Available online at www.CivileJournal.org Civil Engineering Journal (E-ISSN: 2476-3055; ISSN: 2676-6957) Vol. 8, No. 06, June, 2022 1257 Asphalt Elasticity Modulus Comparison Using Modified Laboratory LWD Against UMMATA Method Lucky Caroles 1* 1 Department of Infrastructure Engineering, Graduate School of Hasanuddin University, Makassar, Indonesia. Received 24 March 2022; Revised 21 May 2022; Accepted 27 May 2022; Published 01 June 2022 Abstract Highway consultants need pavement structure strength to examine and design. With advances in computer, sensor, and microelectronic technologies, the light weight deflectometer (LWD) can measure granular and asphalt layers. This portable, easy-to-use tool is suggested. This article was designed to improve LWD Pusjatan's accuracy and distinguish it from other testing methods. This study compares the LWD Pusjatan and UMMATA (Universal Material Testing Apparatus) methods for measuring modulus of elasticity on different materials. Boussinesq elastic theory is used to compute the modulus of most LWDs. In a semi-elastic environment, modulus is the connection between pressure and displacement in a rigid or flexible basis. The deflection value is derived from the process of vibrations caused by a load delivered from a given height onto a test item, with the wave/vibration collected by an acceleration measuring instrument, such as a geophone or accelerometer. The modulus of elasticity provided by the AUDL (Laboratory Deflection Test Equipment) method is less than that produced by the UMMATA method. According to the test results, the average value of AC Base material is 7.52% less than that of AC Base. The average value of AC BC material is just over 0.3%. These results indicate that more testing is necessary when using the AUDL methodology to detect correlations that might serve as a basis for comparison. Thus, the AUDL test method may be used as a nondestructive testing technique. This kind of non-destructive technique should be used frequently so that simulations of field circumstances are more accurate. Keywords: Asphalt; Elasticity Modulus; Light Weight Deflectometer (LWD); UMMATA. 1. Introduction Highway consultants require the structural strength characteristics of a pavement structure for assessment and management planning. This structural strength criterion is expressed by the value of the California Bearing Ratio (CBR) for unpaved roads such as unpaved roads. The utilization of these methods takes a long time and requires numerous personnel. The Field CBR test, on the other hand, is inappropriate for any soil having particles with a longest dimension of more than 20 mm, since the plunger's sitting on a big stone might provide an inaccurate result. The sand test often yields substantially lower results than the laboratory testing upon which the design charts are based. Nondestructive testing (NDT) techniques may offer all of these characteristics and are particularly suited for use on pavements. Using NDT, many data sets may be collected at the same time, providing statistical dependability for the experimentally collected data. The basic purpose of a structural assessment procedure is to estimate the structural strength [1]. It may be described in terms of in situ layer elastic modulus, layer thickness, inter-layer bond conditions, and anomaly characterization for asphalt pavements. After excavating pits or removing pavement cores, which are disruptive processes, a layer's attributes may be estimated using a straightforward and basic visual assessment. Besides, it does not damage pavement and has a lower cost than destructive testing. It is also faster that from 50 to 60 tests can be done per * Corresponding author: caroleslucky88@gmail.com http://dx.doi.org/10.28991/CEJ-2022-08-06-012 © 2022 by the authors. Licensee C.E.J, Tehran, Iran. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC-BY) license (http://creativecommons.org/licenses/by/4.0/).