Mathematical model of strength and porosity of ternary blend Portland rice husk ash and fly ash cement mortar

Sumrerng Rukzon,Prinya Chindaprasirt 사단법인 한국계산역학회 2008 Computers and Concrete, An International Journal Vol.5 No.1

This paper presents a mathematical model for strength and porosity of mortars made with ternary blends of ordinary Portland cement (OPC), ground rice husk ash (RHA) and classified fly ash (FA). The mortar mixtures were made with Portland cement Type I containing 0-40% FA and RHA. FA and RHA with 1-3% by weight retained on a sieve No. 325 were used. Compressive strength and porosity of the blended cement mortar at the age of 7, 28 and 90 days were determined. The use of ternary blended cements of RHA and FA produced mixes with good strength and low porosity of mortar. A mathematical analysis and two–parameter polynomial model were presented for the strength and porosity estimation with FA and RHA contents as parameters. The computer graphics of strength and porosity of the ternary blend were also constructed to aid the understanding and the proportioning of the blended system.

Strength and chloride penetration of Portland cement mortar containing palm oil fuel ash and ground river sand

Sumrerng Rukzon,Prinya Chindaprasirt 사단법인 한국계산역학회 2009 Computers and Concrete, An International Journal Vol.6 No.5

This paper presents a study of the strength and chloride penetration of blended Portland cement mortar containing ground palm oil fuel ash (POA) and ground river sand (GS). Ordinary Portland cement (OPC) was partially replaced with POA and GS. Compressive strength, rapid chloride penetration test (RCPT) and chloride penetration depth of mortars were determined. The GS only asserted the packing effect and its incorporation reduced the strength and the resistance to chloride penetration of mortar. The POA asserted both packing and pozzolanic effects. The use of the blend of equal portion of POA and GS also produced high strength mortars, save cost and excellent resistance to chloride penetration owing to the synergic effect of the blend of POA and GS. For chloride depth, the mathematical model correlates well with the experimental results. The computer graphics of chloride depth of the ternary blended mortars are also constructed and can be used to aid the understanding and the proportioning of the blended system.

Use of Ternary Blend of Portland Cement and Two Pozzolans to Improve Durability of High-strength Concrete

Sumrerng Rukzon,Prinya Chindaprasirt 대한토목학회 2014 KSCE JOURNAL OF CIVIL ENGINEERING Vol.18 No.6

This paper presents the use of ternary blend of Portland cement with two pozzolans in producing high-strength concrete. PortlandCement Type I (CT) was partially replaced with ground Bagasse Ash (BA), ground rice husk-bark ash (RB) and Fly Ash (FA) at thedosage levels of 20% and 40% by weight of binder. In addition to a single material replacement, a blend of equal weight portions ofRB and FA; and BA and FA were used. Compressive strength, porosity, chloride penetration, corrosion resistance and modulus ofelasticity of concretes were determined. Test results reveal that the resistance to chloride penetration of concrete improvessubstantially with partial replacement of CT with a blend of equal weight portion of FA and RB; or FA and BA and the improvementincreases with an increase in the replacement level. The corrosion resistances of FARB and FABA concretes were better than the CTconcrete or concrete with one pozzolan. The ternary blend is attractive as FA reduces the amount of the SP needed to maintain theworkability and the enhanced resistance to chloride penetration is also obtained from the synergic effect between the two pozzolans.

The effects of replacement fly ash with diatomite in geopolymer mortar

Theerawat Sinsiri,Tanakorn Phoo-ngernkham,Vanchai Sata,Prinya Chindaprasirt 사단법인 한국계산역학회 2012 Computers and Concrete, An International Journal Vol.9 No.6

This article presents the effect of replacement fly ash (FA) with diatomite (DE) on the properties of geopolymer mortars. DE was used to partially replace FA at the levels of 0, 60, 80 and 100% by weight of binder. Sodium silicate (Na2SiO3) and sodium hydroxide (NaOH) solutions were used as the liquid portion in the mixture in order to activate the geopolymerization. The NaOH concentrations of 15M, Na2SiO3/NaOH ratios of 1.5 by weight, and the alkaline liquid/binder (LB) ratios by weight of 0.40, 0.50, 0.60 and 0.70 were used. The curing at temperature of 75oC for 24 h was used to accelerate the geopolymerization. The flows of all fresh geopolymer mortars were tested. The compressive strengths and the stress-strain characteristics of the mortar at the age of 7 days, and the unit weights were also tested. The results revealed that the use of DE to replace part of FA as source material in making geopolymer mortars resulted in the increased in the workability, and strain capacity of mortar specimens and in the reductions in the unit weights and compressive strengths. The strain capacity of the mortar increased from 0.0028 to 0.0150 with the increase in the DE replacement levels from 0 to 100%. The mixes with 15M NaOH, Na2SiO3/NaOH of 1.5, LB ratio of 0.50, and using 75oC curing temperature showed 7 days compressive strengths 22.0-81.0 MPa which are in the range of normal to high strength mortars.

Effect of Sodium Hydroxide and Sodium Silicate Solutions on Strengths of Alkali Activated High Calcium Fly Ash Containing Portland Cement

Tanakorn Phoo-ngernkham,Sakonwan Hanjitsuwan,Nattapong Damrongwiriyanupap,Prinya Chindaprasirt 대한토목학회 2017 KSCE Journal of Civil Engineering Vol.21 No.6

In this paper, the mechanical performance of fly ash and Portland cement geopolymer activated with sodium hydroxide and sodium silicate solutions was studied. The Geopolymer Mortars (GM) were made from high calcium Fly Ash (FA) and ordinary Portland Cement (PC) with FA:PC weight ratios of 100:0, 95:5, 90:10, 85:15, and 80:20. The GMs were activated with three combinations of sodium Hydroxide Solution (SH) and sodium Silicate Solution (SS) viz., SH, SH+SS (SH:SS=2) and SS. For all mixes, 10 molar SH, alkali activator liquid/solid binder ratio of 0.60 and curing at ambient temperature of 25oC were used. The result indicated that the compressive and shear bond strengths of GM depended on the alkali activators used and the amount of PC. The use of SH and SHSS resulted in the formation of additional Calcium Silicate Hydrate (CSH) which coexisted with sodium aluminosilicate hydrate (NASH) gel. Whereas, the use of SS resulted in NASH gel with only a small amount of CSH. The increasing of PC content enhanced the compressive and shear bond strengths of GMs due to the formation of additional CSH. The 15% PC mixed with SHSS gave the optimum compressive and shear bond strengths.

Investigation of Properties of Lightweight Concrete with Calcined Diatomite Aggregate

Patcharapol Posi,Surasit Lertnimoolchai,Vanchai Sata,Tanakorn Phoo-ngernkham,Prinya Chindaprasirt 대한토목학회 2014 KSCE JOURNAL OF CIVIL ENGINEERING Vol.18 No.5

This paper reports the investigation of the properties of Lightweight Concrete (LWC) made from Portland cement and diatomiteaggregate. The chemical and physical properties of diatomite and the mechanical properties of LWC with regard to the effects ofcalcined temperature and gradation were studied. The uncalcined diatomite was crushed and calcined at 400, 600, and 800°C for 4hours and used as lightweight aggregate. A constant Water to Cement ratio (W/C) of 2.0 and Aggregate to Cement ratio (A/C) of 1.6were used for all mixes. The 28-day compressive strength of LWC of 6.4-11.9 MPa, porosity and water absorption of 34.0-49.4%,modulus of elasticity of 2.0-4.3 GPa, thermal conductivity of 0.166-0.192 W/mK, and unit weight of 1170-1300 kg/m3 wereobtained. The results indicated that the strength of concrete increased when the calcined temperature of diatomite and the amount ofsmall-size aggregate were increased. The increase in temperature ridded the burnable elements and improved the properties ofdiatomite. The small-size aggregate produced good matrix-aggregate bonding and enhanced the strength of concrete. The calcineddiatomite could, therefore, be used as good aggregate in making lightweight concrete.

Mechanical Properties, Thermal Conductivity, and Sound Absorption of Pervious Concrete Containing Recycled Concrete and Bottom Ash Aggregates

Chanchai Ngohpok,Vanchai Sata,Thaned Satiennam,Pongrid Klungboonkrong,Prinya Chindaprasirt 대한토목학회 2018 KSCE JOURNAL OF CIVIL ENGINEERING Vol.22 No.4

This paper presents the effect of replacement level of natural aggregate (crushed limestone aggregate, LS) with Recycled Concrete(RC) and coal Bottom Ash aggregates (BA) on pervious concrete properties. Mechanical properties, thermal conductivity, and soundabsorption of pervious concrete were tested. Results showed that the compressive strength of BA pervious concrete was excellentand comparable to that of LS pervious concrete. While the compressive strength of RC pervious concrete was slightly reduced tobetween 85 and 99% of that of LS pervious concrete. The thermal conductivity and sound absorption of pervious concretescontaining RC and BA were significantly improved compared to those of pervious concretes containing conventional LS.

Structural Lightweight Concrete Containing Recycled Lightweight Concrete Aggregate

Athika Wongkvanklom,Patcharapol Posi,Banlang Khotsopha,Chetsada Ketmala,Natdanai Pluemsud,Surasit Lertnimoolchai,Prinya Chindaprasirt 대한토목학회 2018 KSCE JOURNAL OF CIVIL ENGINEERING Vol.22 No.8

In this paper, Structural Lightweight Concrete (SLC) containing Recycled Lightweight Aggregate (RLA) is described. Damagedlightweight concrete was used as RLA by crushing it into fine particles, and used to replace fine limestone aggregate of up to 45% byweight. To enhance the strength development of SLC, silica fume and a superplasticizer were incorporated into the mixture. Thecompressive strength, density, water absorption, porosity, modulus of elasticity, and thermal conductivity of the concrete were tested. The results show that SLC with satisfactory 28-day compressive strengths of between 16.5 and 30.5 MPa, and densities of between1600 and 1800 kg/m3, were obtained. The compressive strength, modulus of elasticity, and thermal conductivity decreased with anincrease in RLA content, and the water absorption and porosity increased. Water absorption of 3.28–7.87%, porosity of 6.82–13.87%, modulus of elasticity of 16.5–25.2 GPa, and thermal conductivity of 0.49–0.75 W/mK were found to be within the workingrange of SLC.

Probabilistic Seismic Hazard Assessment of North-Eastern Thailand

Piyawat Foytong,Teraphan Ornthammarath,Rungroj Arjwech,Apichat Janpila,Natthapong Areemit,Anat Ruangrassamee,Prinya Chindaprasirt 대한토목학회 2020 KSCE JOURNAL OF CIVIL ENGINEERING Vol.24 No.6

The Northeast of Thailand is defined as a low seismic hazard region. However, earthquakes were reported and felt by local people around 25 years ago. Using probabilistic seismic hazard analysis (PSHA), this research evaluates the seismic hazard in the Northeast region of Thailand to be the database for seismic design. The seismic hazard is expressed in the term of peak ground acceleration (PGA) at base rock level. The crustal faults and earthquake events are considered as the seismic source in this evaluation. Two crustal faults are evaluated in Thakhaek fault and Phetchabun fault, which have not been considered before in PSHA. Earthquake events are classified into two types: background seismicity zones and subduction zones. The results reveal that the highest peak ground acceleration at base rock level is in Bueng Kan province and Nakhon Phanom province. The evaluated seismic hazard in the Northeast region is approximately 30% g and 12% g with a return period of 2,475 years and 475 years, respectively. Results obtained from this study are about two times higher than the Earthquake Resistant Design code 1302 of Thailand. The evaluated seismic hazard is higher than the peak ground accelerations that can cause damage to building structures (>3.9% g).

Fire-resistant and thermal insulation improvements of cement mortar with auto glass waste sand

Yuwadee Zaetang,Jakkapong Lao-un,Athika Wongkvanklom,Ampol Wongsa,Vanchai Sata,Prinya Chindaprasirt 대한토목학회 2023 KSCE Journal of Civil Engineering Vol.27 No.9

This research investigates the physical, mechanical, thermal conductivity, and fire-resistant properties of mortar incorporating with auto glass waste (AGW). The crushed AGW was used as fine aggregate to substitute natural sand (NS) from 0 to 100% by volume. The 40% replacement with AGW was optimum, with a slight increase in the 28-day compressive strength. The 90-day compressive strength of 100% AGW increased by 33% compared to NS mortar (without AGW) due to the increased pozzolanic reaction. The replacement of sand with AGW resulted in improvements in thermal insulation properties and fire resistance of mortars. The 100% replacement with AGW decreased the thermal conductivity coefficient by 63%, while the density decreased by only 2.8% compared to the NS mortar. The residual compressive strength increased with incorporating AGW after exposure to elevated temperatures. The 100% replacements with AGW showed a maximum compressive residual mortar strength of 66 MPa (126%) after exposure to high temperatures at 300°C.