Roller compacted concrete (RCC) is a technology characterized mainly use of roller for compaction. This construction method permits considerable reduction in costs and construction time of dams and roads. The main aim of this work is to investigate the influence of compaction methods on the properties of RCC. the experimental program included preparing cylindrical specimens with (diameter of 150 mm by height of 300 mm) for measuring the compressive strength, splitting tensile strength and absorption. And it also includes prism specimens with (100*100*400) mm for measuring the modulus of rupture. These specimens were compacted by using different compaction methods, dynamicly (modified proctor hammer compaction (CBR test), vibrator table, and vibrator table with CBR test) and statically (compacting pressure (compacting pressure 10 MPa, 15 MPa and 20 MPa). Results show that the compaction methods have a noticeable effect on the properties of RCC. The results also indicated that using vibrator table with CBR show an increase in the compressive strength, splitting tensile strength and modulus of rupture by 23%, 14% and 13%, respectively as compared with compacted by vibrator table only. The results also show that using compacting pressure 20 MPa show an increase in the compressive strength, splitting tensile strength and modulus of rupture by 31%, 27%, and 39%, respectively as compared with that made by compacting pressure 10 MPa.

As a result of the development in Iraq and the reconstruction of the different buildings, there are construction residues that be assembled in a randomized area of cities where these residues occupy a large area of residential or agricultural areas and pose a danger to the environment and humans, so there has become pressing need to study the environmental impact of construction waste materials and how to recycle and use them in the construction industry in a manner that helps to preserve the environment from pollution and conservation of its natural resources. This investigation includes the production of high performance lightweight concrete sustainable building units containing crushed brick clay resulting from the demolition waste and reconstructive of buildings and manufacture artificial aggregate from waste materials, as coarse lightweight aggregate. These units are features by thermal insulation and lightweight, in addition they are an environmental friendly have low price, which can be used in the implementation of low cost buildings. Two High performance lightweight aggregate concrete mixes were produced, the first concrete mix containing crushed clay brick (mix MBR), and the second concrete mix containing artificial LWA (mix MAR) as coarse LWA. These concrete mixes were used to produce concrete masonry unites (CMUs). High performance lightweight concrete mix containing crushed brick clay has oven dried density of 1930 kg / m 3 , thermal conductivity of 1.0849 W / (m. K), and compressive strength of 41 N/ mm 2 , while concrete mix containing artificial aggregate has oven dried density of 1828 kg/m 3 , thermal conductivity of 0.9278 W/(m.K), and compressive strength of 47 N/mm 2. Two geometrical forms of CMUs with dimensions of 200×200×400 mm were produced, the first one contains spaces less than 25% and the other geometric form contains polystyrene insulation materials. Numerous laboratory tests were carried out on the produced CMUs including, water absorption, density, and compressive strength. The results indicate that these units conforms Iraqi standard requirements No.1077\1987.

The main aim of this research is to study the effect of using the additive materials (hydrated lime and metakaolin) on the behavior of roller compacted concrete. The experimental work includes several trial mixes to choose the most suitable roller compacted concrete mix in terms of physical concrete properties. The first step is to specify the optimum cement and water content which is designed in laboratory using 300 kg/m 3 of cement and 0.5 W/C ratio while the second step the only variation is using the optimum sand content of 700 kg/m 3 and the third step the variation is using the optimum percentage of the additive materials (metakaolin and hydrated lime) at percentages (5%, 10%, 15%, 20% and 25%) as a partial replacement by weight of cement, the optimum percentage of 15% of (HL and MK) as a partial replacement of cement at different ages. The research also includes studying the physical properties (compressive strength, splitting tensile strength and flexural strength) of specimens with additive materials and without additive materials. Also the results of RCC specimens with additive materials (MK and HL) show improvement in compressive strength, splittingtensile andflexural strength (modulus of rupture) compared with the specimen without additive materials.