The Effect Of Adding Silica Gel Particles On The Mechanical Properties Of Portland Cement
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The modern concrete nowadays are subjected to many additions, some are natural, and other are chemicals. The concrete without additions became a classic concrete and often it does not fulfill the required purposes, such as durability, permanence and some other mechanical proprieties when it is on hard status. Several attempts have been used, trying the additions with the concrete mix. Any addition has to be examined practically and scientifically to know how much effective these additives on the concrete mix. This research examines the effect of adding Silica gel particles with different percentage (1, 2, 4, 6, 8 and 10% ) on thefailure stress of the concrete. Two types of reinforcements were studied.The first new mix uses sand with silica particles that were added to cement. The new first mix had negative effects on the mechanical properties on its hardened status according to design a concrete mix method. The concrete specimens failed at lower stresses as compared to the unreinforced specimens. This can be explained by the fact that adding silica gel particles with sand to the cement did not allow for the complete onto the hydration process, which is necessary for the cement hardening steps. However, very different effects were observed on the new second concrete mix, where the mechanical properties were improved. Itwas found that adding silica gel particles (without sand) to the cement has a positive effects on the mechanical properties of cement. The cement specimens that were reinforced with (silica) failed at higher stresses as compared to the unreinforced specimens with average value of 10.2 MPa. The maximum failure stress of the new concrete has increased to reach 18, 18 and 17.5 MPa when 2, 4 and 6 % silica particles were added respectively. This means that the hydration process was complete and had not been affected by the addition of silica particles. This was the case for the addition of up to 8 % silica particles to the cement. This led to higher hardening rate and higher strength concrete.
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