An Experimental Study on Reasonable Content of Slag in Concrete C30

2013 ◽  
Vol 312 ◽  
pp. 377-381
Author(s):  
Qing Fang Zhang
Keyword(s):  
Experimental Study ◽  
Compressive Strength ◽  
Portland Cement ◽  
Large Volume ◽  
Ordinary Portland Cement ◽  
Civil Engineering ◽  
Double Doping ◽  
Mix Proportion ◽  
Different Ages ◽  
Compressive Strength Of Concrete

This study used ordinary portland cement of 42.5 strength grade, mixed with various minerals and water reducer for the preparation of concrete C30 by means of four schemes, for each of which a specific mix proportion was employed. Accordingly the compressive strength of concrete with different preparations at different ages were compared. No matter which scheme was employed, single or double doping, with or without superplasticizer, the compressive strength of concrete at different ages was maximized when slag amount was 30% or maximum. Hence it can be concluded that the reasonable content of slag should be 30% for the preparation of concrete C30. It is suggested that the above results can be better applied to large-volume concrete, underground, harbor, road and bridge and civil engineering as well.

Experimental Study on Compatibility between Alkali-Free Liquid Concrete Accelerators and Cement

2013 ◽  
Vol 438-439 ◽  
pp. 102-107 ◽  
Author(s):  
Wen Kang Guo ◽  
Li Wang ◽  
Shu Yin Wang ◽  
Dao Yin Lan ◽  
Sheng Ping Li
Keyword(s):  
Mechanical Properties ◽  
Experimental Study ◽  
Compressive Strength ◽  
Portland Cement ◽  
Ordinary Portland Cement ◽  
Strength Ratio ◽  
Setting Times ◽  
Gypsum Content ◽  
Durability Of Concrete

This paper selected two kinds of alkali-free liquid concrete accelerators and tested their compatibility with ordinary Portland cement, Portland cement and moderate heat Portland cement by measuring the setting times, compressive strength and compressive strength ratio of samples. The results showed that the compatibility is good between alkali-free accelerators and two types of cement: ordinary Portland cement and moderate heat Portland cement. However, the compatibility of two accelerators and Portland cement are quite different, the compatibility of AFA-2 accelerator is excellent, but AFA-1 accelerator is very poor. The setting times of alkali-free accelerators is mainly influenced by the mixing materials content, gypsum content, C3A and C3S content. In order to ensure the mechanical properties and durability of concrete, the setting times of new concrete accelerator is not the shorter the better, the appropriate initial and final setting times are 1min30s~5min and 4min~ 12min respectively.

Experimental study on concrete with rice husk ash under sulphuric ACID solutions

2018 ◽  
Vol 7 (4.5) ◽  
pp. 522
Author(s):  
R. Ramya Swetha ◽  
Dr. G.Venkata Ramana ◽  
K. Anusha Hadassa
Keyword(s):  
Experimental Study ◽  
Compressive Strength ◽  
Portland Cement ◽  
Sulphuric Acid ◽  
Rice Husk ◽  
Industrial Waste ◽  
Ordinary Portland Cement ◽  
Rice Husk Ash ◽  
Acid Solutions ◽  
Iron And Calcium

This investigation shows the results on aggressive sulphuric acid on the concrete combined with rice husk ash (RH) when partially replaced for ordinary Portland cement. The husk ash, which mainly contains aluminum ion, silica, iron and calcium oxides, is an industrial waste and poses disposal problems. In this study, the effect of various concentrations (1%, 3%, 5%) of sulphuric acid (H2SO4) on Concrete replaced with various percentages (0%,5%,10%,15% and 20% by weight of cement) of RH is evaluated in-terms of residual compressive strength. The loss of compressive strengths of concrete immersed in various H2SO4 solutions for 7 days 28 days and 60 days indicates that at upto 10% replacement increase in strength was observed after which strengths were decreasing. This increase in strength is attributed to pozzolanic activity of RH.  

scholarly journals Influence of Selected Curing Techniques on Compressive Strength of Concrete From Palm Kernel Shell Ash and Ordinary Portland Cement

2021 ◽  
Vol 4 (3) ◽  
Author(s):  
Oluwatosin Babatola
Keyword(s):  
Compressive Strength ◽  
Portland Cement ◽  
Ordinary Portland Cement ◽  
Palm Kernel ◽  
Maximum Size ◽  
Portland Cement Concrete ◽  
River Sand ◽  
Palm Kernel Shell ◽  
Crushed Aggregate ◽  
Compressive Strength Of Concrete

This paper discusses the findings of an experimental study on the effect of various curing procedures on the compressive strength of concrete produced by partially substituting portland cement with Palm Kernel Shell Ash (PKSA). Palm kernel shell ash was utilized in a 1:2:4 mix ratio as a partial substitute for ordinary Portland cement (OPC) at percentage levels of 0%, 10%, and 15%. River sand with particles passing a 4.75 mm BS sieve was used, as well as crushed aggregate with a maximum size of 20 mm, and palm kernel shell ash with particles passing a 212 μm sieve. The compressive strength of the test cubes (150 mm x 150 mm x 150 mm) was determined after 7, 28, and 56 days of curing. The results demonstrated that test cubes containing Palm kernel shell ash developed strength over a longer curing period than ordinary Portland cement concrete samples and that the strength changes depending on the amount of PKSA in the cube samples. The findings showed that at 28 days, test cubes with 5%, 10%, and 15% PKSA content in all curing procedures utilized obtained a greater compressive strength. Curing by immersion produced the highest compressive strength in all replacement level while the concrete cured by sprinkling and spraying gives a lower strength in all replacement leve

The Effect of Nanoparticles of Ordinary Portland Cement (OPC) on Compressive Strength of Concrete

2014 ◽  
Vol 894 ◽  
pp. 342-348
Author(s):  
Abdoullah Namdar ◽  
Fadzil Mat Yahaya
Keyword(s):  
Compressive Strength ◽  
Portland Cement ◽  
Ordinary Portland Cement ◽  
Construction Material ◽  
Simple Method ◽  
X Ray ◽  
Compressive Strength Of Concrete ◽  
Stability Of Structure ◽  
Scanning Electron

The quality of a construction material satisfies stability of structure. Several additives have been innovated for improve quality of compressive strength of concrete. In this paper for enhancement of compressive strength of concrete, a simple method has been proposed. The kaolin and bentonite have been treated by heat for duration of 1 hour, with constant temperature. For kaolin 200 oC, 400 oC, 600 oC, 800 oC, 1000 oC and 1200 oC of heat, and for bentonite 200 oC, 400 oC, 600 oC, 800 oC of heat has been subjected. The kaolin and bentonite treated by heat have been proposed as additive for concrete. The objective is to introduce an additive to improve compressive strength of concrete. The microstructure of modified Ordinary Portland Cement (OPC) paste has been investigated by using Field Emission Scanning Electron Microscopy (FESEM) and X-ray diffractometry (XRD). The results indicate that the best level of heat for produce additives from kaolin and bentonite, and illustrate quantity of additives for replace a portion of cement in concrete application. Modification of nanoparticles of cement paste during hydration has been discussed.

scholarly journals إيجاد مقاومة الضغط المستقبلية الناتجة تحت تأثير محتوى الكلوريدآت والكبريتات بالخرسانة

2021 ◽  
Vol 9 (2) ◽  
pp. 95-99
Author(s):  
ابوالقاسم يحي ابوصبيع ◽  
الطيب حسن اونسة
Keyword(s):  
Compressive Strength ◽  
Portland Cement ◽  
Great Degree ◽  
Ordinary Portland Cement ◽  
Strength Testing ◽  
Sulfate Content ◽  
Engineering Program ◽  
High Durability ◽  
Concrete Quality ◽  
Compressive Strength Of Concrete

The compressive strength of concrete is the primary characteristic of concrete quality, as the high durability of concrete is one of the characteristics that gave concrete its position, and low durability is the most important problem facing concrete. This study aims to lay the foundations for forming a preliminary idea on knowing the compressive strength of future concrete other than destroying concrete and following up on it without doing destructive tests for it. In order to obtain results that simulate reality to a great degree. In this research, a laboratory study was conducted where a concrete mixture was made and after conducting experiments on the materials included in the mixture and preparing concrete cubes of ordinary Portland cement and sulfate-resistant cement and compressive strength testing on them in times of 28 days and 60 days and 90 days and 180 days and 365 days and subjected to conditions Treating (water and air) and performing chemical analyzes on it to determine the percentage of chlorides and sulfates in the concrete. From the results of the research, an engineering program was designed using Mat lab program to obtain future strength. And reached by the program to know the compressive strength of future concrete under the influence of the chlorides and sulfate content of concrete and the results were good.  

Study on Waterproof and Water-Resistant Properties of Gypsum

2012 ◽  
Vol 476-478 ◽  
pp. 1585-1588
Author(s):  
Hong Pan ◽  
Guo Zhong Li
Keyword(s):  
Compressive Strength ◽  
Flexural Strength ◽  
Portland Cement ◽  
Water Absorption ◽  
Ordinary Portland Cement ◽  
Experimental Results ◽  
Softening Coefficient

The comprehensively modified effect of cement, VAE emulsion and self-made acrylic varnish on mechanical and water-resistant properties of gypsum sample was investigated and microstructure of gypsum sample was analyzed. Experimental results exhibit that absolutely dry flexural strength, absolutely dry compressive strength, water absorption and softening coefficient of gypsum specimen with admixture of 10% ordinary Portland cement and 6% VAE emulsion and acrylic varnish coated on its surface can respectively reach to 5.11MPa , 10.49 MPa, 8.32% and 0.63, respectively.

Experimental Study on Sand and Cement Replacement by Termite Mound Soil

2019 ◽  
pp. 279-287
Author(s):  
Harish R ◽  
Ramesh S ◽  
Tharani A ◽  
Mageshkumar P
Keyword(s):  
Experimental Study ◽  
Experimental Investigation ◽  
Compressive Strength ◽  
Natural Environment ◽  
Fine Aggregate ◽  
Test Results ◽  
Termite Mound ◽  
Cement Concrete ◽  
Cement Ratio ◽  
Compressive Strength Of Concrete

This paper presents the results of an experimental investigation of the compressive strength of concrete cubes containing termite mound soil. The specimens were cast using M20 grade of concrete. Two mix ratios for replacement of sand and cement are of 1:1.7:2.7 and 1:1.5:2.5 (cement: sand: aggregate) with water- cement ratio of 0.45 and varying combination of termite mound soil in equal amount ranging from 30% and 40% replacing fine aggregate (sand) and cement from 10%,15%,20% were used. A total of 27 cubes, 18 cylinders and 6 beams were cast by replacing fine aggregate, specimens were cured in water for 7,14 and 28 days. The test results showed that the compressive strength of the concrete cubes increases with age and decreases with increasing percentage replacement of cement and increases with increasing the replacement of sand with termite mound soil cured in water. The study concluded that termite mound cement concrete is adequate to use for construction purposes in natural environment.

scholarly journals The Effect of Nano Metakaolin Material on Some Properties of Concrete

2013 ◽  
Vol 6 (1) ◽  
pp. 50-61
Author(s):  
Amer M. Ibrahem ◽  
Shakir A. Al-Mishhadani ◽  
Zeinab H.Naji
Keyword(s):  
Tensile Strength ◽  
Compressive Strength ◽  
Portland Cement ◽  
Water Absorption ◽  
Thermal Activation ◽  
Ordinary Portland Cement ◽  
Splitting Tensile Strength ◽  
Kaolin Clay ◽  
Cement Ratio ◽  
Water Cement Ratio

This investigation aimed to study the effect of nano metakaolin ( NMK ) on some properties (compressive strength ,splitting tensile strength & water absorption ) of concrete. The nano metakaolin (NMK) was prepared by thermal activation of kaolin clay for 2 hours at 750 Ċ. The cement used in this investigation consists of ordinary Portland cement (OPC). The OPC was partially substituted by NMK of ( 3, 5 & 10%) by weight of cement. The C45 concrete was prepared , using water/cement ratio ( W/c) of (0.53) .The Water absorption was tested at 28 days while the tests (compressive strength ,splitting tensile strength) were tested at ages of (7, 28, 60,& 90) days . The compressive strength and splitting tensile strength of concrete with NMK were higher than that of reference concrete with the same W/c ratio.The improvement in the compressive strength when using NMK was (42.2, 55.8 , 63.1% ) at age 28 days for ( 3%, 5%, &10% ) replacement of NMK respectively whereas the improvement in the splitting tensile strength was (0% , 36% & 46.8 %) at age of 28 days when using (3%, 5%, &10% ) NMK respectively. The improvement in the water absorption was (16.6%, 21.79%, &25.6 ) when using (3, 5, &10% )NMK.

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