Matofali haya yanatumia udongo na saruji katika utengenezaji wake ndio maana yanaitwa matofali ya udongo saruji. udongo wa aina zote unaweza kutumika kutengeneza matofali haya, lakini udongo unaofaa zaidi ni ule wenye kiasi cha mfinyanzi kati ya 10% hadi 40%. Udongo ukiwa na kiasi cha mfinyanzi chini ya 10% udongo huo haufai kutengeneza matofali haya kwani mnato unakuwa mdogo hivyo tofali halitashikamana, kutokana na aina ya mashine zinazotumika  tofali halitaweza kubebeka kutoka katika mashine kwa kuwa mashine inayotumika kutengeneza haitumii vibao kwa ajili ya kubebea. Kiasi cha mfinyanzi kikizidi 40% udongo huo unafaa kuchanganywa na saruji ila hushauriwi kufanya hivyo kwa sababu kiasi cha saruji kinachotumika ni kikubwa hivyo kukuongezea gharama za utengenezaji wa matofali hayo, tofali litanywea baada ya kukauka, hivyo kupasuka kwa sababu ya mfinyanzi kuwa mwingi, pia udongo huo hauwezi kuchanganyika vizuri na saruji kwa kutumia chepe kwa sababu ya mnato mkali au udongo wenye kiasi cha mfinyanzi zaidi ya asilimia arobaini unaweza kupiga matofali bila ya kuchanganya na saruji ila italazimika kuyachoma matofali hayo ili yawe imara zaidi.

Ili kujua kiasi cha mfinyanzi kilichopo katika udongo ili kujua kiasi cha saruji kinachohitajika katika kuchanganya na udongo wakati wa kutengeneza matofali yanayofungamana kuna majaribio yanayofanyika ili kuweza kujua hayo yote. majaribio hayo ni:

  1. jaribio la chupa (bottle test)
  2. jaribio la kasha (shrinkage box test)


Jaribio hili hutumika kupima kiasi cha mfinyanzi kilichopo katika udongo unaotaka kuutumia,Udongo unaotumika ni udongo wa chini udongo wa juu ni lazima uondolewe kwani ni udongo wenye mbolea na mizizi haufai kwa shughuli za ujenzi, udongo unaofaa ni ule wa chini hivyo ni lazima kuhakikisha kuwa udongo wote wenye mizizi na mbolea uneondolewa.


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