• م.م عبد الله رائد محي
  • Abdullah Al-Ani
  • تدريسي : قسم الهندسة المدنية
  • Teaching : Department of civil engineering
  • ماجستير طرق ومواصلات
  • Raod and Transportation
  • abdullah-raed@esraa.edu.iq
  • a24alani@gmail.com
  • البحوث

    البحوث

    2025 Engineering, Technology & Applied Science Research
    The primary aim of this laboratory study was to develop a Sustainable Roller-Compacted Concrete (S-RCC) that meets strength requirements by incorporating waste building materials. Specifically, waste Clay-Brick (CB) was used as a partial volume replacement for Fine Aggregate (FA) at two levels (15% and 30%) and for filler at 50%. The waste CB was manually broken with a hammer, further crushed using a mechanical crusher, and sieved to produce recycled sand. In addition to conventional water curing, three curing methods were evaluated: water spray, a liquid membrane-forming compound (Sika Antisol-WB), and damp burlap curing. The objective was to determine the most effective curing technique applicable in both laboratory and field settings. The results revealed that the S-RCC mixture containing 15% CB as FA replacement and 50% as filler replacement improved compressive, flexural, and tensile strength by 10.26%, 8.85%, and 7.75%, respectively, after 28 days of normal curing compared to the Reference Mixture (RM). Similarly, the mix with 30% CB as an FA replacement and 50% as a filler showed improvements of 6.29%, 5.42%, and 4.75% in compressive, flexural, and tensile strength, respectively. These enhancements are attributed to effective internal curing, as the highly absorbent nature of waste CB enables gradual water release, promoting hydration and improving the mechanical performance of this zero-slump concrete.

    Keywords: RCC, waste-clay-brick, external curing methods, internal curing

    2025 Journal of Engineering
    The main  objective  of  this  laboratory  study  was  to  produce  environmentally  friendly, sustainable roller-compacted concrete (SRCC) that meets the required strength by utilizing waste building materials such as waste thermostone block as a partial volume replacement of fine aggregate by two percentages (15% and 30%) and filler by 50%. Along with standard curing,   three   different   curing   regimes   were   tested:   spray-water,   liquid-membrane compound (Sika Antisol-WB), and damp-burlap. Regarding the curing methods, the liquid-membrane compound achieved the best results compared to standard-curing, followed by damp-burlap. On the other hand, spray-water resulted in the poorest performance, yielding lower  results  than  standard-curing.  The  results  showed  that  the  SRCC  mixture  containing waste  thermostone  block  (by  15%  substitute  of  fine  aggregate  and  by  50%  substitute  of filler)  improved  the  compressive,  flexural,  and  tensile  strengths  by  1.66%,  1.51%,  and 1.68%,  respectively,  after  28  days  of  standard-curing  compared  to  the  reference-mixture.While  the  SRCC  mixture  containing  waste  thermostone  block  (by  30%  substitute  of  fine aggregate and by 50% substitute of filler) deteriorated the compressive, flexural, and tensile strengths by 4.97, 4.24, and 3.98%, respectively, after 28 days of standard-curing compared to the reference-mixture.
    Keywords: Sustainable  roller-compacted  concrete,  Waste  thermostone  block,  External curing techniques, Internal curing.

    2025 Journal of Ecological Engineering

    Roller-compacted concrete pavement (RC-C-P) is an economical and fast structure that has a relatively dry consistency (zero-slump), but requires more curing care and consideration than conventional concrete pavements. The objective of the research was to investigate the influence of various curing kinds and impact on the mechanical characteristics off RC-C-P. Three various curing techniques can be investigated, compared to lab-normal curing. The liquid membrane-forming compound (Sika Antisol WB) is by spraying to the surface of samples after 2-hour casting and then spraying the sides of the sample following mold extraction. Water is sprayed twice a day (8:30 a.m. and 2:30 p.m.) for three-days and also the damp burlap curing continues three-days. The best curing technique can be recommended is liquid membrane-forming compound technique, since the improvement of compressive strength results up to (12.80, 11.26 and 11.96)% at 7, 28 and 90 days, respectively, compared to lab-normal curing results. While the compressive strength results reduced by (2.37, 3.64 and 4.29)% at 7, 28 and 90 days, respectively, using the damp burlap curing technique compared to lab-normal curing results, it should be taken into consideration that it is still within ACI recommendation (not less than 28 MPa). Finally, the spray-water curing technique needs to be carefully employed in mix design, due to the reduction up to (9, 8.94 and 7.67)% at 7, 28 and 90 days, respectively, for compressive strength test, compared to lab-normal curing results. The results of tensile and flexural strength for RC-C-P with different curing using similar trends with compressive strength results for all curing techniques.

    Keywords: roller compacted-pavement-concrete, curing technique, liquid membrane-forming compound, damp burlap curing.