A total of 180 specimens was cast and tested for compressive strength and acid resistance.
Read More2017-8-14 This paper presents experimental investigation on the effect of specimen shapes of engineered cementitious composites (ECCs). In various types of cement concrete, cubic specimens have shown to have higher compressive strength than cylindrical specimens. However, no research has been conducted yet to study the effect of specimen shapes (cube or cylinder) on the compressive strength
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2019-8-29 The compressive strength results were found in the region of 43–48 MPa with higher strength found at higher metakaolin content. Therefore, the results of alkali-activated metakaolin cement paste mixes showed interesting change in the major phase of C–S–H to N–A–S–H depending on amount of Portland cement and metakaolin.
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الصين -تشنغ تشو -المنطقة الوطنية للتنمية الصناعية للتكنولوجيا المتطورة، جادة العلوم رقم 169.
الاتصال: 0371-86549132.