Effects of aggregate gradations on properties of Grouted Macadam composite pavement

Abstract

Grouted Macadam composite pavement (GMCP) is generally a composite pavement which is manufactured by preparing a highly workable fluid mortar which is specially designed with a very high early and 28 day strength (1 day -45 MPa, 28 day -105 MPa) by filling the flowing fluid mortar into a very open porous asphalt skeleton (25-32% Voids in Mix -VIM). The combination of both components will produce a semi-rigid pavement or GMCP which has the best features of both rigid concrete and flexible bituminous pavement where it will replace the conventional wearing course. This paper will investigate the significance difference of GMCP produced by the 3 different aggregate gradations by Road Engineering Association of Malaysia (REAM) in volumetric properties, durability and strength. The best quality fluid grout was chosen to fill the porous asphalt skeleton and GMCP was subjected for compression test, VIM and indirect tensile test (IDT) to check on its performance. The results show that the 3 different aggregate gradations significantly affect the volumetric properties, durability and strength. Furthermore it will also help in reducing pollution and helps with the current environmental problems.

Effects of Aggregate Gradation on the Physical Properties of Semiflexible Pavement

“…It is obvious that the increment of fine aggregates in the aggregate gradations has caused accretion towards the bitumen binder. Fine aggregates contribute to a wider surface area thus preparing a higher amount of bitumen binder to coat all the aggregates in the mix [17,18]. This eventually will necessitate a higher usage of binder from G1 up to G3.…”

“…G2 and G3 have also achieved the targeted value and at the same time have given a better strength compared to the conventional flexible pavement strength, that is, 3 MPa. The final results of the SFP will obviously help in producing and improving the quality of pavement currently being used in Malaysia [17].…”

Cementitious Grouts for Semi-Flexible Pavement Surfaces—A Review

“…The higher the resilient modulus, the greater the material resistance against permanent deformation. Similarly, the three aggregate gradations have a different compressive strength of semi-flexible specimens using the same type of grout [ 58 ]. Furthermore, aggregate gradation (G3) with less porosity causes a delay in grout infiltration, and hence, a smaller amount of grout was utilized, due to which G3-based, semi-flexible specimens present the lowest compressive strength and least resistance to abrasion compared to G1 and G2 aggregate gradation [ 59 ].…”

Influential Factors and Evaluation Methods of the Performance of Grouted Semi-Flexible Pavement (GSP)—A Review

“…Moreover, the water permeability of samples which have a large proportion in larger particles (14~10 mm) is significantly higher than that of average samples (Table 2) [46]. A lower residual void rate of GSP will be obtained after grouting [50,51]. Overall, a coarser aggregate gradation can be more conducive to forming a larger void space, which has better interconnection, to make the grouted cement mortar more easily able to penetrate the OMA mat [46,52].…”