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อัตราส่วนผสมที่มีผลกระทบต่อสมบัติการไหล ความหนืด และแรงเสียดทานภายในของมอร์ตาร์ไหลได้ |
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| รหัสดีโอไอ | |
| Creator | อนุวัฒน์ อรรถไชยวุฒิ |
| Title | อัตราส่วนผสมที่มีผลกระทบต่อสมบัติการไหล ความหนืด และแรงเสียดทานภายในของมอร์ตาร์ไหลได้ |
| Contributor | ธนพล ญาณวีรศักดิ์, บุราฉัตร กิตติกรจรัส, เพ็ญนภา ภาควัตร, ฐิติพงศ์ ปล้องพันธุ์ |
| Publisher | King Mongkut’s University of Technology Thonburi |
| Publication Year | 2564 |
| Journal Title | KMUTT Research and Development Journal |
| Journal Vol. | 44 |
| Journal No. | 3 |
| Page no. | 409-426 |
| Keyword | Flowability, Viscosity, Internal Friction, Self-compacting Mortar, Self-compacting Concrete |
| URL Website | https://journal.kmutt.ac.th/ |
| Website title | เว็บไซต์วารสารวิจัยและพัฒนา มจธ. |
| ISSN | 2697-5521 |
| Abstract | The present research studied flowability, viscosity and internal friction ofmortars prepared using local materials in Thailand in order to evaluate freshproperties of the mortars that can be used for the production of selfcompactingconcrete. The results showed that flowability increased andviscosity decreased by increasing the dosage of a superplasticizer. The utulizeddosage depended on the mix proportions, which consist of sand to mortarratio (s/m) and water to cement ratio (W/C). The suitable dosage was notedto be in the range of 0.6-2.9%. Mortars with high W/C and low s/m requiredlower dosage of superplasticizer comparing to those with lower W/C or highers/m. Over dosage of superplasticizer adversely affected flowability of mortar,especially in the case of mortar with low W/C (W/C 30%). Internal friction ofmortars significantly decreased with increased water content in mixtures,especially in the case of mortars with higher s/m; this is because such mortarscontained higher internal friction, so increasing water could effectively reducethe internal friction. The friction reduced from 0.54 to 0.32 by increasing W/Cfrom 40% to 45%. On the other hand, mortar with low s/m (s/m 45%) exhibitedlower internal friction, so increasing the water content did not significantlyaffect internal friction, which remained at approximately 0.2. Mortar mixturesthat can be applied to produce self-compacting concrete should containsand to mortar ratio in the range of 45-50% and water to cement ratio in therange of 30-45%. |
