High performance cement treated crushed stone (BGTCAD): essay on (and between) the “old” and the “new” with reformulated triadic dialogue
DOI:
https://doi.org/10.58922/transportes.v31i3.2911Keywords:
HPCTCS, Mixture proportion, Triadic dialogueAbstract
Cement treated crushed stone (CTCS) was introduced in the mid-1960s in the country. The mixing technology and its parameters changed little since then, except for academic research works that have influenced numerous semi-rigid pavement projects developed from the 90’s. In the last three decades, the technologies of cements and concretes have evolved drastically to meet new construction challenges and specially to overcome technical limitations regarding dosage, cracking, mixing processes and construction methods for concrete, as well as the durability and sustainability of structures. CTCS, however, did not absorb new concepts for applications in paving with cementitious materials, aiming to remedy the disheartening performances that even in recent years are observed in service pavements. This article deals with a systematization of knowledge, in the form of a written triadic dialogue (as proposed by the Gordon Wells from University of Toronto) between advisor and PhD student, for the exploration of concrete technology in the search for a much more durable CTCS, in an inaugural way nicknamed as High Performance CTCS, or simply HP-CTCS, in opposition to the original mixture. The technological means and fundaments available to obtain mixtures of high strength and durability are presented, commented, and discussed. The article presents an original textual approach on the subject, following the inquire-response-follow up methodology used in the education area. The incorporations of concrete technologies for BGTC mixtures are discussed and explored in view of the expected performance improvements, as well as rationally facing the question of the water/cement ratio in the mixture and its implications, presenting a multiplicative model for analysis of the expectation of gain in resistance required for high quality mixtures preserved the essence of a BGTC for the road engineers.
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