خواص الخلطة شبه المرنة باستخدام الحقين الاسمنتي المحسن بالمواد المستدامه

Characterizing A Semi-Flexible Mixture Incorporating Sustainable Modified Grout

Abstract

Road important represents the arteries in the human body; the roads are the arteries of communication life which is necessary for our life.
Rigid and flexible Pavements these days are successfully used to mitigate the high stresses and high traffic loads effect on subgrade soil. However, these two types of road pavements have disadvantages while constructed and after their use. The main question is: are such pavements economically effective? Additionally, constructing a flexible pavement is associated with pollution for its high preparation temperature and high CO2 emissions. At the same time, rigid pavement pollution is associated with CO2 emissions during cement production. Moreover, the failure phenomena of both pavement techniques are hard to deal with.
For that a semi-flexible pavement (SFP) which gathering these two road types properties, has been proposed. It can decrease pollution especially when sustainable waste materials (SWMs)are incorporating in SFP production. Grout formation using SWMs can also add economic benefits. SFP, generally, consists of a flexible side represented in porous asphalt mixture with 25-35% air void and the rigid side represent a cementous grout that injects into the open-graded asphalt mixture.
In this study a sustainable grout is developed, it is consisted of ordinary Portland cement (OPC), silica fume (SF), superplasticizer (SP), water, and palm frond waste ash (waste material from palm trees, PFWA) PFWA is suggested as supplementary cement materials SCM. The developed grout was characterized using different testing methods such as a fresh fluidity test, mechanical compressive, and flexural strength.
The open-graded asphalt mixture with 30 % air void and 4 % asphalt content (modified asphalt with 3 % low-density polyethylene LDPE) was nominated as the control mix, while the developed grouts were injected to prepare SFP mixtures. The SFP mixture was characterized in terms of volumetric, mechanical, and durability properties.
Results showed that SFP has superior properties compared with the open-graded mixture. The safety side represented in skid resistance showed high enhancement with SFP about 12.2%, also deformation resistance side (cracking and rutting) deformation represented in indirect tensile strength enhancement about 75%, creep compliance test enhancement about 90%, and wheel track test showed high enhancement with SFP compared with the conventional open-graded mixture that failure in 5000 repetition before SFP.
The enhancement that has been shown in the results is due to the denser microstructure of SFP compared with the open-graded mixture. This pavement technology confirms that it is very cost-effective, eco-friendly, and resistant to deformation.