Lightweight Mortars

The values of the initial shear strength given in Eurocode 6 (2005) depend on the type of unit (clay, calcium silicate, concrete, stone) and on the type of mortar (general-purpose mortar, lightweight mortar, or thin-layer mortar). 

S. Chandra and J. Aavik, Influence of proteins on some properties of portland cement mortar, Int. J. Cement Compos. Lightweight Concrete, 9, 91 94 (1987). 

Masonry blocks of lightweight blast-furnace slag (used as coarse aggregate) are sometimes used. These units are laid-up with thin staggered joints not more than Xin (0.8 cm) thick. Joints should use only fire-resistant mortar. 

Large quantities of zeolite-containing rock is worked in different countries (including the Federal Republic of Germany in the Eifel region) and is utilized in the manufacture of cements, mortars and lightweight building blocks. In Japan, natural zeolites are used as a filler in paper. 

The workability of the fresh mortars and the properties of the hardened mortars are determined by the mix composition (binder, water, traditional aggregate, polymeric granulate, additives) in the same way like in normal lightweight mortar technology. The dense structure of the grains is advantageous as it makes it unnecessary to take into account the water suction of the aggregate. 

Table 4 gives an example for a lightweight outdoor plaster mortar made with polymer waste granulate. 

Up till now there is only few safe knowledge about stress-induced deformations (E-modulus, creep) and stress-independent deformations (shrinkage, swelling, temperature-expansion). But due to long experiences with other mortars containing polymers (e.g. lightweight mortars with expanded polystyrene as aggregate, polymer modified cement mortars PCC), basic problems are not to be expected. 

Keywords Differential movement, fall-off of exterior ceramic tile, honeycomb shaped woven net, polymer modified lightweight cement mortar, two dimensional finite element method, woven fiber net... 

Polymer modified lightweight cement mortar (PLCM) with plastics waste as aggregate is widely used as substrate mortar layer on the reinforced concrete wall for external ceramic wall tile installations instead of the ordinary cement mortar conventionally used. The reasons that this mortar is popularly used in building site are it s own lightweight and excellent workability for troweling. 

Plastics wastes used as aggregate of the mortar are expanded polystyrene (PS) and expanded ethylene-vinyl acetate copolymer (EVAc). Expanded PS is obtained from packing materials wastes and so on. Now, about 9,200 tons of expanded PS have been crushed and used as lightweight aggregate for plastering materials every year in Japan. EVAc chip is found in cushion materials for shoes etc. These plastics wastes are crushed and graded for the purpose. This mortar was developed about 20 years ago. The suitable application of this mortar has been discussed and studied until now. 

LIGHTWEIGHT CEMENT MORTAR USING PLASTIC WASTE 63... 

Three types of lightweight aggregate chosen in the market were used. Type A is composed of crushed expanded polystyrene (3mm under in size), EVAc chips (3mm under in size) and methyl cellulose etc. This mortar using type A is mainly applied to internal wall with the thickness of 2 10mm. 

Polymer modified lightweight cement mortar A Cement (kg) B Water (kg) C Polymer dispersion (kg) Lightweight aggregate (kg)... 

Polymer modified lightweight cement mortar Age (days) ... 

Polymer modified lightweight cement mortar Specific gravity Bending strength (MPa) Compressive strength (MPa) modulus Elastic (GPa)... 

PREPARATION AND PROPERTIES OF LIGHTWEIGHT HIGH-STRENGTH MORTARS CONTAINING FRP FINE POWDER AS... 

Keywords FRP fine powder, recyclization, lightweight mortar, strengthening... 

In result, considerably lightweight FRP mortar with high strength (No.3) was obtained only by high temperature curing and pressurization. When the substitution rate of silica fume for cement was raised from 0.1 to 0.3, bulk density decresed and compressive strength incresed, while deflection showed a tendency to decrease. 

Although this investigation was preliminary, the Bureau of Mines has, nevertheless, demonstrated two new potential uses for sulfur—a mortar to produce prefabricated brick panels and a foamed lightweight... 

M. Neelamegam, Y. Ohama, K. Demura, S. Suzuki and A. Shirai Flexural behavior of poly-mer-ferrocements with various polymer mortars as matrices. The International Journal of Cement Composites and Lightweight Concrete Vol.6, No.3 (1984), pp.151-157. 

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