Optimizing the compressive strength of concrete containing micro-silica, nano-silica, and polypropylene fibers using extreme vertices mixture design

2019 ◽  
Vol 13 (4) ◽  
pp. 821-830 ◽  
Author(s):  
Fatemeh Zahiri ◽  
Hamid Eskandari-Naddaf
Keyword(s):  
Compressive Strength ◽  
Mixture Design ◽  
Polypropylene Fibers ◽  
Nano Silica ◽  
Compressive Strength Of Concrete ◽  
Micro Silica

Properties of Green Concrete Mixes Containing Metakaolin, Micro Silica, Steel Slag, and Recycled Mosaic Tiles

2020 ◽  
Vol 27 (3) ◽  
pp. 45-60
Author(s):  
Muataz Nayel ◽  
Ammar Khazaal ◽  
Waleed Alabdraba
Keyword(s):  
Compressive Strength ◽  
High Performance ◽  
Coarse Aggregate ◽  
Steel Slag ◽  
Cementitious Materials ◽  
Modulus Of Rupture ◽  
Fine Aggregate ◽  
Compressive Strength Of Concrete ◽  
Micro Silica ◽  
Recycled Steel

Recently, the constructions industry begins to make concrete more sustainable, side by side, with making its high performance. This paper aims to investigate the effect of (Metakaolin and Micro Silica) when they replace cement by (8, 12 and 16) % and (6, 9 and 12) % respectively, recycled steel slag when replaces fine aggregate by (10, 20 and 30) %, and recycled mosaic tiles when replaces coarse aggregate by (33.33, 66.67 and 100) % each one another on the slump, density, absorption and compressive strength of concrete. The experimental results showed that the maximum reduction ratio of cement reach (17%) (8% of metakaolin and 9% Micro Silica) while the optimum percentage of mosaic tiles and steel slag is (100%) and (20%) respectively. The optimum percentages obtained are combining to produce three basic green mixes: 1) 17% (8% of Metakaolin and 9% of Micro Silica) only, (2) A mix containing 17% of (Metakaolin and of Micro Silica) plus 100% of recycled mosaic, (3) 17% of (Metakaolin and Micro Silica), 100% of recycled mosaic and 20% of slag. Compressive strength at (7, 28, and 60) days, modulus of rupture at (28) days, absorption, fresh and hardened density are investigated. The best improvement in compressive strength compared with reference concrete was recorded (20.06, 10.855 and 9.983) % at (7, 28 and 60) days respectively for the mix containing (17% of cementitious materials plus 100% of recycled mosaic) while the ultimate flexure strength (24) % appeared in green mix containing (17% of cementitious materials, 100% of recycled mosaic and 20% of slag). Generally, an inverse relationship between density and absorption in all trail mixes which are conducted

Compressive Strength Evaluation of Gingival Composite Restoration Using Micro, Nano, and Hybrid Silica

2020 ◽  
Vol 55 (6) ◽  
Author(s):  
Arief Cahyanto ◽  
Ignes Nathania ◽  
Veni Takarini ◽  
Nina Djustiana ◽  
Zulia Hasratiningsih
Keyword(s):  
Compressive Strength ◽  
Testing Machine ◽  
Gingival Recession ◽  
Weight Percent ◽  
P Value ◽  
Restorative Material ◽  
Nano Silica ◽  
Strength Evaluation ◽  
Hybrid Silica ◽  
Micro Silica

Gingival composites are one of the gingival recession treatments, which can provide an aesthetic and non-invasive alternative. The compressive strength of gingival composite needs to be known as a benchmark of the restorative material. This study aims to develop and investigate the properties of gingival composite restorative materials using micro, nano, or hybrid silica. The experimental method was employed with one-way analysis of variance, using three different kinds of composite materials: micro, nano, and hybrid silica. Comparison of a matrix to filler ratio for three groups were 30:70, 50:50, 60:40 weight percent, respectively. The compressive strength evaluation was done using a universal testing machine with a 5.6 N load, continuously applied with a crosshead speed of 1.0 ± 0.25 mm/minute until a break or crack formed in the samples. The average results of the compressive strength test micro silica were 71.89 MPa, nano-silica 104.23 MPa, and hybrid silica 106.85 MPa. The p-value between the three groups was 0.001; between micro silica and hybrid silica was 0.001; between micro silica and nano-silica was 0.002, and between nano-silica and hybrid silica was 0.738. This study concluded a statistically significant compressive strength of gingival composite restorative material using micro, nano, or hybrid silica. The gingival composite with hybrid silica had the highest compressive strength among the three fillers.

Effect of Nano Silica on Compressive Strength of Concrete

2018 ◽  
Author(s):  
Wail Al-Rifaie ◽  
Abdalmjeed Alawaneh ◽  
Mohammed Al-Bajawi ◽  
Waleed Ahmed
Keyword(s):  
Compressive Strength ◽  
Silica Fume ◽  
Concrete Sample ◽  
Mixing Ratio ◽  
Nano Silica ◽  
Concrete Construction ◽  
Compressive Strength Of Concrete

In the present work, the use of nano silica fume in developing a compressive strength of concrete that can lead to improvement in concrete construction is carried out in the present work. One of the parameters considered is a number of curing days for measuring the compressive strength. The measured results demonstrate the increase in compressive. To achieve our goals, concrete cubes were cast and tested for compressive strength, all concrete sample has the same mixing ratio and sub-classified to standard, and Silica fume added by weight of cement (5%, 10%, 15%, 20% and 30%). The results show that the recommended addition was 15% of Silica fumes for optimum compressive strength that reaches 74.8 MPa.

scholarly journals Optimizing Compressive Strength of Micro- and Nano-silica Concrete by Statistical Method

2017 ◽  
Vol 3 (11) ◽  
pp. 1084 ◽  
Author(s):  
Mahsa Zarehparvar-Shoja ◽  
Hamid Eskandari-Naddaf
Keyword(s):  
Compressive Strength ◽  
Nano Particles ◽  
Nano Silica ◽  
Concrete Technology ◽  
Concrete Mix Design ◽  
Optimal Value ◽  
Two Factors ◽  
New Perspective ◽  
Cement Strength ◽  
Micro Silica

In recent years, the use of nano-particles to improve the properties of concrete has created a new perspective on concrete technology. Studies in this field indicate improved concrete properties and higher strength by adding nano and micro silica particles to concrete mixes. In this regard, 12 mixing designs with different amounts of these admixtures with three types of cement strength classes (525,425,325) and 36 cubic samples (10 × 10 × 10) were designed and tested to measure compressive strength, of which we have only used 6 mixing plans in this research. The purpose of this research is to present a new method for concrete mix design by optimizing principles. Therefore, in this paper, the Taguchi statistical methods and the factorial design of the optimal mixing plan for this type of concrete are used to reduce the number of experiments to predict the optimal composition of the materials. The results obtained from the MINITAB software show that the effect of combined micro-silica and nano-silica on the compressive strength is in one direction and the effect of these two factors is more than cement strength grade of the cement and also the optimal value for micro-silica and nano-silica are estimated to have an optimum amount of micro-silica and nano-silica of 95 and 38 grams, respectively.

scholarly journals The physical and mechanical properties of magnesium oxychloride cement-based materials

2015 ◽  
Vol 14 (4) ◽  
pp. 089-098 ◽  
Author(s):  
Szymon Malinowski ◽  
Justyna Jaroszyńska-Wolińska
Keyword(s):  
Mechanical Properties ◽  
Weight Loss ◽  
Compressive Strength ◽  
Physical And Mechanical Properties ◽  
Polypropylene Fibers ◽  
Experimental Part ◽  
Cement Based Materials ◽  
Magnesium Oxychloride ◽  
Magnesium Oxychloride Cement ◽  
Micro Silica

The aim of this paper was the examination of the physical-mechanical properties of Sorel cement-based material. In the experimental part the effect of polypropylene fibers (PP) and micro-silica on properties of composite materials were studied. The results show that addition of these modifiers increases compressive strength, waterproofing and resistance against corrosion. Increase of compressive strength was observed from both addition of PP and micro-silica. PP resulted in an increase in compressive strength of 0,72 MPa, whereas addition of micro-silica caused an increase of 17,5 % compared to pure Sorel’s cement. Improvement of water-tightness was observed in both additions of PP and micro-silica. Weight loss of samples with PP addition to the concrete after a 7-day bath in an aggressive solution of 5% HCl was less than about 20%.

scholarly journals Performance evaluation of nano-silica concrete

2020 ◽  
Vol 184 ◽  
pp. 01076
Author(s):  
Kakara S J Kumar ◽  
M V Seshagiri Rao ◽  
V Srinivasa Reddy ◽  
S Shrihari
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Performance Evaluation ◽  
Nano Silica ◽  
Interface Zone ◽  
Nano Sio2 ◽  
Concrete Quality ◽  
Micro Silica ◽  
Non Destructive ◽  
Non Destructive Techniques

In this paper, the study of the influence of nano-silica (nano-SiO2) on the properties of the interface between CSH gel and cement particles and its effect on nano-mechanical properties of the products at the interface zone was examined. In this paper M50 grade SCC mixes were developed using 5% micro-silica and various percentages of 0.5%, 1.0% and 1.5% nano-SiO2. For 1.0% nano-SiO2 addition to M50 grade SCC mix, the compressive strength is maximum. Similarly concrete quality using non-destructive techniques, water absorbtion capacity and porosity are also assessed.

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