Local Silica Sand as a Substitute for Standard Ottawa Sand in Testing of Cement Mortar

2020 ◽  
Vol 1000 ◽  
pp. 220-226
Author(s):  
Wieke Pratiwi ◽  
Gaos Abdul Karim ◽  
Titi Rachmawati
Keyword(s):  
Quality Control ◽  
Compressive Strength ◽  
Cement Mortar ◽  
Silica Content ◽  
Sem Analysis ◽  
Silica Sand ◽  
Ottawa Sand ◽  
South Sulawesi ◽  
Good Potential

Compressive strength of cement mortar is an important parameter in the quality control of Portland cement. The limitation of Ottawa sand imports has prompted a study on the potential and utilization of local silica sand available in several regions in Indonesia. The purpose of this study was to investigate the potential and possibility of utilizing local silica sand from several regions in Indonesia including Bangka, Belitung, Sidrap (South Sulawesi Province) as a substitute for standard Ottawa sand in cement mortar testing. Evaluation of local silica sands consisted of SEM analysis, characterization of silica sands and testing of cement mortar compressive strength. Silica sands from Bangka, Belitung and Tuban had silica content of more than 90%, while that from Sidrap was more or less 90%. Based on the SEM analysis, characteristic of silica sands, and compressive strength of cement mortar, local silica sand from Sidrap (South Sulawesi Province) has a good potential to be used as a substitute for standard Ottawa sand in testing of cement mortar.

Experimental Study on CaCO3 Whisker-Reinforced Fiber Cement Mortar

2011 ◽  
Vol 477 ◽  
pp. 245-251 ◽  
Author(s):  
Ming Li Cao ◽  
Hang Yao ◽  
Li Jiu Wang
Keyword(s):  
Compressive Strength ◽  
Fiber Length ◽  
Cement Mortar ◽  
High Strength ◽  
Sem Analysis ◽  
High Thermal Stability ◽  
Polypropylene Fibers ◽  
Composite Effect ◽  
Reinforced Fiber ◽  
Reinforcing Material

As a kind of monocrystal reinforcing material, CaCO3 whisker has good characteristics of high strength, high module and high thermal stability. This research aims to optimize the microscopic structure of fiber cement mortar by adding CaCO3 whiskers and improve the macroscopic mechanical properties. The results showed that CaCO3 whiskers increased the flexural and compressive strength of cement mortar at 3d age by 29.5% and 19.8% at maximum respectively, which fell to 7.2% and 13.0% at 28d age; when CaCO3 whiskers content was 10% and polypropylene fibers content was 0.05%, compared with the pure cement mortar, the flexural and compressive strength were increased by 32.4% and 29.4% at 3d age and 7.6% and 4.6% at 28d age respectively; when the fiber length was 9mm, the composite effect of whiskers and fibers was more ideal; through the SEM analysis, the reinforcing mechanisms of CaCO3 whiskers and polypropylene fibers in cement mortar were discussed.

scholarly journals Influence of Plantain Pseudostem Fibres and Lime on the Properties of Cement Mortar

2020 ◽  
Vol 2020 ◽  
pp. 1-9
Author(s):  
Humphrey Danso
Keyword(s):  
Tensile Strength ◽  
Compressive Strength ◽  
Linear Correlation ◽  
Calcium Silicate Hydrate ◽  
Cement Mortar ◽  
Sem Analysis ◽  
Mortar Specimen ◽  
Eds Analysis ◽  
Positive Linear Correlation ◽  
Strength Improvement

This study investigated the properties of cement mortar with lime reinforced with plantain pseudostem fibres. Experimental specimens with 0, 0.25, 0.5, 0.75, and 1% fibre contents by weight of sand and 10% lime content by weight of cement were prepared and tested on 7, 14, 21, and 28 days of curing for density, tensile strength, compressive strength, SEM, and EDS. The 0.25% plantain pseudostem fibre reinforced mortar achieved 23.4% compressive strength improvement over unreinforced mortar specimens. There was between 6.89 and 13.80% increase in tensile strength of the plantain pseudostem fibre reinforced mortar over the unreinforced mortar specimens. A positive linear correlation was found between the compressive strength and tensile strength of cement mortar reinforced with plantain pseudostem fibres and lime with coefficient of determinant (R2) values between 0.909 and 0.869. It was also observed that the plantain pseudostem fibre reinforced mortar specimen had some microcracks and voids from the SEM analysis. Furthermore, EDS analysis showed the presence of calcium silicate hydrate with a Ca/Si ratio of between 1.02 and 2.49, and Al/Si ratio of between 0.76 and 0.81 as the main oxide. It therefore concluded that the incorporation of plantain pseudostem fibre and lime positively influenced the properties of the cement mortar with the 0.25% fibre content being recommended for construction application.

Application of XRD in a rapid quality control system of cement

1999 ◽  
Vol 14 (2) ◽  
pp. 114-117 ◽  
Author(s):  
G. Goswami ◽  
J. D. Panda
Keyword(s):  
Quality Control ◽  
Compressive Strength ◽  
Control System ◽  
Cement Mortar ◽  
Accurate Method ◽  
Regression Equation ◽  
Quality Control System ◽  
Conventional Test ◽  
Cement Clinkers

The present paper establishes that the ratio between the XRD pulse counts of cement clinkers at d=0.278 and 0.274 nm bears a distinct relationship with the degree of sintering of the clinker, which is one of the factors that determine the cement quality. The paper also presents a rapid and accurate method for predicting both 3- and 28-day compressive strength (CCS) of cement mortar cubes based on XRD of the cement clinkers. The method is based on an index Xn derived from the XRD pulse counts at d=0.2959 and 0.287 nm corresponding to alite (hkl=202) and belite (hkl=102) phases of the clinker, respectively. The regression equation derived for a particular plant is (1) 3 day CCS=Xn×240 kg/cm2, when Xn<1 and 240+26 (Xn−1) kg/cm2, when Xn>1, where Xnmaximum=5.5. (2) 28 day CCS=C+C×In/100, where C=3 days CCS estimated by XRD (1), In=90−10Xn, where Xnmax=5.5. Calculated CCS values, in average, vary from the conventional test values by +5.9% to −5.4% and +3.8% to −3.5% in cases of 3- and 28-day CCS, respectively.

Characterization of Power Plant Bottom Ash and its Application to Cement Mortar

2009 ◽  
Vol 620-622 ◽  
pp. 221-224
Author(s):  
Woo Teck Kwon ◽  
Byung Ik Kim ◽  
Y. Kim ◽  
Soo Ryong Kim ◽  
Sang Wook Ha
Keyword(s):  
Thermal Conductivity ◽  
Compressive Strength ◽  
Fly Ash ◽  
Power Plant ◽  
Building Material ◽  
Cement Mortar ◽  
Bottom Ash ◽  
Chemical Properties ◽  
Chemical Compositions

In this work, the physical & chemical properties of bottom ash generated from power plant are analyzed. Characteristic mortar property and thermal conductivity for building material were investigated with content of added bottom ash. According to the analytic result of bottom ash, chemical compositions of bottom ash is similar to those of fly ash and compressive strength after 7days related to pozzolanic activity shows 2.5N/cm2 and it is confirmed that bottom ash possess a certain amount of moisture activity. Although the fluidity of cement mortar is rapidly decreased with increasing addition of bottom ash, compressive strength for 3 and 7days is increased. The thermal conductivity is not sensitive to the addition of bottom ash.

scholarly journals Thermal Characterization of Pozzolanic Activity of Hydrated Cement System Modified by Silica Based Industrial Waste

2016 ◽  
Vol 2 (1) ◽  
Author(s):  
Faatima Zahra Ahmat Asim ◽  
Norsuzailina Mohamed Sutan
Keyword(s):  
Compressive Strength ◽  
Cement Paste ◽  
Industrial Waste ◽  
Cement Mortar ◽  
Thermal Characterization ◽  
Pozzolanic Activity ◽  
Gravimetric Analysis ◽  
Cement Replacement ◽  
Partial Cement Replacement

This study investigates the potential of using silica based industrial waste specifically waste calcined clay (WCC) from ceramic industry as partial cement replacement. Pozzolanic activity characterization was done by using thermal and mechanical characterization techniques namely Thermal Gravimetric Analysis (TGA) and Compressive Strength Test (CS), respectively. Finely grounded waste vase of varying particles sizes range from less than 75m, 75m and 150m were used as 10%, 20%, and 30% cement replacements with 0.45 water to cement ratio (w/c). First, progression of CS from day 1 to 28 of WCC modified mortar and unmodified cement mortar (UCM) was monitored as an indirect indication of pozzolanic activity. It was found that 75WCC10% performed higher 28 day compressive strength compared to unmodified cement mortar (UCM). To further confirm the result, TGA characterization of Calcium Silicate Hydrate (C-S-H) and Calcium Hydroxide (CH) as pozzolanic activity indicator was done on WCC modified cement pastes in comparison to unmodified cement paste (UCP). TGA analysis has shown the pozzolanic activity indicated by the decrease of CH and the increase of C-S-H in WCC modified cement paste. Based on this study, WCC possesses pozzolanic characteristic which is the main criteria to be qualified as an effective material as partial cement replacement.

Incorporation of Iraqi Rocks in the Production of Eco-Friendly Cement Mortar

2020 ◽  
Vol 38 (10A) ◽  
pp. 1522-1530
Author(s):  
Rawnaq S. Mahdi ◽  
Aseel B. AL-Zubidi ◽  
Hassan N. Hashim
Keyword(s):  
Mechanical Properties ◽  
Thermal Conductivity ◽  
Compressive Strength ◽  
Water Absorption ◽  
Structural Properties ◽  
Mechanical Milling ◽  
Cement Mortar ◽  
Cement Mortars

This work reports on the incorporation of Flint and Kaolin rocks powders in the cement mortar in an attempt to improve its mechanical properties and produce an eco-friendly mortar. Flint and Kaolin powders are prepared by dry mechanical milling. The two powders are added separately to the mortars substituting cement partially. The two powders are found to improve the mechanical properties of the mortars. Hardness and compressive strength are found to increase with the increase of powders constituents in the cement mortars. In addition, the two powders affect water absorption and thermal conductivity of the mortar specimens which are desirable for construction applications. Kaolin is found to have a greater effect on the mechanical properties, water absorption, and thermal conductivity of the mortars than Flint. This behavior is discussed and analyzed based on the compositional and structural properties of the rocks powders.

Emerging Techniques for the Characterization of Nano-Mechanical Properties of Integrated Circuit Components

2008 ◽  
Author(s):  
Nicholas Randall ◽  
Rahul Premachandran Nair
Keyword(s):  
Mechanical Properties ◽  
Quality Control ◽  
Integrated Circuits ◽  
Integrated Circuit ◽  
Manufacturing Process ◽  
Solder Bumps ◽  
Initial Work ◽  
Circuit Components ◽  
Materials Used

Abstract With the growing complexity of integrated circuits (IC) comes the issue of quality control during the manufacturing process. In order to avoid late realization of design flaws which could be very expensive, the characterization of the mechanical properties of the IC components needs to be carried out in a more efficient and standardized manner. The effects of changes in the manufacturing process and materials used on the functioning and reliability of the final device also need to be addressed. Initial work on accurately determining several key mechanical properties of bonding pads, solder bumps and coatings using a combination of different methods and equipment has been summarized.

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