Evaluation of the cementing efficiency factor of low calcium fly ash for strength development and chloride penetration resistance of concretes
➤ Gửi thông báo lỗi ⚠️ Báo cáo tài liệu vi phạmNội dung chi tiết: Evaluation of the cementing efficiency factor of low calcium fly ash for strength development and chloride penetration resistance of concretes
Evaluation of the cementing efficiency factor of low calcium fly ash for strength development and chloride penetration resistance of concretes
EVALUATION OF THE CEMENTING EFFICIENCY FACTOR OF LOW-CALCIUM FLY ASH FOR STRENGTH DEVELOPMENT AND CHLORIDE-PENETRATION RESISTANCE OF CONCRETES7 7 A y Evaluation of the cementing efficiency factor of low calcium fly ash for strength development and chloride penetration resistance of concretes y ỳsOíơ ỵ I'44256Huynh Tan PhatEVALUATION OE THE CEMENTING EFFICIENCY EACTOR OE LOW-CALCIUM ELY ASH FOR STRENGTH DEVELOPMENT AND CHLORIDE-PENETRATION RESISTANCE OF CONCRETES(71 y V - bT6 y ỹ Ả y yHuynh Tan PhatA THESIS SUBMITTED1 OR THE DEGREE O1 DOC TOR Oi ENGINEERINGDEPARTMENT O1 CIVIL AND ENVIRO Evaluation of the cementing efficiency factor of low calcium fly ash for strength development and chloride penetration resistance of concretes NMENTAL ENGINEERINGHIROSHIMA UNIVERSITY44256ABSTRACTiTy ash which is a principal by-product of coal-iired power plants is used enormously due to its eEvaluation of the cementing efficiency factor of low calcium fly ash for strength development and chloride penetration resistance of concretes
conomic, environmental, and technical advantages. Resides the mitigation of the CO: emission, the use of fly ash to replace a part of cement in concreEVALUATION OF THE CEMENTING EFFICIENCY FACTOR OF LOW-CALCIUM FLY ASH FOR STRENGTH DEVELOPMENT AND CHLORIDE-PENETRATION RESISTANCE OF CONCRETES7 7 A y Evaluation of the cementing efficiency factor of low calcium fly ash for strength development and chloride penetration resistance of concretes ability properties of concretes, and so on. Fly ash is known as a pozzolanic material, which possesses a little or no cementitious value. When fly ash is used to replace pan of the cement in the concrete, its cementing efficiency factor (A'-value) that indicates its contribution to the mechanical an Evaluation of the cementing efficiency factor of low calcium fly ash for strength development and chloride penetration resistance of concretes d durability properties of concretes has been investigated by several studies. The quantity of the fly ash in concrete can be multiplied by the A-valuEvaluation of the cementing efficiency factor of low calcium fly ash for strength development and chloride penetration resistance of concretes
e to estimate the equivalent cement content, which can be added to the existing cement content for the determination of the water-to-cement ratio in tEVALUATION OF THE CEMENTING EFFICIENCY FACTOR OF LOW-CALCIUM FLY ASH FOR STRENGTH DEVELOPMENT AND CHLORIDE-PENETRATION RESISTANCE OF CONCRETES7 7 A y Evaluation of the cementing efficiency factor of low calcium fly ash for strength development and chloride penetration resistance of concretes Most of the proposed methods for determining the A-value of fly ash are for the compressive strength of concretes due to the simplicity and reliability of compression tests. Only a few studies have evaluated the A-valuc of fly ash for the durability of concretes, especially for the chloride-penetra Evaluation of the cementing efficiency factor of low calcium fly ash for strength development and chloride penetration resistance of concretes tion resistances. Additionally, the effects of cement type and walcr-lo-bindcr (W 13) ratio on the A-valuc of fly ash for strength development of concEvaluation of the cementing efficiency factor of low calcium fly ash for strength development and chloride penetration resistance of concretes
retes have not been evaluated in a chemical approach yet. There is a lack of research evaluating the effect of fly ash reaction degree on its A'-valueEVALUATION OF THE CEMENTING EFFICIENCY FACTOR OF LOW-CALCIUM FLY ASH FOR STRENGTH DEVELOPMENT AND CHLORIDE-PENETRATION RESISTANCE OF CONCRETES7 7 A y Evaluation of the cementing efficiency factor of low calcium fly ash for strength development and chloride penetration resistance of concretes discussed in previous studies. Therefore, the three objectives of this research are the following: (I) evaluation of the effect of cement type and w R ratio on the k-value of fly ash for the concrete-strength development for a long period, (2) investigation in a simple approach the A'-vahie of fly a Evaluation of the cementing efficiency factor of low calcium fly ash for strength development and chloride penetration resistance of concretes sh for the chloride-penetration resistance of concretes using the chloride-penetration depth as a concrete-durability property (3) experimental evaluaEvaluation of the cementing efficiency factor of low calcium fly ash for strength development and chloride penetration resistance of concretes
tion of the effect of fly ash reactions on its k-value for the concrete-strength development and chloride-penetration resistance of concretes. In addiEVALUATION OF THE CEMENTING EFFICIENCY FACTOR OF LOW-CALCIUM FLY ASH FOR STRENGTH DEVELOPMENT AND CHLORIDE-PENETRATION RESISTANCE OF CONCRETES7 7 A y Evaluation of the cementing efficiency factor of low calcium fly ash for strength development and chloride penetration resistance of concretes aluations would be shown by using the results of chemical analysis and/or pore structure analysis. To deal with these problems, this thesis is organized as follow:Chapter 1provides the background and motivation of this study.Chapter 2presents a brief review on fly ash and its A'-value for the concre Evaluation of the cementing efficiency factor of low calcium fly ash for strength development and chloride penetration resistance of concretes te-strength development and chloride-penetration resistance of concretes.Chapter 3describes the experimental program consisting of materials and mixtuEvaluation of the cementing efficiency factor of low calcium fly ash for strength development and chloride penetration resistance of concretes
re proportions, the mixing, casting, and curing condition for the paste and concrete specimens. The test procedures were conducted to evaluate the Á'-EVALUATION OF THE CEMENTING EFFICIENCY FACTOR OF LOW-CALCIUM FLY ASH FOR STRENGTH DEVELOPMENT AND CHLORIDE-PENETRATION RESISTANCE OF CONCRETES7 7 A y Evaluation of the cementing efficiency factor of low calcium fly ash for strength development and chloride penetration resistance of concretes of 0.30,0.40,0.50, and 0.60 by mass were prepared to experimentally evaluate the k-value of fly ash. Cement was partially replaced with fly ash at ratios of 20% to 40% bymass for the paste and concrete specimens with a w. B ratio of 0.50. To evaluate the Ấr-value of fly ash for the strength developm Evaluation of the cementing efficiency factor of low calcium fly ash for strength development and chloride penetration resistance of concretes ent of concretes, two types of cement, namely, ordinary Portland cement (OPC) and high-early-strength Portland cement (HSPC) were used for making pastEvaluation of the cementing efficiency factor of low calcium fly ash for strength development and chloride penetration resistance of concretes
e and concrete specimens. In addition, a w, B ratio of 0.30 was further used for making OPC specimens to investigate effect of w B ratio on the k-valuEVALUATION OF THE CEMENTING EFFICIENCY FACTOR OF LOW-CALCIUM FLY ASH FOR STRENGTH DEVELOPMENT AND CHLORIDE-PENETRATION RESISTANCE OF CONCRETES7 7 A y Evaluation of the cementing efficiency factor of low calcium fly ash for strength development and chloride penetration resistance of concretes y the OPC and two fly ash replacement ratios of 20% (F20) and 40% (F40) by mass for the paste and concrete specimens with a W.B ratio of 0.50 were investigated. A sodium chloride solution (10% NaCl) was used for the immersion test.iiChapter 4investigates the effects of cement type and w B ratio on t Evaluation of the cementing efficiency factor of low calcium fly ash for strength development and chloride penetration resistance of concretes he fc-value of low-calc ium fly ash for the concrete-strength development by (1) examining the degree of fly ash reaction in pastes and analyzing hydrEvaluation of the cementing efficiency factor of low calcium fly ash for strength development and chloride penetration resistance of concretes
ation product using the X-ray diffraction analysis. (2) evaluating the Portlandite (CH) content in pastes as well as calculating the CH consumption byEVALUATION OF THE CEMENTING EFFICIENCY FACTOR OF LOW-CALCIUM FLY ASH FOR STRENGTH DEVELOPMENT AND CHLORIDE-PENETRATION RESISTANCE OF CONCRETES7 7 A y Evaluation of the cementing efficiency factor of low calcium fly ash for strength development and chloride penetration resistance of concretes ongly affects the Á-valuc of fly ash for concrete-strength development because of the significant difference in the Blaine fineness between cement and fly ash as well as the difference in the relationships between cemcnl-to-water ratio and compressive strength of the control concretes. With the pres Evaluation of the cementing efficiency factor of low calcium fly ash for strength development and chloride penetration resistance of concretes ence of calcite (approximate 4% by mass) in the OPC. the stabilization of monocarbonate indirectly resulting in the stabilization of ettringite led toEvaluation of the cementing efficiency factor of low calcium fly ash for strength development and chloride penetration resistance of concretes
a more significant increase in the compressive strength of OPC concrete containing fly ash despite a low degree of fly ash reaction in OPC paste compEVALUATION OF THE CEMENTING EFFICIENCY FACTOR OF LOW-CALCIUM FLY ASH FOR STRENGTH DEVELOPMENT AND CHLORIDE-PENETRATION RESISTANCE OF CONCRETES7 7 A y Evaluation of the cementing efficiency factor of low calcium fly ash for strength development and chloride penetration resistance of concretes t of fly ash, and all A'-values increased significantly after 28 days due to the pozzolanic reaction of fly ash. Further, a modified equation of the CH consumption taking the cement-hydration-enhancement effect into account was firstly proposed to evaluate precisely the CH consumption in fly-ash cem Evaluation of the cementing efficiency factor of low calcium fly ash for strength development and chloride penetration resistance of concretes ent paste. This result is consistent well with the result of the degree of fly ash reaction, especially for OPC paste with a low w B ratio of 0.30.ChaEvaluation of the cementing efficiency factor of low calcium fly ash for strength development and chloride penetration resistance of concretes
pter 5aims al simply evaluating the Á-valuc of low-calcium fly ash for the chloride-penetration resistance of concretes using the chloride-penetrationEVALUATION OF THE CEMENTING EFFICIENCY FACTOR OF LOW-CALCIUM FLY ASH FOR STRENGTH DEVELOPMENT AND CHLORIDE-PENETRATION RESISTANCE OF CONCRETES7 7 A y Evaluation of the cementing efficiency factor of low calcium fly ash for strength development and chloride penetration resistance of concretes cretes is evaluated by using the apparent diffusion coefficient (Dạpp) of chloride ion as well as the XJ. Additionally, the results of pore size distribution in pastes are presented in this chapter. Results indicate that Xd could be used as a concreteiiidurability property to obtain the /.--value of Evaluation of the cementing efficiency factor of low calcium fly ash for strength development and chloride penetration resistance of concretes fly ash in a simple approach compared to the Dapp. The I’-values of fly ash based on the Xd of the concrete after the immersion periods of 13. 26. anEvaluation of the cementing efficiency factor of low calcium fly ash for strength development and chloride penetration resistance of concretes
d 39 weeks ranged from 2.75 to 3.94 and from 1.96 to 2.69 for F20 and F40 samples, respectively. The replacement of 40% or less cement by fly ash in tEVALUATION OF THE CEMENTING EFFICIENCY FACTOR OF LOW-CALCIUM FLY ASH FOR STRENGTH DEVELOPMENT AND CHLORIDE-PENETRATION RESISTANCE OF CONCRETES7 7 A y Evaluation of the cementing efficiency factor of low calcium fly ash for strength development and chloride penetration resistance of concretes 0 after 39 weeks of exposure to a 10% NaCl solution with regard to the chloride-diffusion coefficient. In addition, the results of pore size distribution in pastes indicated that the refinement effect of the fly ash reaction related to the significant reduction of the volume of pore in the diameter Evaluation of the cementing efficiency factor of low calcium fly ash for strength development and chloride penetration resistance of concretes range of 0.02 to 0.33 pm could improve the chloride-penetration resistance of concretes.Chapter 6discusses (1) the relationship between the Ả'-value oEvaluation of the cementing efficiency factor of low calcium fly ash for strength development and chloride penetration resistance of concretes
f fly ash for concretestrength development and the degree of fly ash reaction. (2) the effect of the degree of fly ash reaction on the A’-value for thEVALUATION OF THE CEMENTING EFFICIENCY FACTOR OF LOW-CALCIUM FLY ASH FOR STRENGTH DEVELOPMENT AND CHLORIDE-PENETRATION RESISTANCE OF CONCRETES7 7 A y Evaluation of the cementing efficiency factor of low calcium fly ash for strength development and chloride penetration resistance of concretes etration resistance. Briefly, the /--value of fly ash for the strength development of concretes increased linearly with an increase in the degree of fly ash reaction regardless of cement type and w. B ratio. Also, the /--value of fly ash based on the Xd of concretes increased linearly with the incre Evaluation of the cementing efficiency factor of low calcium fly ash for strength development and chloride penetration resistance of concretes ment in the degree of fly ash reaction subsequent to the start of immersion. For OPC concretes with a w B ratio of 0.50. the /--value of fly ash for tEvaluation of the cementing efficiency factor of low calcium fly ash for strength development and chloride penetration resistance of concretes
he chloride-penetration resistance of the concrete was approximately 2.5 higher than that for the concrete-strength development at each correspondingGọi ngay
Chat zalo
Facebook