zainab sadoon ali alnumairi

Polymer-modified concrete and mortars are widely used with different purposes in precast concrete and prestressed concrete structural elements, bridge decks, buildings, and repair requirements because of their significant behavior under different conditions, such as durability against freezing and thawing, ability to absorb impact loads and good mechanical properties compared to ordinary concretes. This study aims to improve some mechanical properties of cement mortar by using styrene–butadiene rubber (SBR) latex, a superplasticizer, and also decreasing the absorption level to lower values by using these two admixtures. The study shows that using 10% SBR by weight of cement increases the compressive strength from 28.6 to 30.8 MPa and decreases the absorption from 2.3 to 1.7% which gives durability for cement mortar. This study also shows the development in strength achieved by using SBR superplasticizer simultaneously, and absorption decreases to only 0.76% for 10% SBR mixes. In comparison, it was 1.75% for mixes with SBR only

Wall piles supported with anchors are considered one of the most prevalent types of engineering support. This research includes studying the behavior of wall piles through a numerical parametric study using the FE-method program (PLAXIS 2D). The study includes the most influencing factors such as the angle of the inclination, the vertical spacing between the rows of anchors, and the distance of the first row of anchors from the ground surface. The effects of these factors on the stability of the wall were studied. Optimal positioning of the anchors is crucial, as it maximizes their effectiveness and contributes significantly to reducing the overall construction costs. The use of a guys queue for the economic aspect saves the cost of executing two guys queue because the effect of having two rows does not significantly change the transfer values. The optimum angle of inclination of the tensioner row is 15° in favor of safety, and as it gives good stability of the wall to the wedge wall, with an increase in this angle, the horizontal movement decreases. The first optimum dimension for a row of guys from the horizontal surface of the earth is O = 25%H. Decrease the values of horizontal movement of the wall by increasing the angle of friction.