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005			20260818090601.0
008			040898 th eng
035			_a.b10197242
099		9	_aAIT Thesis no. ST-84-21
100	1		_aRian, Lian San
245	1	0	_aDevelopment and use of superplasticizers in concrete
260			_aBangkok : _bAsian Institute of Technology, _c1984
300			_a65 p.
490	1		_aThesis ; _vno. ST-84-21
500			_aA thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering, School of Engineering and Technology
502			_aThesis (M.Eng.) - Asian Institute of Technology, 1984
520			_aTwo commercially available superplasticizers and two types of additives derived from sugar cane bagasse and rice straw which are collected from different local paper factories in Thailand were used in different concrete mixes to examine the feasibility f o r use as water-reduced and f lowing concretes. Tests were made with different mix proportions and the effects of types a nd dosages of admixtures on the mechanical properties of concrete namely compressive strength, modulus or rupture a nd modulus o f elasticity were investigated. The test results indicated that the commercially available superplasticizers remarkably improved the mechanical properties of water-reduced concrete and greatly increased the workability of flowing concrete without adversely affecting the strengths. For water-reduce d concrete, the additive derived from sugar can e bagasse is considered to be suitable for use but its efficiency is low compared to the commercial superplasticizers. The other additive derive d from rice straw is found to be of inferior quality than the one derives from sugar cane bagasse. An adverse effect on later strengths t or rich mixes was observe educing this type of additive. For flowing concrete, the additive derived from sugar cane bagasse is economically feasible to be used with a dosage limit of 2%.
650		0	_aConcrete _xAdditives
700	0		_aPichai Nimityongskul, _eChairperson
700	1		_aKarasudhi, Pisidhi, _eExamination Committee
700	0		_aPing Kunawatsatit, _eExamination Committee
710	2		_aGovernment of Republic o f China, _eScholarship Donor
810	2		_aAsian Institute of Technology. _tThesis ; _vno. ST-84-21
856			_3Full-Text _uhttp://203.159.5.9/ait-thesis/detail.php?q=B20550
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