Use of powdered stone as fine aggregate in making high strength concrete | |
| Author | Aye Monn Monn Sheinn |
| Call Number | AIT Thesis no.ST-98-11 |
| Subject(s) | Aggregates (Building materials) Concrete--Testing |
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering |
| Publisher | Asian Institute of Technology |
| Abstract | An experimental program was conducted to investigate the use of powdered stone as fine aggregate in making high strength concrete having compressive strength in the range of 40 MPa to 70 MPa. The main parameters were types and fineness moduli of fine aggregate. Two types of powdered stones, namely powdered limestone and sandstone, were used as fine aggregates. Natural sand was also used for comparison. The experimental tests were carried out to determine the physical and mechanical properties of high strength concrete using fine aggregate from Thailand of fineness moduli varying from 2.5 to 3.0. The tests were also extended to determine the compressive strengths of mortar using fine aggregate having the same fineness moduli of powdered stones collected from Myanmar and Thailand. Each type of fine aggregate was investigated for its physical properties, namely specific gravity, absorption, unit weight, compacted void content and fineness modulus. Tested results showed that both powdered limestone and sandstone can be used as fine aggregates in making high strength concrete and mortar. For high strength concrete, the average compressive strength of powdered limestone concrete was found to be approximately 76 MPa, which was more or less the same as that of natural sand concrete. The powdered sandstone concrete was found to have average compressive strength of 63 MPa, which was 20 % lower than that of powdered limestone concrete. However it can still be regarded as high strength. For high strength mortar, powdered limestone from Thailand and Myanmar can also be used as fine aggregates. The mortar made of powdered limestone from Myanmar showed the average compressive strength of approximately 83 MPa, which was slightly lower than that made of powdered limestone from Thailand. Also the compressive strength, flexural strength and modulus of elasticity of concrete and compressive strength of mortar were found to increase with increasing fineness moduli from 2.5 to 3.0 regardless of the types of fine aggregate. The specific gravity and absorption of powdered limestone were more or less the same as those of natural sand but powdered sandstone showed lower specific gravity and higher absorption. The workability or slump of fresh concrete was affected by the type and fineness modulus of fine aggregate. Powdered limestone concrete showed slightly lower slump than that of natural sand concrete whereas high absorption capacity of powdered sandstone resulted the lower slump in fixed water cement ratio. It was also found that increasing the fineness modulus of fine aggregate led to more workable concrete. Based on all tested results, it can be concluded that powdered limestone of fineness modulus 3.0 gave the best results in all cases and it can safely be used as fine aggregate in making high strength concrete and mortar. |
| Year | 1998 |
| Type | Thesis |
| School | School of Civil Engineering |
| Department | Department of Civil and Infrastucture Engineering (DCIE) |
| Academic Program/FoS | Structural Engineering (STE) /Former Name = Structural Engineering and Construction (ST) |
| Chairperson(s) | Pichai Nimityongskul; |
| Examination Committee(s) | Wijeyewickrema, Anil C.;Chotchai Charoenngam; |
| Scholarship Donor(s) | Government of Japan;Prospect Burma ; |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 1998 |