1/12/2018 · In the mixing process, the concrete was dry mixed using a mechanical mixer; afterwards, water was added gradually and mixed till the homogenous mix obtained. Powdered rubbers mixed with cement and then with aggregate are finally mixed with water in order to prohibit the low specific gravity powdered rubber initially mixed with aggregate from floating to the top of mixture.
30/10/2020 · The foam concrete's ductility attained an optimal level at the CF content of 1.5%. The dynamic compressive strengths reached their highest values of 2.27 MPa (at 0.20 MPa gas pressure), 3.18 MPa (at 0.25 MPa gas pressure), and 4.21 MPa (at …
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12/5/2020 · The three aspects of stirring quality, energy consumption, and wear loss are quantitatively analyzed. The best installation angle and interval are 31.8° and 30°–34°. This study can provide a reference for the design choice of the installation angle of the mixing blade of concrete mixers.
15/5/2019 · Abstract In order to study the dynamic characteristics of the self-compacting lightweight aggregate concrete (SCLC) under uniaxial compression, 10 different strain rates (10 −5 –10 −1 /s) were set up to examine the uniaxial compressive dynamic performance of ordinary concrete, lightweight aggregate concrete, and SCLC, respectively.
PROPORTION AND EVALUATION OF ULTRA-HIGH PERFORMANCE CONCRETE USING LOCAL MATERIALS Flávia Ribeiro Furtado de Mendonça, M.S. University of Nebraska, 2019 Advisor: Jiong Hu Ultra-high performance concrete (UHPC) is a new class of
3/9/2020 · According to the mixer's cup diameter (65 cm), the considered mixing speeds are equal to 0.733 m/s and 1.4661 m/s. Mixing time Three different times are considered to investigate the mixing time, including 3 min (According to Iran Concrete Commentary (ABA)), 8 min [ 32 ], and 11 min (according to the mixing steps of the mentioned procedures and authors experience).
20/4/2021 · In order to understand the influence of the vibration mixing method on the performance of cement-stabilized aggregate mixture (CSAM), in this study, an unconfined compressive strength test, drying shrinkage test and the influence of gradation characteristics on compressive strength were used to systematically analyze the performance of CSAM based on vibration mixing. At the same time, the
12/5/2020 · The quality of a building desponds directly on the quality of concrete, and mixing is the key process of concrete production. However, a mixing blade is severely worn and has a relatively short life during the mixing process because of severe friction between the concrete material and the double-horizontal shaft mixer stirring blades. This study uses the abrasion mechanism of a mixer and the
When working, the geometric distribution shape of concrete in concrete mixing truck's rotary drum changes continuously, which cause a great difﬁculty for studying the dynamic performance of the mixing drum. In this paper, the mixing system of a certain type of concrete mixing truck is studied.
2003 If at the completion of mixing the concrete mix does not satisfy this from CIV E 101 at University of Notre Dame 2. Production and Material Behaviour of RPC Investigation of Reactive Powder Concrete and it's Damping Characteristics 2-16 When Utilised in Beam Elements 2.2.4 Curing Regime Roy and Gouda (1973) investigated the effects of high temperature and high pressure curing ("Hot
1/4/2014 · 2.2. Mixing and casting The mixing processes for concrete can be described as follows: partial mixture of water and FDN and total sand (30 s), limestone rubble (30 s), cement, fly ash and silica fume (30 s), residual mixture of water and FDN (60 s).After the mixing
The Connecting Method for the Spiral Blades of Concrete Mixer Truck Xinhui LIU, Yanhong SONG, Feng REN*, Jinshi CHEN, Min ZHAO Abstract: For the spiral blade of the concrete mixing tank of concrete mixer truck, in order to satisfy the stirring and discharging performance, the installation angle and helix
By analysing the phase-frequency characteristic of twin-shaft mixer's working system, the dynamic behavior of mixing concrete is defined. When the agitating shaft is frequency-converting drive, the "boiling" movement occurs in concrete, which characteristics are better than that constant speed drive makes and improves the microscopic homogeneity of concrete.
Typically the speed for mixing is 1.57 rad/s (15 rpm) while the transport of pre-mixed concrete uses only 0.2 rad/s (2 rpm) to 0.6 rad/s (6 rpm) . Get Price Automatic drum rotation control concrete transit mixer
8/2/2021 · The binder and stone materials were mixed using an asphalt mixer to ensure even mixing and adherence to the mixing temperature. In the two-phase mixing method, 20% of the bitumen was added to the coarse aggregate and was mixed, followed by the addition of the fine aggregate.
The mixing system of a certain type of concrete mixing truck is studied.A mathematical method for calculating the dynamic performance of the mixing drum is established.Results show that with the increase of rotating speed, the vibration amplitude of the mixing
1/1/2018 · It can be concluded that mixing has a non-negligible role in the performance of macro synthetic fibre reinforced concrete. Prolonged mixing can increase the performance, but too much mixing, however, does however reduce the performance. The optimal mixing time depends on the mixer type as well as the type of fibre.