จำนวน Repository ( 14 )

คุณสมบัติเชิงกลของคอนกรีตมวลเบาผสมวัสดุปอซโซลาน
คุณสมบัติเชิงกลของคอนกรีตมวลเบาผสมวัสดุปอซโซลาน

This research study the effect of pozzolanic materials on light weight concrete by replacement cement with fly ash and Meta kaolin which affect the properties of concrete by using pumics aggregate. Coarse in aerated concrete and consider mechanical properties. Aerated concrete replacement cement by fly ash 20% 35% and 50% respectively and meta-kaolin is replaced. From the results it was found that the compressive strength of light weight concrete at 28 days w/b = 0.55 was higher than that of every 14 days of cement and cement cement replacement by fly ash 50% highest value compressive strength. More than all the ingredients replaced with fly ash and Meta kaolin. When considering the flexural strength of replacement cement with 10% by Meta kaolin the maximum flexural strength of 80 ksc was higher than that of control concrete and all other ingradient. Experimental tensile strength at 28 days result found that replacement cement by fly ash at 35% gave the highest tensile strength of 28 ksc and gave higher tensile strength than all other ingradient. From the impact strength test at age 28 days it was found that the replacement cement 35% by fly ash gave the highest impact strength of 92.00 joule than the 20% and 50% respectively and higher impact strength than that of all kaolin. Except for control concrete.

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การรับแรงกระแทกของคอนกรีตผสมปอซโซลานโดยระบบสามประสาน
การรับแรงกระแทกของคอนกรีตผสมปอซโซลานโดยระบบสามประสาน

This research study to the effect of pozzolanic materials by replacement cement by fly ash and Meta kaolin which affect the mechanical and physical properties of concrete. According to Standard test such as Compressive strength flexural strength and impact strength. The replacement cement by fly ash was 15% 30% and 45% respectively and replacement cement by meta-kaolin was 10% 15% and 20% respectively. The results showed that the compressive strength of concrete at 28 days. When considered ratio w/b = 0.40 was higher than w/b = 0.45 all ingredient. The replacement cement by fly ash was the most effective. 10% (375 ksc) 15% (362 ksc) and 20% (354 ksc) respectively. The replacement cement by meta-kaolin gave the highest flexural strength of 41 ksc higher than control mixed concrete and all other ingredient. At the age of 28 days The replacement cement by meta-kaolin was 10 percent result to the highest impact strength was 11 joule which was close to that of fly ash by 30 percent give value was 110 joules and more than replacement cement by meta-kaolin was 15% (100 joule) and 20% (95 joule). It can be concluded that the increase in meta-kaolin content result to compressive strength will reduce flexural strength and impact strength. As the amount of fly ash increased the compressive strength increased. flexural strength and impact strength Increased value.

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การรับแรงกระแทกของคอนกรีตผสมดินขาวและเถ้าลอย
การรับแรงกระแทกของคอนกรีตผสมดินขาวและเถ้าลอย

This research to study the possibility of material pozzolan as binder by replacment cement by fly ash (FA) and meta kaolin (MK) some for testing compressive strength flexural strength and impact strength of concrete vary the ratio of water to binder (w / b) of 0.40 and 0.45 and the amount of fly ash to replace cement some 15 % 30 % MK and 35% for 10% 15% and 20% by weight of cement. The sample consisted of a cylinder diameter of 10 x 20 cm beam sizes 10 x 10 x 40 cm and 4 x 4 x 16 cm from the test results showed that the concrete samples at 28 days and w/ b of 0.40 to greater than 0.45 all mixed. the compressive strength by replacing cement with FA increase up to 30 % compression of 382 ksc higher than the 20 percent replace by MK were equal to 354 ksc and 32.48 ksc compared to replace cement with FA 15 % is equal to 31 ksc 30% were equal to 30 ksc and 45% were equal to 23.85 ksc while the MK was replaced by 10% were equal to 40.10 ksc higher than to 15% and 20% respectively. The control sample was replaced with MK by 10% is equal to 111 joules maximum replaced by fly ash more than 30% were equal to 110 joules and MK were 15% fly ash 15 and 45 percent respectively.

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อิทธิพลของของวัสดุปอซโซลานโดยระบบสามประสานต่อกำลังและความต้านทานคลอไรด์ของคอนกรีต
อิทธิพลของของวัสดุปอซโซลานโดยระบบสามประสานต่อกำลังและความต้านทานคลอไรด์ของคอนกรีต

This objective research to study the possibility of used pozzolan material in the ternary blend by fly ash metakaolin and silica powder by replacement cement partially on the strength and resistance to chloride migration. Consideration of concrete with compressive strength in the range of 240-350 kg per sq. cm by varying the ratio of water/binder (w/b) there are three values are 0.4 0.45 and 0.50 and variable amounts of replacement cement some. The ternary blend of the fly ash metakaolin and silica powder of percentage of 0 2.5 5 10 15 20 and 25 by weight of cement. and the control specimens (w/b) without contain fly ash kaolin and silica powder the slump test in the range of 3-5 cm and the use superplasticizer to control the slump test of concrete. By casting specimens of cylindrical diameter 10x20 cm cube 10x10x10 cm and the beam size 10x10x35 cm after curing 28 days and test compressive tensile and flexural strength of concrete all specimens each ingredient by Chloride Migration Test method and the results showed that concrete is a mixture with pozzolan such as silica powder metakaolin and fly ash with amount increase replacement. The increase will help improve the quality of the concrete physical properties. The increased of compressive and Tension strength as the percentage increase especially to replacement cement increased by fly ash metakaolin and silica powder reduces the penetration of chloride in concrete respectively As a result of the porosity of the concrete with lower amounts of tightness concrete has increased

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อิทธิพลของคุณสมบัติเชิงกลของใยสังเคราะห์ต่อคานปอซโซลานคอนกรีต
อิทธิพลของคุณสมบัติเชิงกลของใยสังเคราะห์ต่อคานปอซโซลานคอนกรีต

This research aims to study the possibility of steel fibers plastic fiber (polypropylene) fly ash and metakaolin mixed into the concrete. The concrete used in the research of the w / c 0.42 By 0.5 percent in the volume of steel fiber and poly propylene fiber in the amount of 0.25 percent by weight of the concrete. Concrete example of this test consisted of plain concrete(OPC).Concrete mixing materials pozzolan fly ash mixed plastics synthetic fibers of the type poly propylene fiber(FA/PP)concrete mixing materials pozzolan fly ash mixed plastics synthetic fibers of the type steel fibers (FA/ST) concrete mixing materials pozzolan meta kaolin mixed plastics synthetic fibers of kind polypropylene fiber(MK/PP) and concrete mixing materials pozzolan meta kaolin mixed plastics synthetic fibers of the typesteel fibers (MK/ST) by casting a cylindrical sample size 10 x 20 cm. Sample size 10x10x10 cm. cube and sample size 10x10x35 cm. beam. After 28 days and cure water concrete examples to test the strength of the pull compressive strength and flexural strength. And to test the movement of chloride through the concrete with Chloride Migration Test. Then bring the strength of the pull compressive strength flexural strength and the chloride permeability of concrete. Bringing concrete materials pozzolan mixed with synthetic fibers to develop the quality of concrete with improved efficiency and also reduces the porosity of the concrete. And permeability of chloride formed in the concrete (Only in landscape with the sea). The test can tell. Concrete mixing materials pozzolan with synthetic fibers to make a significant impact on the properties of concrete is improved as well. Depending on the type of polyester and the amount of material to pozzolan blended.

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