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035			_a.b11829473
099		9	_aAIT Thesis no. ST-01-06
100	0		_aThanongsak Aneksrup
245	1	0	_aDevelopment of an optimal process for concrete containing admixtures cured with microwave energy to predict 28-day compressive strength
260			_aBangkok : _bAsian Institute of Technology, _c2001
300			_a62 leaves
490	1		_aThesis ; _vno. ST-01-06
500			_aA thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering, School of Civil Engineering
502			_aThesis (M.Eng.) - Asian Institute of Technology, 2001
520			_aThe prediction method of 28-day compressive strength of normal-cured concrete without admixtures, and with superplasticizers, accelerator, and retarder, based on the accelerated strength by microwave curing technique is investigated. The optimal process involving the optimal power, the penetration resistance level and the rest time are determined and then applied to concrete whose mix proportions obtained from ACI standard mix design. The optimal power at a combination power of P40 (259 watts) for 30 minutes and P30 (197 watts) for 15 minutes is determined to achieve both high early strength and slightly deteriorated later-age strength. The penetration resistance level at 3.45 MPa (500 psi) of sieved mortar is determined and used as the indicator for the starting time of microwave energy application. The rest time at 3 .5 hours is determined to allow continuation of hydration process after microwave curing until the early age test time. The compressive strength of microwave-cured concrete and normal-cured concrete are tested at the early age test time and 28 days, respectively. Eventually, only one equation to predict 28-day compressive strength of concrete containing admixtures can be established from correlation between early strength of microwave-cured concrete and water/cement ratio, and correlation between 28-day strength of normal-cured concrete and water/cement ratio. The prediction is reasonably accurate yielding the average and maximum percentages of error within 6 and ±11 , respectively.
650	1	0	_aConcrete _xCuring
650	1	0	_aStrength of materials
700	0		_aPichai Nimityongskul, _eChairperson
700	0		_aThanakorn Pheeraphan, _eCo-Chairperson
700	1		_aNii, Kazuyoshi, _eExamination Committee
700	1		_aTakewaka, Koji, _eExamination Committee
710	2		_aRoyal Thai Government/Human Resource Development Program (Phase II), _eScholarship Donor
810	2		_aAsian Institute of Technology. _tThesis ; _vno. ST-01-06
856			_3Full-Text _uhttp://203.159.5.9/ait-thesis/detail.php?q=B09458
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